HyQuest Solutions WDC100 User manual

HyQuest Solutions Pty Ltd
WirelessDataCollector Issue1.7
© Copyright 1 of 33 3 Nov, 2014
INSTRUCTION MANUAL
WIRELESS DATA COLLECTOR
MODEL WDC100
HYQUEST SOLUTIONS PTY LTD
PO BOX 332, LIVERPOOL B.C NSW 1871, AUSTRALIA
Phone:(Int.) 612 9601 2022 Fax: :(Int.) 612 9602 6971
Phone:(Nat.) [phone] Fax: :(Nat.) [phone]
Email: [e-mail]
Web: www.h
yq
uestsolutions.com.au
QUALITY SYSTEM
ISO:9001
CERTIFIED

HyQuest Solutions Pty Ltd
WirelessDataCollector Issue1.7
© Copyright 2 of 33 3 Nov, 2014
TABLE OF CONTENTS
1.Product Overview.............................................................................. 4
2.Installation.......................................................................................... 5
2.1Planning your System.......................................................................................... 5
2.2Hardware Connections (Transmitter)............................................................... 8
2.3Hardware Connections (Receiver)..................................................................... 10
2.4Antenna Mounting............................................................................................... 11
2.5Power Supply ....................................................................................................... 11
2.6Menu Navigation ................................................................................................. 12
2.7Configuration....................................................................................................... 13
3.Operation............................................................................................ 15
3.1Transmitter LED................................................................................................. 15
3.2Displaying Water Volume................................................................................... 16
4.Specification ....................................................................................... 17
4.1Hardware Specification....................................................................................... 17
Appendix A Creating the Level to Volume Formula ................................... 18
Appendix B Creating the Level to Volume Mapping................................... 21
Appendix C Buoy Breather Bag Setup.......................................................... 24
Appendix D Sending Custom SDI-12 Commands........................................ 27

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WirelessDataCollector Issue1.7
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Latest Changes in Transmitter Software Rev 1.3 (7-Dec-2011)
-Should only be used with Receiver S/W Rev 1.3
-Perform Battery Charging control by switching solar to battery
-Allow the monitoring of SDI-12 data through the aM1, aM2, aM3….. aM9 commands
(Previously, only the aM! Command could be used)
Latest Changes in Transmitter Software Rev 1.4 (28-Mar-2013)
-Restart the RF module if no comms in 2.5 secs - and restart entire Transmitter if no comms in 10 mins
-Added a LED flash sequence on startup
-Got the sleep working much better + goes to sleep if there is no comms - only wakes up for 7 secs
every minute to check for comms again
-Saves the TipTotal accumulator if it is going to do a forced "no comms" reset
-Changed the RF freq steps to 3MHz. Range is now 904.5MHz to 925.5MHz
Latest Changes in Transmitter Software Rev 1.5 (3-Jul-2014)
-Allow Custom commands to be sent to SDI-12 devices
Latest Changes in Receiver Software Rev 1.3 (7-Dec-2011)
-Allow the configuration of SDI-12 data using the aM1, aM2, aM3….. aM9 commands
-LCD backlight now stays on for 30 secs but LCD itself stays on for 4 mins
-Allow the Volume to be calculated from the 4-20mA input or the SDI-12 input #1
-Allow an Offset to be added to SDI-12 input #1
Latest Changes in Receiver Software Rev 1.4 (27-Apr-2012)
-Changed the Volume calculation from a 4th order polynomial to a 10 point linear interpolation.
-Allow the Level to Volume configuration to be performed in a Windows App “OutpostConfig”
Latest Changes in Receiver Software Rev 1.5 (28-Mar-2013)
-If no comms at all for about 20 mins, power down the RF module for 0.4Secs, and power it up again.
-Measure and display the Rx Signal strength eg: Coms: OK-5 Range is 1 to 7
-If changing the Preset Tip count, keep sending it until message gets through (prev S/W Revisions only
sent it once)
-Changed the RF freq steps to 3MHz. Range is now 904.5MHz to 925.5MHz
Latest Changes in Receiver Software Rev 1.6 (29-Jan-2014)
-Can now select which Transmitter the Receiver’s digital output is driven from.
-Clock out the tips from the Receiver digital output at 2 tips per second.
-New configuration screen to enable/disable each transmitter individually – rather than using the rotary
switch. The Receiver SDI-12 only responds to configured Transmitters.
-If the SDI-12 #1 Offset is not used, then meas #1 is fed through as for other measurements #2 - #9
Latest Changes in Receiver Software Rev 1.7 (3-Jul-2014)
-Allow Custom commands to be sent to SDI-12 devices on any Transmitter. This is used in conjunction
with “Outpost Express” Windows application.
Latest Changes in Receiver Software Rev 1.8 (16-Jul-2014)
-Bug fix – Volume to level table now saved to non-volatile memory after updating from Windows App.
Latest Changes in Receiver Software Rev 1.9 (24-Oct-2014)
-Sets the SDI-12 Meas #1 value to 999.999 if comms to remote Transmitter is lost for 2 consecutive
polls.

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WirelessDataCollector Issue1.7
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1. Product Overview
The HyQuest Solutions Wireless Data Collector WDC100 has been designed using surface
mount technology to provide a very small, ultra low power wireless SDI-12 and 4-20mA
transmitter / SDI-12 receiver network that can be used in harsh environments for extended
periods. The Wireless Data Collector’s primary purpose is to
periodically measure various signals at remote
locations, including a 4-20mA transducer, up to 9 x
SDI-12 data variables and a digital contact closure
(rainfall or flow meter input) and to wirelessly transmit
the data to a central location and make the data available
to a data logger via an SDI-12 interface. A central
receiver can collect data from up to 8 separate
transmitters, each with a very low power consumption
(typically 200uA while asleep) which makes it ideal for
remote sites where long battery life is important. The
receiver also has an LCD + keys to display the data and
set configuration parameters. A new feature allows
custom SDI-12 commands to be sent to any remote
Transmitter SDI-12 sensor (See Appendix D)
“OutPost”
WDC100 Receiver
4-20mA
Transducer
12V Battery
+ -
Looks like
many SDI-12
Sensors to the
Data Lo
gg
e
r
SDI-12 Data
Logger
TBRG
Digital I/P
4-20mA
Transducer
“OutPost”
WDC100 Transmitter
12V Battery
+ -
TBRG
Digital I/P
Measures up to
9 x SDI-12
Data Variables
1km range
Please Note : Even though we refer
to the OutPost as either a Transmitter
or a Receiver, each unit is actually a
transceiver that both receives and
transmits data !!

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2. Installation
2.1 Planning your System
This is an important step, so you must make sure your system can achieve exactly what you
require. The receiver collects data from up to 8 transmitters and has a line of sight range of up
to 1km. This will be reduced by obstacles including, trees, fences, buildings, vehicles,
electricity wires, hills etc. The SDI-12 data logger will be located at the receiver.
1. Select a frequency the system will operate at, and set each transmitter and the receiver
to the selected frequency. If the system is in a remote location, then the frequency of
operation is not important, however, if the system is located close to other equipment
operating in the 915MHz band, then you may need to try different frequencies until
you find one that doesn’t clash. You could have several WDC100 OutPost “Systems”
operating in close proximity to each other, on different frequencies. Also note that the
HyQuest Solutions’ Hornet, Flying Fox and Cable Fox river gauging products also
use this frequency band!!! (The next chapter shows the switch used to set the
transmitter and receiver frequency.)
2. The transmitters must all have a unique address between 0 and 7. (Receiver software
Rev 1.5 and below requires the transmitter address to start at 0 and increase up to 7.
Receiver software Rev 1.6 and above allows the transmitters address to be non-
sequential.)
3. Configure the transmitters you will be polling from the “My Config” menu – in
Receiver S/W Rev 1.6 and above. (If you have Receiver software Rev 1.5 and below
then consider upgrading it – or use the Operators Manual Issue 1.3)
4. Decide what sensors you are going to fit to each transmitter, and what data you are
going to log. Each transmitter can have a combination of the sensors below.
Sample : Sensors connected to Transmitter #0 :
Input Input Type Used
Yes/No Description Other Info : 4-20 Range, SDI Addr/Meas, SDI Data Pt#
Battery Voltage Yes Tx #0 BV
4-20mA Yes INW PS98i 10m Range
Volume Calc Yes Tank Volume 4-20 Level Vol table
Digital Input No
SDI #1 Yes INW PT12 Level Addr 1, Meas 5, Data Pt 1
SDI #2 Yes INW PT12 WTemp Addr 1, Meas 5, Data Pt 2
SDI #3 Yes INW PT12 ATemp Addr 1, Meas 5, Data Pt 3
SDI #4 Yes AD375A Depth (m) Addr 3, Data Point 1
SDI #5 No
SDI #6 No
SDI #7 No
SDI #8 No
SDI #9 No

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5. Make sure your SDI-12 Logger can log all the variables you require! All of the data
returned from Transmitter #0 will be translated to appear as data from SDI-12 address
#0. All the data returned from Transmitter #1 will be translated to appear as data from
SDI-12 address #1. ………All the data measured by the receiver itself will be
translated to appear as data from SDI-12 address #8.
The above translation is as follows :
(Sensor connected to Tx#0 Meas#1,#2,#3 is from the example on the previous page)
Sensor Connected to
Transmitter : SDI-12 Addr/Data requested by Logger
Unit Description SDI-12
Addr/Meas SDI-12 Data Pt SDI-12 Addr SDI-12 Data Pt
Tx#0 Battery Voltage - - 0M! 1
4-20mA Water Level - -
0M! 2
Volume Calc from 4-20mA WL - - 0M! 3
Digital Input accumulator - - 0M! 4
Last Measurement (hhmmss) - - 0M! 5
SDI-12 Measurement #1 eg. 1M5! 1 0M! 6
SDI-12 Measurement #2 eg. 1M5! 2 0M! 7
SDI-12 Measurement #3 eg. 1M5! 3 0M! 8
SDI-12 Measurement #4 eg. 3M! 1 0M! 9
SDI-12 Measurement #5 0M1! 1
SDI-12 Measurement #6 0M1! 2
SDI-12 Measurement #7 0M1! 3
SDI-12 Measurement #8 0M1! 4
SDI-12 Measurement #9 0M1! 5
Tx#1 Battery Voltage - - 1M! 1
4-20mA Water Level - -
1M! 2
Volume Calc from 4-20mA WL - - 1M! 3
Digital Input accumulator - - 1M! 4
Last Measurement (hhmmss) - - 1M! 5
SDI-12 Measurement #1 eg. 0M! 1 1M! 6
SDI-12 Measurement #2 1M! 7
SDI-12 Measurement #3 1M! 8
SDI-12 Measurement #4 1M! 9
SDI-12 Measurement #5 1M1! 1
SDI-12 Measurement #6 1M1! 2
SDI-12 Measurement #7 1M1! 3
SDI-12 Measurement #8 1M1! 4
SDI-12 Measurement #9 1M1! 5
Tx#2, #3, ……., #7 same as above
Rx Battery Voltage - - 8M! 1
4-20mA Water Level - - 8M! 2
Volume Calc from 4-20mA WL - - 8M! 3
Digital Input accumulator - - 8M! 4

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Think of the Outpost Transmitter as a data collector – grabbing data from different
sensors with varying SDI-12 address, and putting the data in the Outpost Receiver so the
Data Logger can retrieve it any time it likes.
The Data Logger will always see the data collected by Transmitter #0 as SDI-12 address
#0, and it will see the data collected by Transmitter #1 as SDI-12 address #1,….
ExampleSystem
Tx#0 Batt V 0M! Data Pt 1
Tx#0 Calc Vol 0M! Data Pt 3
Tx#0 1M5! -1 Water Lvl 0M! Data Pt 6
Tx#0 1M5! -2 Wtr Temp 0M! Data Pt 7
Tx#0 1M5! -3 Air Temp 0M! Data Pt 8
Tx#0 3M! -1 Water Lvl 0M! Data Pt 9
Tx #1 Batt V 1M! Data Pt 1
Tx #1 0M! -1 Water Lvl 1M! Data Pt 6
SDI-12
Addr 1 Meas 5
Data Pts 1,2,3
“OutPost”
WDC100 Tx #0
12V Battery
+ -
SDI-12
Addr 3
3M!
SDI-12
Addr 0
Data Pt 1
“OutPost”
WDC100 Tx #1
12V Battery
+ -
“OutPost”
WDC100 Receiver
SDI-12 Data
Logger
Data table
held by
Receive
r
Retrieves Data
via SD-12
comman
d

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12V Battery +
12V Battery - Aerial
WDC100
Transmitter
4-20mA Transducer +
4-20mA Transducer -
Configuration
DIP Switches :
Status LED (under cables)
Digital Input +
Digital Input -
Switch contact input.
Eg. Tipping Bucket
Rain Gauge, Flow
Meter
,
…
Address 0 to 7 (S2)
RF Frequency (S1)
SDI-12 Data
SDI-12 Power
SDI-12 Gnd
LK1 Out => 30mA
In => 130mA
2.2 Hardware Connections (Transmitter)
The WDC100 Transmitter can monitor 1 x 4-20mA signal + up to 9 x SDI-12 parameters (in
a single transducer or scattered over 9 x transducers) + a digital input from say a TBRG rain
gauge or a water flow meter + the battery voltage powering the transmitter itself.
The terminals are screwless, simply push the wire into terminal hole – you may need to
depress the orange release lever if fine wire is used. This lever should be depressed to remove
the wire.
Rotary Switch S1 sets the RF transmission
frequency as follows :
(Mar-2013)
Up to Tx S/W Rev1.3 Tx S/W Rev1.4 up
0 916.5MHz 0 904.5MHz
1 917.5MHz 1 907.5MHz
2 918.5MHz 2 910.5MHz
3 919.5MHz 3 913.5MHz
4 920.5MHz 4 916.5MHz
5 921.5MHz 5 919.5MHz
6 922.5MHz 6 922.5MHz
7 923.5MHz 7 925.5MHz
Rotary Switch S2 sets the WDC100 Transmitter
address from 0 and 7.
NOTE : All other configuration settings are
passed to the Transmitter from the central
controller !!!
The SDI-12 Power signal AND the 4-20mA
Transducer + signal are connected together on the
PCB, and are switched 12V power. The combined
current through these 2 terminals is current limited to
30mA when Jumper LK1 is “out” and current limited
to 130mA when jumper LK1 is “in”.
When an SDI-12 measurement is required, the 12V
power is switched to the SDI-12 Power signal for 2
seconds before the SDI-12 data commands are
transmitted. If the SDI-12 transducer requires a
constant 12V supply, then connect the SDI-12 device
power to the Battery+ signal instead of using the SDI-
12 Power terminal.
When a 4-20mA measurement is required, the 12V
power is switched to the “4-20mA Transducer +”
signal and left for the programmed “Warm Up”
period before a measurement is taken.

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4-20mA Transducer
SDI-12 Transducers
On Off On
Transducer Power
(Transducer +)
Warm Up
1,2,…,20 Secs
Warm Up
Sample
1 Sec Sample
1 Sec
Poll Time
(Transmission Interval)
0,1,5,10,15,30,60 Mins
(0 mins continuous)
(no off time)
Comms Rx
Data Re
p
l
y
The Transmitter predicts when
a poll will be received, and
takes the 4-20mA sample, so it
is ready for the received poll.
On Off On
SDI-12 Power
2 Secs
Sensor 0 : Meas + Data
Sensor 1 : Meas + Data
Sensor X : Meas + Data
: : : :
The transmitter predicts when
a poll will be received, and
takes the SDI-12 samples, so it
is ready for the received poll.
The time it takes to measure the SDI-12 samples depends upon the
SDI-12 transducers used! The transmitter measures and saves away
this time so it can predict when to start future samples.

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12V Battery +
12V Battery -
Aerial
WDC100
Receiver
4-20mA Transducer +
4-20mA Transducer -
Configuration
DIP Switches :
Status LED
Digital Input +
Digital Input -
Switch contact input.
Eg. Tipping Bucket
Rain Gauge, Flow
Meter,…
Address : Not Used
RF Frequency (S1)
SDI-12 Data
Do not use !!
SDI-12 Gnd
LK1 Out => 30mA
(Curr limit on 4-20mA)
2.3 Hardware Connections (Receiver)
The WDC100 Receiver collects data from up to 8 x WDC100 Transmitters and it can also
monitor 1 x 4-20mA signal + a digital input from say a TBRG rain gauge or a water flow
meter + the battery voltage powering the receiver itself.
The terminals are screwless, simply push the wire into terminal hole – you may need to
depress the orange release lever if fine wire is used. This lever should be depressed to remove
the wire.
Rotary Switch S1 sets the RF transmission
frequency as follows :
(Mar-2013)
Up to Rx S/W Rev1.4 Rx S/W Rev1.5 up
0 916.5MHz 0 904.5MHz
1 917.5MHz 1 907.5MHz
2 918.5MHz 2 910.5MHz
3 919.5MHz 3 913.5MHz
4 920.5MHz 4 916.5MHz
5 921.5MHz 5 919.5MHz
6 922.5MHz 6 922.5MHz
7 923.5MHz 7 925.5MHz
NOTE : Each transmitter and receiver must
be set to the same frequency setting.
Rotary Switch S2 sets the last WDC100
Transmitter that will be polled. Eg. If this switch
is set to say 3, then the receiver will poll
addresses #0, #1, #2 and #3
NOTE : All other configuration settings are
set from the LCD and 4 buttons.
The “4-20mA Transducer +” is a switched 12V power
signal and is current limited to 30mA when Jumper
LK1 is “out”. When a 4-20mA measurement is
required, the 12V power is switched to the “4-20mA
Transducer +” signal and left for the programmed
“Warm Up” period before a measurement is taken.
The SDI-12 Data and SDI-12 Gnd signals should be
connected to the SDI-12 Data Logger. The WDC-100
Receiver will look like many different SDI-12 sensors.
NOTE :
Transmitter #0 will appear as SDI-12 Sensor address 0,
Transmitter #1 will appear as SDI-12 Sensor address 1,
…..(up to Transmitter #7), and the WDC100
Receiver will appear as SDI-12 Sensor address 8)

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2.4 Antenna Mounting
Both the transmitter and receiver are supplied with a ground plane independent antenna that
have 1.5dB gain. (The mounting thread of the antenna is connected to the battery –ve input.)
The antenna is mounted by :
Hold the antenna coax cable firmly (1) and unscrew the antenna body (2).
Remove the nut and washer from the antenna body and put onto the coax cable.
Drill a 10mm mounting hole.
Insert the coax cable through the mount hole – from the inside of the enclosure.
Screw the antenna body back onto the coax cable – screw all the way in.
Insert the antenna into the mounting hole and slide the washer and nut onto the
antenna body and tighten the nut.
2.5 Power Supply
The Wireless Level Transmitter requires a 12V power source, such as a 7Ah lead acid
battery. The transmitter has 4 basic states as shown :
Transmitter Current Consumption
Sleep 0.20mA
Warm Up (4-20mA) 10mA + measured 4-20mA
SDI-12 Measure 10mA + SDI-12 sensor power
Waiting for RF Comms 20mA
Sending RF Reply (120mS) 80mA
The Wireless Level Receiver also requires a 12V power source, such as a 7Ah lead acid
battery. The receiver has 6 states as shown :
Receiver Current Consumption
LCD and backlight (B/L) off 20mA
LCD and B/L off + Warm Up (4-20mA) 20mA + measured 4-20mA
LCD and B/L off + Transmitting RF (50mS) 80mA
LCD and B/L on 60mA
LCD and B/L on + Warm Up (4-20mA) 60mA + measured 4-20mA
LCD and B/L on + Transmitting RF (50mS) 120mA
(1) Hold here !
(2) Rotate the
antenna body
Mostly
in this
state !
Mostly
in this
state !

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2.6 Menu Navigation
Info about System Info about Tx’er #0
Set to 999.999 if
comms is lost
To
other
Tx’ers
To
highest
number
Tx’ers More status
of Tx’er #0
Enter PIN before Config can be
changed.
Default PIN is 001
PIN can be set in “My Config”
(If PIN is set to 000 in My Config,
then no PIN entry is required !!)
Show more
Status of
Tx’er #0
Show
Status of
receive
r
Display
Big Digits
Correct PIN
entere
d
Arrow indicates
config parameter
to be changed
Step Down through
config paramters to be
changed. (As shown on
the next page)
More
My Status

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2.7 Configuration
The configuration of all Transmitters is performed through the receiver LCD and buttons, and
then sent to the transmitter during the next poll sequence.
Both the Receiver and each Transmitter must be configured separately.
Receiver Configuration “My Config”
Select Big Values to be displayed
Configure 4-20mA input.
Enable, warmup period,
transducer range, set
transducer level from gauge
plate, set units, zero the offset.
Set polling interval
0Min continuous
(
for testin
g)
Configure Digital Input or
Output and which Tx operates it.
Input : increment for each event,
preset starting level, set units.
Configure Volume calculation
from 4-20mA water level. (Also
allows Decimal Point (DP) or
No Decimal Point (NDP)),
set units.
Define the 10 point linear
interpolation table.
Arrow indicates
p
osition to chan
g
e
Set the new PIN number (when set
to “000, PIN entry is disabled)
Configure which of the
Transmitters 0 to 7 are
Enabled / Disabled.

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Transmitter Configuration
Up to 9 x SDI-12 data inputs can be monitored by each OutPost Transmitter. These data
points may be within the same SDI-12 address, or they may be split up over several SDI-12
addresses.
Example :
Data Input #1 may be from SDI-12 Address 1 Measurement 5 Data Point 1
Data Input #2 may be from SDI-12 Address 1 Measurement 5 Data Point 2
Data Input #3 may be from SDI-12 Address 3 Measurement Data Point 1
:
Select Big Values
to be dis
p
la
y
e
d
Configure 4-20mA input.
Enable, warmup period,
transducer range, set
transducer level from gauge
plate, set units, zero the offset.
Set polling interval
0Min continuous
(
for testin
g)
Configure Digital Input.
Enable, increment for each event,
preset starting level, set units.
Configure Volume calculation
from 4-20mA water level or
SDI-12 input #1, (DP=Decimal
Place, NDP=No Decimal
Places) set units, define points
#0 to #9 for linear interpolation
table.
Configure SDI-12 devices that
are monitored.
Arrow indicates
p
osition to chan
g
e
Number of SDI-12 data points to
be monitored
An offset may be added to SDI-12
input #1 only. This Config screen
shows the Raw Data, the Offset to
be added and the final Adjusted
Data. Press “Chg” to edit the
o
ff
se
t
.

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3. Operation
Polling vs Power Consumption
When a Transmitter is set to poll continuously, it will continuously take measurements from
any sensors connected, and the receiver will poll it continuously. In this mode the Transmitter
will never go to sleep, and will consume the maximum power. It is recommended that this
mode be used when testing the OutPost System.
When the OutPost Transmitter is to be put into service, set the specific Transmitter Poll time
to 1min, 5min, 10min, 15min, 30min or 60min. When the Transmitter is in between polling, it
goes to sleep and consumes 0.2mA. This is the preferred mode of operation.
If the poll time is set to a period greater than 1 minute, the transmitter will still wake up every
minute and respond to a Receiver poll, so that the Transmitter and Receiver stay in synch.
The Transmitter will not take a measurement during these synch polls.
When the Transmitter goes to sleep, it continually monitors the time, and knows when the
Receiver is going to poll it for the next sensor data. The Transmitter also knows how long it
will take to gather data from the sensors, and it therefore wakes up prior to the poll, takes the
sensor measurements just in time for the poll from the Receiver.
3.1 Transmitter LED
LED Description
Flashes every 1 secs Transmitter is asleep
Bright Flash Transmitting result
Battery Indicator :
Empty if BV < 11V
Full if BV > 13.5V
(If Tx is selected, then
indicator shows
voltage of that Tx’er)
Status of each Transmitter :
Tick Tx’er comms is OK
Cross Tx’er comms fault
Dash Tx’er not configured
Transmitter being
polled 0 to 7 Aerial symbol means Transmitter responded

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Level
Volume
3.2 Displaying Water Volume
The WDC100 has the facility to display the water volume (of a reservoir) as a function of the
4-20mA water level (Receiver S/W Rev 1.2 and below). In S/W Rev 1.3 the water volume
could also be calculated from the SDI-12 #1 variable. Some customers had problems getting a
4th order polynomial to fit their data points, so a new method was introduced in S/W Rev 1.4
See Appendix A for details on how to derive the appropriate polynomial type equations and
hence the terms of the 4th order polynomial Poly0 thru to Poly4. (See Appendix B for the
method to do a 10 point linear interpolation level to volume mapping.)
4th Order Polynomial – (S/W Rev 1.3 and lower) - See Appendix A
The formula generated in the example is :
Water Volume = 0.8065 x4- 18.957 x3+ 165.76 x2- 19.588 x + 0.000
(where x is the water depth in metres)
For this example, the polynomial terms entered into the WDC100 are as follows :
(Please note the sign of each term !!!!!)
Poly0 = 0.000 ( term for x0, which is the intercept )
Poly1 = - 19.588 ( term for x1, which is just x )
Poly2 = 165.760 ( term for x2)
Poly3 = - 18.957 ( term for x3)
Poly4 = 0.8065 ( term for x4)
The Volume display option must first be enabled, so the Poly0 to Poly4 configuration
appears.
10 Point Linear Interpolation – (S/W Rev 1.4 and higher) - See Appendix B
This is the method used in all
new products supplied. This
Level to Volume mapping can
be made to fit any relationship.
By using the “Set Level” menu item, you can preset various levels and hence check the Water
Volume. As the water level now changes between 0.000m and 10.000m the water volume of
the reservoir will be displayed.
PLEASE NOTE : The water volume is not exact, but it is a very good approximation.

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4. Specification
4.1 Hardware Specification
Transmitter 4-20mA Input 16 bit resolution : 8 samples over 1 sec
Transmitter Inputs 1 x 4-20mA : 1 x Digital Input : 9 x SDI-12 inputs :
Volume Calculated from 4-20mA or SDI-12 #1Water Level
Battery Voltage
Receiver Inputs 1 x 4-20mA : 1 x Digital Input : Battery Voltage :
Volume Calculated from 4-20mA Water Level Only
Indicators WDC100 Transmitter - Status LED indicator
WDC100 Receiver – 128 x 64 Graphics LCD
Controls WDC100 Receiver – 4 x Pushbuttons
Connections Screwless Terminals
Radio Frequency 916.5 to 923.5MHz (in 1MHz steps) Prior to Mar 2013
904.5 to 925.5MHz (in 3MHz steps) Mar-2013 Onwards
Transmit Power 10mW
Range 1km (0.62 miles) line of sight
Dimensions 125mm x 80mm x 57mm (L x W x D)

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Appendix A Creating the Level to Volume Formula
The WDC100 has the facility to display the water volume (of a reservoir) as a function of the
water level. The function originally implemented was a 4th order polynomial. (Receiver S/W
Rev 1.3 and lower) This method is kept here for completeness - some customers had
problems getting the polynomial to fit their set of points, so a different method has been
introduced in Receiver S/W Rev 1.4 April 2012) and above – See Appendix B.
This appendix shows how to generate the formula from a “level : volume” data table.
After a site survey, a table of data equating
water level (in metres) to water volume (in
mega-litres) should be entered into an Excel
spreadsheet as shown
(The water volume units can also be entered into
the WDC100. eg kL Kilolitres or ML 
MegaLitres)
Select the data, then click on the “Chart Wizard”
or select the menu item “Insert – Chart”.
Click on XY (Scatter) and click finish.
This will automatically create a graph of points
relating water level (x axis) to the water volume
(y-axis).
Position and size the graph on the spreadsheet
page.

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Click on one of the graph points, then
right click and select “Add trendline…”
Click on Polynomial and increase
“Order” to 4 (to create a 4th order
polynomial)
Click on the “Options” tab.
Select “Set intercept =” and then enter
the water volume when the water level is
0.00m
Select “Display equation on chart”
Click OK

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The line drawn on the chart is the 4th order polynomial. You should get a good idea of how
well the formula fits the tabled data.
The formula generated in this case is :
Water Volume = 0.8065 x4- 18.957 x3+ 165.76 x2- 19.588 x + 0.000
(where x is the water depth in metres)
For this example, the polynomial terms entered into the WDC100 are as follows :
(Please note the sign of each term !!!!!)
Poly0 = 0.000 ( term for x0, which is the intercept )
Poly1 = - 19.588 ( term for x1, which is just x )
Poly2 = 165.760 ( term for x2)
Poly3 = - 18.957 ( term for x3)
Poly4 = 0.8065 ( term for x4)
As the water level now changes between 0.000m and 10.000m the water volume of the
reservoir will be displayed.
PLEASE NOTE : The water volume created from this 4th order polynomial is not exact, but
it is a very good approximation.
Level
Volume