WaveFlow module - Technical Specifications

Transkript

File : CS-SUP-MUTI-WFLOWSPETEC-E02.sxw
WaveFlow module technical specifications.
page 1 of 31
LIST OF UPDATES
Update #
Description
Author
Date
Comments
1
First edition
RCS
22/11/04
Version 1
2
Update supported
meters
RCS
08/07/2005
Version 2
REFERENCE DOCUMENTS
Ref
DR[1]
Title
Reference
Version
Date
WaveCard user handbook
page 2 of 31
TABLE OF CONTENTS
1 PRESENTATION OF THE WAVEFLOW MODULE .....................................................................................4
1.1 CHARACTERISTICS..............................................................................................................................4
1.2 METER INTERFACE..............................................................................................................................5
1.3 ELECTRICAL INTERFACE.....................................................................................................................6
1.3.1 Input pulse and anti-bounce filter characteristics ........................................................................... 7
1.3.2 List of pulse emitter types used:......................................................................................................8
1.3.3 Notion of pulse weight......................................................................................................................8
1.4 CODING OF THE WAVEFLOW MODULE RADIO ADDRESS ............................................................9
1.5 WAVEFLOW MODULE OPERATING LIFE .........................................................................................10
2 INSTALLATION OF A WAVEFLOW MODULE ..........................................................................................11
2.1 MODULE FASTENING..........................................................................................................................11
2.2 INSTALLATION PRECAUTIONS.........................................................................................................12
2.3 INITIALISATION OF WAVEFLOW INDEX...........................................................................................13
3 DATA EXCHANGE PRINCIPLE WITH A WAVEFLOW MODULE .............................................................14
4 WAVEFLOW MODULE FUNCTIONS .........................................................................................................15
4.1 PERIODIC INDEX READING (DATALOGGING)................................................................................15
4.2 METER READING................................................................................................................................16
4.3 AUTOMATIC TRANSMISSION OF FAULTS OR FLOW PROBLEMS...............................................16
4.3.1 Alarm management parameter setting.........................................................................................16
4.3.2 Triggering an alarm frame............................................................................................................17
4.4 WAKE-UP SYSTEM MANAGEMENT..................................................................................................17
4.4.1 Choice of wake-up mode..............................................................................................................17
4.4.2 Set a new wake-up period............................................................................................................19
4.4.3 Set a fixed wake-up period for certain days of the week..............................................................19
4.4.4 Set the day/night system parameter without distinction of days of the week............................... 19
4.4.5 Set the day/night system parameter according to day of the week..............................................20
4.5 LEAK DETECTION MANAGEMENT...................................................................................................21
4.5.1 Detection of a residual leak..........................................................................................................21
4.5.2 Detection of an extreme leak........................................................................................................22
4.6 SIMPLE WATER BACK-FLOW DETECTION MODEL.......................................................................23
4.6.1 Simple water back-flow detection principle...................................................................................23
4.6.2 Example of simple water back-flow detection...............................................................................23
4.7 ADVANCED WATER BACK-FLOW DETECTION MODEL................................................................24
4.7.1 Water back-flow detection method with measurement of water volume...................................... 24
4.7.2 Example of water back-flow detection with measurement of water volume.................................25
4.7.3 Water back-flow detection method with measurement of water flow-rate ...................................25
4.7.4 Example of water back-flow detection with measurement of water flow-rate ..............................26
4.8 REED FAULT DETECTION (IF ACCEPTED BY THE MODULE)......................................................27
4.9 CABLE BREAK DETECTION .............................................................................................................27
4.10 END OF BATTERY LIFE DETECTION...............................................................................................27
APPENDIX – A :METERS ACCEPTED AND ASSOCIATED SENSORS........................................................28
APPENDIX – B : PHYSICAL DIMENSIONS (PCB).........................................................................................29
APPENDIX – C : UNIT DIAGRAM....................................................................................................................30
page 3 of 31
1 PRESENTATION OF THE WAVEFLOW MODULE
WaveFlow refers to a range of wireless remote monitoring devices used for pulse reading of fluid
meters (water, gas, electricity, heat,...).
These products are based on Wavenis®
Ultra Low Power radio technology
and offer several years of autonomous battery operation to provide wireless
coverage of difficult access zones. Wireless communication with these modules is
possible with a mobile data collection unit and a fixed radio network.
1.1 CHARACTERISTICS
➢ Technical characteristics
•
LOS radio range up to 1 km.
ISM bandwidth 433 / 868 / 915 Mhz with fixed frequency or frequency hopping.
Digital frequency modulation (GFSK)
Communication speed: up to 9.6 Kbits/ sec.
Maximum metering frequency: 2 Hz.
Receiver sensitivity: -110dBm (BER = 1%, 9.6 kps)
Transmission power 8 dBi with internal aerial.
•
Uses the secure communication protocol
•
CE approval: EN 300-683
ART certification: EN 300-220-1
•
•
•
•
•
•
•
WAVENIS®
Attention: WaveFlow modules do not interfere with other electronic (fixed or wireless) systems
installed close by.
Furthermore, based on our present knowledge, it represents no health risk whatsoever for
persons working occasionally or regularly within the operating radius.
➢ Physical characteristics
•
Protection index:
IP65: totally protected against dust and water spray and splashing from all
directions.
IP68 : totally protected against dust and prolonged immersion under certain
conditions.
•
Operating temperature range: [-20°C ; +70°C]
Dimensions (H/W/D) : 12 x 4 x 3 cm
Weight: 110g to 160g
A diagram indicating the physical size of the unit is provided in appendix C.
•
•
•
page 4 of 31
1.2 METER INTERFACE
The WaveFlow module manages up to 4 pulse metering inputs.
The module is generally delivered pre-wired by Coronis-Systems with the associated pulse emitter (see photo
below); or delivered with the wires disconnected ready for connection to a pulse emitter via a 3M Scotch Lock
type connector.
WaveFlow wired to a CYBLE pulse emitter
In certain cases, the WaveFlow may be delivered unwired or in the form of card without box (see appendix
B).
Each meter input may have up to 3 wires, a pulse wire, a cable break detection wire (optional) and a ground
wire.
pulse
ground
cable break
detection
pulse
Input A
pulse
ground
Input B
ground
cable break
detection
cable break
detection
pulse
Input C
ground
cable break
detection
Input D
WaveFlow Module
page 5 of 31
The WaveFlow module is installed by connecting the pulse emitter to the meter.
In general, the type of pulse emitter used has been specified and the latter is pre-wired to the WaveFlow
module. However, when required by the customer, the WaveFlow modules may be delivered unwired and the
user is then responsible for connection to the pulse emitter.
In this case, the WaveFlow module is delivered with a 3-wire cable for each input (maximum 4 cables).
The cables are connected to the pulse emitters as follows:
Pulse signal
(yellow wire)
Input A
Cable break
(red wire)
GND
(black wire)
Once the pulse emitter has been connected, it is simply connected to the meter and the WaveFlow index
initialised.
➢ Layout of connection terminals to meter (PCB):
J2.........Pulse A
J3.........Cable break A
J4........GND
J8.........Pulse C
J9.........Cable break C
J10.......GND
J5.........Pulse B
J6.........Cable break B
J7.........GND
J11.......Pulse D
J12.......Cable break D
J13.......GND
The inputs are of the open collector or dry contact type (reed contact).
1.3 ELECTRICAL INTERFACE
The characteristics of the metering inputs connected to the module must be in compliance with the following
specifications:
Parameter
Metering frequency
Pulse duration
Conditions
Mini.
Typical
Vdc = 2.5 / 2.8 V
Temperature range = -20°C to 70°C
32
Capacitive charge of sensor
Max.
Unit
4
Hz
64ms
ms
10
nF
Input voltage low (VIL)
0
0,4
V
Input voltage high (VIH)
0.8 x Vdc
Vdc
V
page 6 of 31
1.3.1 Input pulse and anti-bounce filter characteristics
The module is equipped with an anti-bounce filtering system to eliminate glitches during transition which
otherwise provoke an over-count. When this system is enabled, all pulse signals of less than 64 ms are
not detected.
On the other hand, when this filter system is disabled, it is possible to measure pulse signals as short as
32ms (this filter function is enabled or disabled in the factory and must be specified in the order).
Consequently, this requires a maximum pulse input frequency above which the WaveFlow may undercount
the pulse signals. This maximum frequency depends on the following criteria:

Cyclic ratio of the input signal. In reality, the duration of a pulse signal status is rarely the same as
that of the 'rest' status of the pulse emitter.

Use of a double-reed pulse emitter. If the meter allows, the double-reed pulse emitter provides
data relative to water flow direction in the pipeline. The same pulse is detected by two reeds, but
with an offset (positive or negative) indicating the flow direction.
This process requires an offset duration greater than 64ms, in order for the WaveFlow to detect it
(see diagram below).
page 7 of 31
Taking into account the criteria indicated above, the maximum impulse signal frequency
is defined as follows:


Use of a double-reed pulse emitter:
• Anti-bounce filter enabled:
• Anti-bounce filter disabled:
Maximum frequency of 2 Hz,
Maximum frequency of 4 Hz.
Use of a pulse emitter with a single pulse signal:
• Anti-bounce filter enabled:
Maximum frequency of 4 Hz,
• Anti-bounce filter disabled:
Maximum frequency of 8 Hz.
1.3.2 List of pulse emitter types used:
The list of meter/pulse emitter pairs accepted is available in appendix A.
 REED
 Transistor NPN (open collector)
 Field-effect transistor (open drain)
 and, in general, all types of dry-contact pulse emitters.
1.3.3 Notion of pulse weight
The higher the flow-rate in the pipe, the closer the pulse frequency will be to the maximum frequency. To
counter this effect, a pulse emitter with a pulse weight expressed in litres is placed between the meter and
the WaveFlow module (indicated with the letter K).
This weight depends directly on the sensor (pulse emitter) used and may not be modified.
In general, the pulse weight may have any of the following values 0.5 ; 1 ; 2.5 ; 10 ; 100 ; and 1,000
(depending on the pulse emitter manufacturer).
With this weight, it is possible to meter high flow-rates while keeping the metering frequency below the critical
threshold.
Attention : Once the sensor pulse weight has been established, the WaveFlow pulse weight
parameter must be set in accordance with this sensor.
The pulse weight is given as an example only and is not used by the application.
The maximum flow-rates for the various pulse weights are indicated below for a maximum frequency of 4 Hz:
Weight
Qmax
1 litre
14.4 m3/h
10 litres
144 m3/h
100 litres
1,440 m3/h
page 8 of 31
1.4 CODING OF THE WAVEFLOW MODULE RADIO ADDRESS
A barcode label is applied to each module, indicating the WaveFlow module radio address. This address may
be given in two forms:
•
either with direct display of the radio address: 12 digits indicating the hexadecimal radio address
of the module;
•
or in the form of a serial number: in this case, the radio address is coded in the first 15 digits of
the serial number; the other digits represent the CRC (algorithm available on request – contact
[email protected]).
To find the radio address in a serial number, proceed as follows:
➢ Based on the serial number: The radio address (hexadecimal) is compiled as follows.
Address indicated on the barcode (without CRC): 00278-04-03153276
The chain of characters is split into 3 sections (as indicated below)
00278
04
03153276
Conversion
Decimal to Hexadecimal
(on 2 bytes)
Conversion
(on 1 byte)
Conversion
(on 3 bytes)
0116
04
301D7C
A combination of these 3 parts provides the radio address (hexadecimal) of the module: 011604301D7C
page 9 of 31
1.5 WAVEFLOW MODULE OPERATING LIFE
The operating life of a module is based on the average current under various operating conditions. The
operating life is first of all based on typical operating conditions for which the battery manufacturer is able to
guarantee the useful life.
This is then reduced according to operation of the WaveFlow module close to its tolerance limits.
The operating life of the module depends on the following parameters:
Battery capacity,
Battery cut-out voltage,
Module power consumption during stand-by (microprocessor in stand-by mode),
Module wake-up period,
Number of unnecessary wake-ups (caused by radio data exchanges between modules within the
range of the WaveFlow module),
Number of pollings by the host module,
Operating climatic conditions.







Based on the aforementioned parameters, the Coronis test laboratory establishes the average module power
consumption. Under normal operating conditions, this value is less than 20 µA.
➢ Climate diagram (percentage of time spent at a given temperature)
Outdoor
Indoor
Duration
(%)
Duration
(%)
30 %
30 %
25 %
25 %
20 %
20 %
15 %
15 %
10 %
10 %
5%
5%
-20 -10
0
20
40
50
60
Temperature (°C)
0
10
20
30
40
50
Temperature (°C)
Bearing in mind the number of parameters which could have an influence on the battery operating life in
particular climatic conditions (see operating climatic diagram above), but also parameter settings and
operating frequency, Coronis-Systems is not able to guarantee a precise operating duration for the batteries
in your module.
However, as an example, under the specific climatic conditions indicated above and with an average module
power consumption of less than 20µA; the battery will have a minimum operating life of 14 years.
➢ Auto-adaptation of the detection threshold
The WaveFlow modules constantly adjust the detection levels for wake up periods according to the
environment. This helps guarantee the operating life-span even in the presence of disturbances and
interference.
page 10 of 31
2 INSTALLATION OF A WAVEFLOW MODULE
2.1 MODULE FASTENING
The modules may be fastened in various ways:
➢ Screw fastened
Two diagonally opposed holes enable easy screw fastening of the module to a flat surface.
Two diagonally opposed holes enable easy screw
fastening of the module to a flat surface.
➢ Fastened with a plastic strap
The specially designed casing of the WaveFlow module may be fastened to a pipe (the rear surface of the
module is vertically curved) and secured with clamping or fastening straps (a horizontal guide is incorporated
in the front surface for this purpose).
➢ Fastened with a clamping ring associated with a meter
For certain types of meters specific plastic fastening rings have been developed as indicated below:
page 11 of 31
2.2 INSTALLATION PRECAUTIONS
To ensure optimum operation, both from a battery as well as a radio frequency emission point of view, it is
recommendable to fasten the WaveFlow module vertically with the aerial pointing up and to ensure a
minimum distance of 20 cm between two modules.
It is also recommendable to install the modules, whenever possible, far away from metal surfaces and
electrical cables.
➢ Example of installation in a manhole:
When installed in a manhole, the radio transmission range of the modules is reduced. In order to limit this
loss, it is important to place the modules as high as possible while retaining a distance of at least ten
centimetres to the cast iron lid.
page 12 of 31
2.3 INITIALISATION OF WAVEFLOW INDEX
The WaveFlow measures and counts the pulse signals transmitted by the pulse emitter. The relationship
between the meter index reading in the volume unit (litre, for example) and the number of pulse signals
counted must be established.
Example : meter reading indicates 1,000 l.
- if the pulse emitter has a value of k = 0.1 (1 pulse/decilitre)
10,000 pulses represents 1,000 litres, the value to be entered in the WaveFlow index will be
10,000.
- if the pulse emitter has a value of k = 1 (1 pulse/litre)
The number of pulses represents directly the volume measured and therefore the value to be
entered in the WaveFlow index will be 1,000.
- if the pulse emitter has a value of k = 10 (1 pulse/decalitre)
100 pulses represents 1,000 litres, the value to be entered in the WaveFlow index will be 100.
- if the pulse emitter has a value of k = 100 (1 pulse/hectolitre)
10 pulses represents 1,000 litres, the value to be entered in the WaveFlow index will be 10.
The WaveFlow module may be polled in order to know the pulse weight of the meter connected to it. The
module contains specific parameters for each metering input indicating the corresponding pulse weight.
These parameters are for information only and and are not used by the WaveFlow application.
These parameters must be configured at the same time as the WaveFlow index is initialised in accordance
with the pulse emitter weight. Refer to the WaveFlow modules application handbook for details of commands.
page 13 of 31
3 DATA EXCHANGE PRINCIPLE WITH A WAVEFLOW MODULE
The WaveFlow module uses the
WAVENIS® protocol
The choice of mode used is initiated by the read element which uses a different set of commands (see
WaveCard document) when sending commands to the WaveCard.
The following chart indicates the read modes possible as well as their typical applications.
Read mode
Description
Recommendations
peer-to-peer
Individual reading with re-transmission management
in case of no reply
Standard use
Polling
This mode enables successive polling of several
modules in a single operation .
The principle consists of waking up several modules
with the 1st radio transmission.
To be used when module reading time is
an important factor.
Re-transmission not possible.
Broadcast and multicast (*)
This mode enables use of a single frame to address
all radio modules within reception range.
The multicast mode may only address one group of
modules.
This mode enables reading of modules
without knowing their radio address.
Type of use: detection of radio modules
within range of the emitter module
(installation phases).
➢ Additional functions:
Additional
functions
Repeater
Compatibility
Description
Recommendations
Only used in peerto-peer mode.
This function enables use of a radio module to relay
a frame which was not initially intended for this
module.
This function is used when the caller
module and the target Waveflow
module are outside radio range.
This is a default function of the WaveFlow module
i.e. it may be read via several repeaters but may
also act as a repeater itself when reading another
unit.
The maximum number of repeaters is
limited to 3.
Remark:
- The broadcast and multicast modes are not used as standard on the WaveFlow module
(only on request).
- When used in Polling mode, it is possible to assign a group number to the WaveFlow module
with a radio parameter setting.
It is then possible to access all modules with the same group number via the read commands.
page 14 of 31
4 WAVEFLOW MODULE FUNCTIONS
The WaveFlow modules offer the following functions:



Read index immediately,
Read logged index values.
Log and automatically transmit alarm or occurrence signals:
• leaks
• extreme flow
• cable break
• end of battery life
• water back-flow


Operating mode management (including clock synchronisation)
Read internal parameters (firmware version, radio communication mode,...)
This mode is used to log up to 24 index values with looping when the table is full; this mode provides access
to the last 24 index values logged.
4.1 PERIODIC INDEX READING (DATALOGGING)
The Datalogging mode enables periodic logging of meter index values at each input. The frequency of these
readings may be set in three modes:

index logging in time steps
This type of datalogging is used to log the index value for each input at periods ranging from one
minute to over thirty hours. The time of the first logging may be set with a parameter.
When the datalogging mode in time steps is enabled, the system only logs the memorised index
values as soon as the preset time is attained; and this until the datalogging mode is disabled.

index logging once a week
This type of datalogging is used to log the index value for each input once a week. The time and day
of the week logging is carried out may be set with a parameter.

index logging once a month
This type of datalogging is used to log the index value for each input once a month. The time and day
(from 1 to 28) logging is carried out may be set with a parameter.
The system does not manage changes in the number of days in a month (the days 29, 30, and 31
are not used).
Example: when monthly logging is selected, the meter readings for the previous month on all
inputs is read on the 1st of the month at 00:00 h.
page 15 of 31
4.2 METER READING
The WaveFlow modules offer the possibility to:
 read the true value of water meters on inputs A and B. In the case of WaveFlow modules
managing water back-flow, this back-flow value is subtracted from the effective water
consumption.

transmit the last 24 values memorised
4.3 AUTOMATIC TRANSMISSION OF FAULTS OR FLOW PROBLEMS
The WaveFlow module offers the possibility to automatically transmit radio frames when an occurrence is
detected.
The following occurrences may provoke an automatic alarm:
Residual leak detection
Extreme leak detection
 Water back-flow detection


Cable break detection
 Reed fault detection
(if this function is available on the meter/pulse emitter
pair)


(if this function is available on the meter/pulse emitter
pair)
End of battery life detection
It is possible to select for each type of occurrence whether or not an alarm frame is to be sent.
The radio address of the receiver module and the repeater path must be preset with a radio signal.
4.3.1 Alarm management parameter setting
The alarm frame transmission parameters are set in two steps,

Configuration of the alarm frames receiver module (as well as the repeater path if applicable).
This setting is carried out by accessing the parameters concerned, but may also be carried out
automatically.
Therefore, when a remote module of the type WaveCard/WavePort transmits an alarm configuration
command; the WaveFlow module retrieves the address of the remote module and repeater path (if
used) and memorises them as receiver of alarm frames.

Enable alarms with the alarm management parameter
Alarm frame management configuration is achieved with specific radio commands. Following an
alarm configuration command, the WaveFlow module returns an acknowledgement of reception.
In the case of an error, or a non-conform request, the acknowledgement frame contains a write
status byte. Otherwise it returns control, index and input bytes.
page 16 of 31
4.3.2 Triggering an alarm frame
After detection of a fault, if the configuration mode authorises transmission of alarms, the module transmits
an alarm frame.
Attention, an alarm frame only has one type of detection. When several alarms are detected, the
WaveFlow module emits the frames one after the other.
An alarm frame will be transmitted after the previous frame has been acknowledged.
The remote device must send an acknowledgement frame to confirm reception of the alarm frame and end
dialogue.
If the WaveFlow module does not receive this acknowledgment, it re-transmits the alarm frame a set number
of times (variable depending on the type of module).
4.4 WAKE-UP SYSTEM MANAGEMENT
In order to reduce module power consumption, a wake-up period parameter setting system is incorporated.
This system enables modification of the module wake-up period (default setting 1 s) by entering a time and
day of the week :

The wake-up period default value may be modified;

Two time-windows with different wake-up periods may be defined;

Each day of the week may be set in one of the following three cases :
•
•
•
Wake-up period default setting
Wake-up according to predefined time windows
No wake-up period (for safety reasons, the module is not disabled on reception and it
wakes up every 10 seconds)
The system is disabled by default and must be enabled with a radio signal.
4.4.1 Choice of wake-up mode
These modes are directly dependent on the 'wake-up system status word' configuration and the values of
parameters associated with each mode.
Wake-up mode
Case n°1 : Periodic wake-up, without distinction of day of the week (paragraph 4.4.2)
Case n°2 : Periodic wake-up in specific time windows for certain days of the week, periodic wake-up for the other days
(paragraph 4.4.5)
Case n°3 : Periodic wake-up for certain days of the week, periodic wake-up disabled for the other days paragraph 4.4.3)
Case n°4 : Periodic wake-up in specific time windows for certain days of the week, periodic wake-up for some days and
periodic wake-up disabled for the remaining days (paragraph 4.4.5)
Remark: before enabling a specific wake-up mode, the parameters associated with this mode must
first be set
page 17 of 31
➢ Example of different wake-up modes:
Case n°1 :
Periodic wake-up, without distinction of day of the week
Case n°2 :
Periodic wake-up in time windows from Monday to Friday.
Standard periodic wake-up for the other days.
Case n°3 :
Periodic wake-up from Monday to Friday.
Wake-up disabled the other days.
page 18 of 31
Case n°4 :
Periodic wake-up in time windows from Monday to Friday.
Standard periodic wake-up on Saturday.
Wake-up disabled on Sunday.
4.4.2 Set a new wake-up period
The WaveFlow module wake-up default setting is every second. The wake-up period may be easily modified
by entering a new value in the “default wake-up period parameter”.
Attention, the value associated with this parameter may not exceed 10 seconds.
4.4.3 Set a fixed wake-up period for certain days of the week
The wake-up system parameters may be set to allow disabling of WaveFlow module periodic wake-up for
certain days of the week.
In practice, when periodic wake-up is disabled, the WaveFlow polls every 10 seconds.
The parameter setting procedure is as follows:
 disable periodic wake-up for certain days, with the 'Enable periodic wake-up for certain days of
the week' parameter.

Enable selection of the days of the week, with the 'wake-up system status word' parameter;
'wake-up system status word' = 0x02
In this way, on days when periodic wake-up is disabled, the module polls every 10 seconds; whereas for the
rest of the week the module wakes up at the default period setting.
4.4.4 Set the day/night system parameter without distinction of days of the week
The wake-up system parameters may be set to enable configuration of the time windows with different wakeup periods.
The time windows function as follows:

Set the start time for the first time window and its wake-up period;

Set the start time for the second time window and its wake-up period;

Select the days of the week during which the time windows are enabled;

Validate the time window mode with the 'wake-up system status word'.
page 19 of 31
4.4.5 Set the day/night system parameter according to day of the week
The day/night system according to the day of the week parameter setting procedure is the same as that
described in the previous chapter with the exception that the “Enable time window according to the day of the
week” parameter is only set for days required.
For example, we wish to enable the time window from Monday to Wednesday.
The 'Enable time windows according to day of the week' parameter is set to 0x07.
In this way, the module wakes up during these time windows for a period set in the associated parameters
with a specific start time for each window from Monday to Wednesday.
For the other days of the week, the wake-up mode depends on the 'wake-up system status word' :

the rest of the week, the module uses the default wake-up period.

periodic wake-up disabled (polling every 10 sec.)
page 20 of 31
4.5 LEAK DETECTION MANAGEMENT
The WaveFlow module detects two types of leaks for each metering input, residual leaks and extreme leaks.
For each of these types of leaks, the module carries out the following operations:
• Leak detection
• Date of leak detection recording
• Recording of detection date and min. (or max.) flow-rate.
If the leak stops:
• Date
• Recording of the leak stoppage date and last flow-rate detected
This data is stored in a circular buffer which may be accessed by radio and contains the last 5 events logged
(occurrence or stoppage of leaks).
The module may be programmed to generate an automatic radio frame when a leak is detected.
The leak detection parameters are programmed individually for each pulse input.
4.5.1 Detection of a residual leak
Detection is enabled when the module detects that the instantaneous flow-rate (normally calculated every
hour) is systematically higher than that set by the user for a given detection period.

Leakage flow-rate: Detection threshold.

Leak detection period: minimum time during which the threshold value must be exceeded before
leak detection is validated.
➢ Example: The measurement value is set (see chapter 1.2) to measure the flow-rate in liters/hour and the
residual leakage detection parameter is then set as follows:


Leakage flow-rate: 5 liters/h
Detection period: 4 days.
See diagram on the next page.
page 21 of 31
Flow-rate in liters/hour
Detection period: 4 days
10
Leakage threshold
Days
Passage above
threshold value
Residual leak
detection
Remark: It is recommendable to use a detection period of several days (or even a week) to avoid untimely
alarms caused by occasional leaks due to errors.
Common leakage rates are:
–
–
–
4 litre/h (35 m3/year) for a dripping tap,
16 litre/h (140 m3/year) for a water trickle,
40 litre/h (350 m3/year) for a leaking toilet flush.
4.5.2 Detection of an extreme leak
Detection is enabled when the module detects a flow-rate higher than that set by the user in the extreme leak
parameter for a given detection period.
➢ Extreme leak flow-rate: Detection threshold.
➢ Extreme leak detection period: minimum time during which the threshold value must be exceeded
before leak detection is validated.
page 22 of 31
4.6 SIMPLE WATER BACK-FLOW DETECTION MODEL
The WaveFlow module is able to detect back-flow consumption for which the critical flow-rate threshold
parameter may be set. When this flow-rate is attained within a given period, a fault detection signal for the
current month is transmitted in a status byte.
In this case, only the water back-flow occurrences for the current month are saved together with the effective
back-flow value.
Water back-flow detection is enabled by default.
4.6.1 Simple water back-flow detection principle
Water back-flow is measured periodically according to a predefined detection period (expressed in hours).
A point T is given for each measurement; the module calculates the flow-rate according to the values
detected at the T points (T-1).
This water back-flow rate is processed and, if it exceeds the predefined back-flow threshold, water flow is
signalled in a detection status byte and the month this back-flow occurred is memorised in a specific byte.
4.6.2 Example of simple water back-flow detection
The measurement value is set (see chapter 1.2) to measure the water volume in litres and the water backflow parameter is then set as follows:
➢ Detection period: measurement in litres/hour,
➢ Detection threshold: threshold set to 16 litres/hour.
During each detection period, the module measures the flow-rate for the previous period in litres/ hour (see
illustration on next page).
Water back-flow volume in
litres
5
t
Back-flow rate in
litres/hour
Detection period
1 hour
Detection
threshold
5
t
-5
Water back-flow
detection
page 23 of 31
4.7 ADVANCED WATER BACK-FLOW DETECTION MODEL
The WaveFlow module is able to detect back-flow consumption for which the critical flow-rate threshold
parameter may be set. Two detection methods are available for this purpose and may be selected by writing
a configuration parameter.
The module carries out the following operations for both methods:

Water back-flow detection,
• for the first method, the back-flow is detected as soon as the WaveFlow module
measures a continuous water back-flow volume higher than the set threshold value; the
water volume measured in the positive direction is deducted from the back-flow taken
into account.
•
for the second method, the water back-flow is detected as soon as the WaveFlow
module measures a continuous water back-flow rate higher than the set threshold value.

Date of 'water back-flow' occurrence,

Duration, or end of occurrence:
• Date of end of 'back-flow' occurrence for the first method;
• Log occurrence duration for the second method.
This data is stored in a circular buffer which may be accessed by radio and contains the last 4 occurrences
logged.
The module may be programmed to generate an automatic radio frame when back-flow is detected.
The water back-flow detection parameters are programmed individually for each pulse input.
4.7.1 Water back-flow detection method with measurement of water volume
With this method, the water back-flow volume is measured using a preset measurement unit. The water
volume measured in the positive flow direction (not the back-flow water) is subtracted from the water backflow volume.
Water back-flow is measured as soon as it occurs, but the occurrence is only logged when the water backflow volume exceeds a preset threshold value.
The table is updated during the entire back-flow duration and the maximum water volume recorded is saved
as well as the date of end of detection.
End of detection takes place when the water back-flow volume becomes stable.
➢ Parameters:

Detection threshold: this is the water back-flow volume which triggers logging of the occurrence.

Detection period: this period indicates the water back-flow volume measurement granularity.
This value is set at 1 minute and may not be modified.
Attention: do not confuse this fixed detection period with the flow-rate detection method for which the
parameters may be modified.
page 24 of 31
4.7.2 Example of water back-flow detection with measurement of water volume
4.7.3 Water back-flow detection method with measurement of water flow-rate
With this method, the water back-flow rate is measured during a predefined detection period.
The detection period is divided into 10 measurement steps. At each step, the average flow-rate for the
previous measurement period is calculated (or the last 10 measurement steps).
This system enables detection of very short flow peaks which would be missed with other measurement
methods. It also enables conservation of a low measurement granularity while expressing the flow-rate in
number of pulses per measurement period.
Back-flow is detected when the flow rate exceeds a preset threshold value. The occurrence is then logged in
a table. The table is updated during the entire water back-flow period in order to log the maximum back-flow
rate detected and the end of detection date.
End of detection takes place as soon as the water back-flow rate returns below the preset threshold value.
➢ Parameters:

Detection threshold: this is the water back-flow rate which triggers detection and logging of the
occurrence.

Detection period: this period is expressed in 10-minute steps. It is used to set the measurement
granularity; in this way, a detection period is sub-divided into 10 measurement steps.
Consequently, the minimum measurement step is 1 minute.
page 25 of 31
4.7.4 Example of water back-flow detection with measurement of water flow-rate
The measurement weight is set (see chapter 6.1.5) to measure the water volume in litres and the associated
back-flow parameters are set as follows:
➢ Detection period: if a measurement scale in litres/hour is required; the parameter is
simply set to a value of 6.
➢ Detection threshold: the threshold is set to 16 litres/hour
At each measurement step (a tenth of the detection period), the flow-rate is measured for the previous
detection period; in this way the flow-rate in litres/hour is obtained for each measurement step.
Water back-flow volume in litres
5
t
Back-flow rate in
litres/hour
Maximum flowrate
Detection period = 60 min.
Detection threshold
5
t
-5
Detection duration
Date of end of detection
Water back-flow duration
page 26 of 31
4.8 REED FAULT DETECTION
•
(IF ACCEPTED BY THE MODULE)
Reed fault detection principle.
A reed fault is detected when the pulse transmitted by the second reed of the pulse emitter is not detected
after several attempts.
Once a reed fault has been detected, it is transmitted with the corresponding input in a status byte and the
date the reed fault is detected is memorised.
Reed fault detection is normally disabled but may be enabled with a radio parameter setting signal in an
operating mode byte.
4.9 CABLE BREAK DETECTION
•
Cable break detection principle.
Cable break fault detection is possible if the cable sensor is of the 3-wire type.
In such a case, the 3rd wire is connected to a module input in the same way as the metering input.
Periodically, the software detects a cable break by measuring the level on this input.
Once a cable break fault has been detected, it is transmitted in a status byte and the date the cable break
fault is detected is memorised.
Cable break fault detection is normally enabled but may be disabled with a radio parameter setting signal in
an operating mode byte.
4.10 END OF BATTERY LIFE DETECTION
To detect the end of battery life, the WaveFlow module uses the power metering principle rather than
measurement of the battery voltage. Lithium batteries are, in particular during passivation, unsuitable for the
voltage measurement method to determine the remaining capacity.
The WaveFlow records and evaluates all occurrences (measurements, transmissions) to decrement the
power meter according to the battery used. When the meter passes below a predefined threshold, the “end of
battery life” is signalled with the STATUS byte.
The initial value of the end-of-life meter is factory-set. It depends on the type and number of batteries used.
When the end of battery life is detected, the detection date is memorised and may be read with a radio
command
page 27 of 31
APPENDIX – A :METERS ACCEPTED AND ASSOCIATED SENSORS
This list may be updated. Contact us for details of new meters accepted.
Brand
Sensor
Meter
ABB
ELSTER 'T-Probe' sensor
ABB meter
ACTARIS
CYBLE
AQUAMASTER flow meter
Aquadis
Flodis
Flostar M
Woltex M
Sensor S
Flostar M
Woltex
-
ELSTER
ELSTER 'T-Probe' sensor
ACE1000 SM0
PSM
V200
PG100
ENDRESS + HAUSER
IBERCONTA
METER KSS-BV14682
AMCO M150 (sensor incorporated)
S2000
PROMAG50 flow meter
S130
M150
SAPPEL
PULSAR
Véga
ALTAÏR
Aquarius
Gemma
Aquila
Wesan
SOCAM
SENSUS
INVENSYS
WATEAU
HRI
620
610
RD01
WSD150
RE
DNN
Marly II
Marly II
M3
-
ZENNER
Type Reed-pulser
Supercal 539
MNK-N
WPH
ET-N/MTK-N 2R
ETK-N-0311015
page 28 of 31
APPENDIX – B : PHYSICAL DIMENSIONS (PCB)
page 29 of 31
APPENDIX – C : UNIT DIAGRAM
page 30 of 31
page 31 of 31

WaveFlow module - Technical Specifications

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