HyQuest Solutions WL3100 User manual

WL3100
User Manual

© 2022 HyQuest Solutions 2
Table of Contents
I Disclaimer 3
II Safety Instructions 4
Part I Introduction 5
Part II Installation 6
2.1 Wiring Details ................................................................................................................................................... 7
2.1.1 Screwless Terminals ................................................................................................................................. 7
2.1.2 External Power ........................................................................................................................................... 7
2.2 Field Setup Procedure .................................................................................................................................... 8
Part III External Power 9
Part IV Configuration 10
Part V Operation 11
5.1 LCD Screen ...................................................................................................................................................... 11
5.1.1 Sampling Mode – Single, Continuous, Averaging .......................................................................... 13
5.1.2 RS 232/SDI-12 Selection ..................................................................................................................... 14
5.2 Power Consumption ...................................................................................................................................... 18
Part VI Maintenance 19
Part VII Troubleshooting 20
Part VIII Repair 21
Part IX Technical Data 22
Part X Obligations of the Operator and Disposal 23
10.1 Obligations of the Operator ....................................................................................................................... 23
10.2 Dismantling / Disposal ................................................................................................................................ 23
Part XI Appendices 25
11.1 Appendix A Fine Tuning .............................................................................................................................. 25
11.2 Appendix B SDI-12 to RS232 Interface ................................................................................................. 28
11.3 Appendix C Extra SDI-12 Port .................................................................................................................. 30
11.3.1 Operation ................................................................................................................................................... 30
11.3.2 Selection .................................................................................................................................................... 30
11.3.3 Current Consumption ............................................................................................................................. 31

Copyright Notice: No parts of this work may be
reproduced in any form or by any means without the
written permission of the publisher. HyQuest
Solutions waives copyright for users to print out
parts of the documentation in hard copy for their
own use only.
Trademark Notice: HyQuest Solutions (HS) and
KISTERS products and services referred to in this
document are trademarks or registered trademarks
of HyQuest Solutions or KISTERS AG. Other product
names used may or may not be the trademarks of
their respective owners.
© 2020 HyQuest Solutions, a KISTERS Group
Company. Any rights not expressly granted herein
are reserved.
The information provided in this manual was deemed
accurate as of the publication date. However, updates
to this information may have occurred.
This manual does not include all of the details of
design, production, or variation of the equipment
nor does it cover every possible situation which may
arise during installation, operation or maintenance.
HyQuest Solutions shall not be liable for any
incidental, indirect, special or consequential damages
whatsoever arising out of or related to this
documentation and the information contained in it,
even if HyQuest Solutions has been advised of the
possibility of such damages.
Any errors found in any HyQuest Solutions product
should be reported to HyQuest Solutions where
every effort will be made to quickly resolve the
problem.
This document is public.
3© 2022 HyQuest Solutions
I Disclaimer

§ Read the user manual including all operating instructions prior to installing, connecting and powering up the HyQuest
Solutions WL3100. The manual provides information on how to operate the product. The manual is intended to be
used by qualified personnel, i.e. personnel that have been adequately trained, are sufficiently familiar with
installation, mounting, wiring, powering up and operation of the product.
§ Keep the user manual on hand for later reference!
§ If you encounter problems understanding the information in the manual (or part thereof), please consult the
manufacturer or its appointed reseller for further support.
§ HyQuest Solutions WL3100 is intended to be used in hydrometeorological or environmental monitoring applications.
§ Before starting to work, you have to check the functioning and integrity of the system.
§ Check for visible defects on the WL3100, this may or may not include any or all of the following mounting
facilities, connectors and connections, mechanical parts, internal or external communication devices, power
supplies or power supply lines, etc.
§ If defects are found that jeopardize the operational safety, work must be stopped. This is true for defects found
before starting to work as well as for defects found while working.
§ Do not use the HyQuest Solutions WL3100 in areas where there is a danger of explosion.
§ The present user manual specifies environmental/climatic operating conditions as well as mechanical and electrical
conditions. Installation, wiring, powering up and operating the HyQuest Solutions WL3100 must strictly comply with
these specifications.
§ Perform maintenance only when tools or machinery are not in operation.
§ If guards are removed to perform maintenance, replace them immediately after servicing.
§ Never make any electrical or mechanical diagnostics, inspections or repairs under any circumstances. Return the
sensor to the manufacturer’s named repair centre. You can find information on how to return items for repair in the
relevant section of the HyQuest Solutions web site.
§ Disposal instructions: After taking the HyQuest Solutions WL3100 out of service, it must be disposed of in
compliance with local waste and environmental regulations. The HyQuest Solutions WL3100 is never to be disposed in
household waste!
§ Inputs and outputs of the device are protected against electric discharges and surges (so-called ESD). Do not
touch any part of the electronic components! If you need to touch any part, please discharge yourself, i.e. by touching
grounded metal parts.
II Safety Instructions
© 2022 HyQuest Solutions 4

© 2022 HyQuest Solutions 5
Introduction
1Introduction
Thank you for choosing our product. We hope you will enjoy using the device.
HyQuest Solutions manufactures, sells, installs and operates quality instrumentation, data loggers and communication
technology. Products are designed with passion for environmental monitoring and with a deep understanding of the
quality, accuracy and robustness needed to fulfil the requirements of measurement practitioners in the field.
The present User Manual will help you understand, install and deploy the device. If, however, you feel that a particular
information is missing, incomplete or confusing, please do not hesitate to contact us for further support!
WL3100 is a dry/dry differential pressure transducer. The difference between the pressure on the high and low pressure
ports is linearised and converted to a usable 4-20 mA current output and made available as a digital serial SDI-12 output.
When used in conjunction with a Hyquest Solutions Dry Bubble Unit, Model HS-23 or the HS-55 or HS-40 Compressor
Units, it allows the measurement of water head to a fine degree of accuracy and repeatability.
Note: All units are factory calibrated over their full operating temperature and pressure range in our Environmental
Chamber and Ruska Pressure Calibrator. A calibration certificate is supplied with each Sensor.

© 2022 HyQuest Solutions 6
Installation
2Installation
Before connecting the power to the pressure transducer, you need to connect the instrument line to the pressure
transducer as follows:
Undo the nut and remove the ferrules from inside the fitting.
1. Place the nut through the tube and then place the ferrules as shown in the figure Pressure Transducer Installation- Part
(a) .
Figure 1 – Pressure Transducer Installation- Part (a)
2. Tighten the nut as shown in the figure Pressure Transducer Installation- Part (b) below.
Figure 2 – Pressure Transducer Installation- Part (b)
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Installation
1. Using a leak detector, check for leaks.
2. You are ready now to connect the power and run your WL3100.
Note: A pressure leak anywhere in the system will affect your level reading and produce erratic results.
§ Wiring Details
§ Field Setup Procedure
2.1 Wiring Details
This chapter contains the following subsections:
§ Screwless Terminals
§ External Power
2.1.1 Screwless Terminals
The plug in terminal block shown is a screwless terminal that keeps a constant tension on the wire that is inserted. (The
mating socket on the front panel of the WL3100 is sealed with a waterproofing gasket.)
2.1.2 External Power
The WL3100 will only be able to make a water level measurement if +12VDC (9.0V to 16VDC) power is connected.
An adequate 12VDC (9 to 30VDC) battery and charger option should be used if the optically isolated 4-20 mA current
loop is to be powered continuously and independently of the telemetry module or data logging equipment.
The easiest way to see if +12V is present is to press one of the WL3100 buttons and check that the backlighting comes on.
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Installation
4-20mA Interface
The 4-20mA interface in the WL3100 is optically isolated from the 0V and +12VDC on the right hand end of the
connector. The 4-20mA circuitry must be powered by the loop.
There are 2 ways to take 4-20mA measurements:
1. “Continuous Meas” set to Off (S/W Rev 7.1 and lower)
“Sampling Mode” set to Single (S/W Rev 7.2 and higher)
When the WL3100 detects loop power, it initiates a water level measurement – this takes 12 seconds – the 4-20mA
current is updated at the end of the measurement and the data logger can measure the current. Therefore the data logger
must be set for transducer “warm-up” of about 15 secs.
2. “Continuous Meas” set to On (S/W Rev 7.1 and lower)
“Sampling Mode” set to Contin+Avg X (S/W Rev 7.2 and higher)
The WL3100 is set to take a measurement continuously (every 12 secs). When the WL3100 detects loop power, it updates
the 4-20mA current within 100mS - with the water level previously measured within the last 12 secs. Therefore the data
logger can be set for a transducer “warm-up” of about 1 sec.
The following diagram shows how the 4-20mA interface must be loop powered.
(This example uses the Hyquest Solutions ML420 Data Logger.)
Please note: The SDI-12 interface and the 4-20mA interface can be used at the same time by 2 different devices. For
example, a data logger can be connected to the SDI-12 interface while an RTU is connected to the 4-20mA interface!!!
2.2 Field Setup Procedure
1. Install the WL3100 Multi Output Dry Transducer as per mechanical installation procedures.
2. Press either of the two push buttons on the dry transducer to activate the LCD display.
3. Use the scroll button to scroll through the menu to “Set Level”and press the select button.
4. Use the select button to move the blinking cursor to the desired digit position (that needs to be changed), and use the
scroll button to increment the value. When the rightmost digit is at the desired value press the select button to save
the value. Press select button again to start with the left most digit again.
5. After the select button is used to save a value ie. Water level, date, etc., then pressing the scroll button will continue to
step you through the menu as before.
6. The 4-20mA current loop will be continuously updated as the various parameters are changed.
7. The 4mA water level and the 20mA water level can be set separately. (See the menu tree structure in the LCD
Operation section)
8. The various parameters may also be set by the SDI-12 “special command” set, via the SDI-12 Input connection, or the
RS-232 connection if a laptop is available using a simple terminal emulation program whereby ASCII characters are
typed (adhering to the SDI-12 Ver 1.3 protocol). Note: If the commands are being typed by the operator, the “Comms
Type” must be set to RS232. In this mode the strict SDI-12 timing is ignored. An adapter cable needs to be used in this
mode. See section Appendix B.

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External Power
3External Power
Even though the Multi Output Dry Transducer has an internal lithium battery, an analog measurement can only be made
if +12VDC (9.0V to 16VDC) power is connected. This supplies power to the analog measurement circuitry.
An adequate 12VDC battery and charger option should be used if the 4-20 mA current loop is to be powered
continuously and independently of the telemetry module or data logging equipment.
Figure 3 – External Power Connections

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Configuration
4Configuration
1. If using the SDI-12 interface, set the required address by stepping to the “Sensor Addr” menu, and pressing the “Select”
button and then use the “Scroll” button to set the address from 0 to 9.
2. If using an SDI-12 logger, make sure the “Comms Type” is set to SDI-12. If using an RTU with an SDI-12 to RS232
adapter then set the “Comms Type” to RS232.
3. Use the staff gauge in the river to measure the water level (1.450m).
4. Step to the “Set Level” menu and set it to 1.450m.
If operating in SDI-12 mode, setup is complete.
If operating in 4-20mA mode then continue with step 5.
5. Estimate the range over which the water level will change (eg. Min level = 1.000m: Max Level = 8.000m).
6. Step to the “4mA / 20mA Level” menu.
Set the 4mA level to 1.000m.
Set the 20mA level to 8.000m.
When the water level is at 1.000m the 4-20mA current will be 4.000mA.
When the water level is at 4.500m the 4-20mA current will be 12.000mA.
When the water level is at 7.000m the 4-20mA current will be 20.000mA.
7. The range in this example is 8.000 – 1.000 = 7.000m.
Set the logger range to 7.000m (eg. ML420 range is set with TxR=7.000).
8. The offset in this example is 1.000m.
Set the logger offset to 1.000m (eg. ML420 offset is set with RvHR=1.000).
9. Set the logging interval and transducer warmup period in the data logger. There are 2 ways to set the transducer
warmup period – if the “Continuous Meas” is set to YES, then the warmup can be set as low as 1 sec. (Slightly more
power is drawn in this mode as the WL3100 continually takes measurements.) If however, the “Continuous Meas” is
set to NO, then the warmup must be set for about 15 secs (eg. Say ML420 interval is 15mins and warm up is 1 sec
then TXI=015/01).
Note: Setting the 4-20mA range to the smallest possible will give the best resolution on a 4-20mA interface!

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Operation
5Operation
The WL3100 Multi Output Dry Transducer powers up and takes a measurement at the following times:
§ When the LEVEL is displayed on the LCD, a reading is taken every 12 seconds and the Level on the LCD is updated.
§ When the 4-20mA current loop has power applied, a reading is taken every 12 seconds. The 4-20mA current loop is
updated at the same time.
§ When the SDI-12/RS232 interface requests a measurement using the Mor Ccommands.
§ When the LCD menu CONTINUOUS MEAS is set to YES, a measurement is taken every 12 secs.
§ LCD Screen
§ Power Consumption
5.1 LCD Screen
There are 7 main LCD screens available. Some screens display internal data and some allow parameters to be changed.
The screens are:
LCD SCREEN
Description
WL3100 S/W 7.2
Level 9.392 m
Display model, S/W Rev and present river level.
Sensor Addr: 2
Sensor ID: A-345
Display Sensor SDI-12 address and 5 digit ID.
Comms Type:
SDI-12
Allows the comms type to be selected SDI-12 or RS232.
4-20mA Level:
0.0-10.0 m
Indicates the 4mA Level and the 20mA Level.
Set Level:
12.392 m
Allows the present River Level to be preset - internally calculates an offset.
Calc Offset:
0.003 m
Displays the internally calculated offset generated through the previous Set Level.
Sampling Mode:
Single
Contin+Avg 3 => the river level is continuously measured and the last 5 values are averaged.
Single=> the river level is only measured when requested.
Note: When the River Level is “Set”, the difference between the user entered River Level, and the raw data measured from
the transducer is calculated. This calculated offset is saved into non-volatile memory, and is added to the raw transducer
level each time a measurement is taken. In this way all calculations are made transparent to the operator.
A measurement of the river level is initiated when a button is pressed (LCD is on) OR when “Continuous Meas” is set to Yes
and +12V is present OR when 4-20mA current is present, OR when an SDI-12 Measure command is received.
There are many other menu items that allow fine tuning of the calibration if this is required, as well as changing units of
measurement (m/ft) and pressure (psi/kPa). Please note the menu tree on the next page should be examined carefully
before embarking through it.
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Operation
Menu Tree
Normally the SCROLL button is used to step to the next menu item indicated by an arrow. However, when a time (eg. 5
Sec) is indicated above an arrow, the “Select” button is pressed for the indicated time to access the configuration menu
item.
§ Sampling Mode – Single, Continuous, Averaging
§ RS 232/SDI-12 Selection
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Operation
5.1.1 Sampling Mode – Single, Continuous, Averaging
In S/W Rev 7.1 and lower, the last menu item shown in the Configuration section is “Continuous Mode?”. This could
either be set to YES or NO.
When “Continuous Mode” is set to “NO” the WL3100 only takes a sample when:
1. The water level is displayed on the LCD or
2. An SDI-12 Measure command is received or
3. The 4-20mA loop power is detected.
When “Continuous Mode” is set to “YES” the WL3100 takes a sample:
1. Every 12 secs. (Continuously)
(This is useful if you use the SDI-12 command 0R0! as it will immediately return the most recent measurement made
within the last 12 secs – which makes the WL3100 SDI-12 interface the same as the AD375A SDI-12 interface. It can
also be useful when using the 4-20mA interface, as the 4-20mA loop current will be accurately updated 100mS after
loop power is applied – without having to wait 12 secs for a measurement to be made!!)
In S/W Rev 7.2 and higher, the last menu item shown on page 12 is “Sampling Mode”. This could either be set to Single,
Contin+Avg 1, Contin+Avg 2,……..., Contin+Avg 20.
When “Sampling Mode” is set to “Single” the WL3100 only takes a sample when:
1. The water level is displayed on the LCD or
2. An SDI-12 Measure command is received or
3. The 4-20mA loop power is detected.
When “Sampling Mode” is set to “Contin+Avg X” the WL3100 takes a sample:
1. Every 12 secs. (Continuously)
(When a sample is requested, via the display or via SDI-12 or 4-20mA, the last Xsamples are averaged. If it is known
that the water level will change very slowly, it is advantageous to set X to a high number, so that the last say 20
samples will be averaged. Note that 20 samples will take 20 x 12secs = 240 secs = 4 mins. (So the water level is
averaged over a 4 minute period) If it is known that the water level changes rapidly, then it would be better to set X to
a low number, so that say 2 samples will be averaged.)
The “Contin+Avg 1” mode only averages 1 sample, which at first appearance doesn’t seem to be very useful – this was
included to give the same operation as the above described “Continuous Mode” set to “YES”. (Read the description
above to see why this mode is useful.)
Averaging
The following diagram shows what happens when the WL3100 is set to average “5 samples”. (When in average mode, the
WL3100 takes a sample every 12 secs (Each circle represents a “sample” that is a highly filtered, 24 bit high accuracy,
temperature compensated value!)
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Operation
When a sample is requested (via the LCD, SDI-12 M command or 4-20mA), the next periodic sample will reply with an
average of the previous 5 samples (obviously the number of samples used to calculate the average will depend upon the
setting selected - between 1 and 20).
(If the SDI-12 0R0! command is used, then the samples immediately prior to the command being received are used to
perform the average!)
5.1.2 RS 232/SDI-12 Selection
The SDI-12 protocol has very strict timing requirements. The operator may use the SDI-12 to RS232 adaptor cable and
then communicate using RS232 from a PC. The “RS232" option must be selected via the LCD and pushbuttons. In this
mode all of the timing/break requirements of the SDI-12 are removed. Commands may be typed from a terminal
program such as “Hyperterm”. (See Appendix B for details of the SDI-12 to RS232 converter)
Note you must use 1200 baud, 7 bits, even parity and no handshaking.
If using an SDI-12 logger you must select the “SDI-12” option via the LCD and pushbuttons.
§ SDI-12 V1.3 Compliant Command Set
§ Special SDI-12 Commands
5.1.2.1 SDI-12 V1.3 Compliant Command Set
SDI-12 V1.3 Compliant Command Set (CRC commands are implemented)
(Please note the letter ‘a’ in the commands below refer to the SDI-12 address 0, 1, 2,….9)
Name
Command
Response
Break
Continuous spacing for at least 12
milliseconds
None
Acknowledge Active
a!
a<CR><LF>
Send Identification
aI!
allccccccccmmmmmmvvvxxx...xx<CR>
<LF>
(Refer Note 1.)
Change Address
aAb!
b<CR><LF>
Address Query
?!
a<CR><LF>
Start Measurement
aM! or aMC!
atttn<CR><LF>
(Refer Note 2)
Send Data
aD0!
a<value><CR><LF>
or
a<value><CRC><CR><LF>
Continuous Measurement
aR0! or aRC0!
a<value><CR><LF>
(Refer Note 3)
a<value><CRC><CR><LF>
Start Verification
aV!
atttn<CR><LF>
(Refer Note 4)
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Operation
Name
Command
Response
Start Concurrent Measurement
aC! or aCC!
atttnn<CR><LF>
(Refer Note 2)
Note 1:
Note 2:
The measurement command “M” and the concurrent command “C” will both return a time “ttt” of 012 indicating that the
measurement will be ready in 12 seconds. Do not request data within this 12 second window, or an empty reply will be
received. (In accordance with the SDI-12 protocol.) When an “M” command is in progress, the dry transducer will issue a
service request “a<CR><LF>” when the measurement is complete and ready for a data request. (Again, in accordance with
the SDI-12 protocol)
Note 3:
The Continuous Measurement command returns the present River Level.
If the LCD command “Continuous Meas?” is set to “Yes” then the river level is continuously measured when 12V is present
and so the aR0! returns the river level without having to issue an aM! Measure command.
Note 4:
aV! Initiate Verify Command
Test the lithium battery.
The Multi Output Dry Transducer returns a0001<CR><LF> indicating that there is 1 measurement available and it will be
ready in 0 seconds. When the Data command aD0! is issued the dry transducer will reply with:
Please note:
For more information on SDI-12 commands, go to the www.sdi-12.org website and download the “SDI-12 Protocol
Specification” available on the home page.
5.1.2.2 Special SDI-12 Commands
The following commands conform to the SDI-12 protocol, and allow specific parameters within the WL3100 to be
configured. Care should be taken with some commands, as they may destroy the factory calibration.
aXn!
Return data associated with command ’n’. The multi output dry transducer will reply with
a0001<CR><LF> The aDO! command must be issued to get the actual data.

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Operation
aXn+xxxx!
Set parameter for command ‘n’. The multi output dry transducer will reply with
a0001<CR><LF> The aDO! command must be issued to get the actual data.
Set/Get Current Value
aX0!
Get the river level (River level from last measurement).
aX0+0012.345!
Set the river level to +12.345 m (or ft).
Get Multi Output Dry Transducer Pressure
aX1!
Get the Pressure. eg. +0004.524 psi (or kPa)
Get/Set the 4mA Level
aX2!
Get the 4mA Level.
aX2+0002.5!
Sets the 4mA Level to 2.5m (or ft)
When the water level is 2.5m then the 4-20mA loop will pass 4mA
Get/Set the 20mA Level
aX3!
Get the 20mA Level.
aX3+0020.0!
Sets the 20mA Level to 20.0m (or ft)
When the water level is 20.0m then the 4-20mA loop will pass 20mA
Set/Get ID Number
aX4!
Get the dry transducer ID.
aX4+12345!
Set the dry transducer ID. Acceptable values 0-65535. This value appears in the Identify
command.
Set/Get Time
aX5!
Get the dry transducer Time.
aX5+0135!
Set the dry transducer Time to 01:35 (24 hour clock)

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Operation
Set/Get Date
aX6!
Get the dry transducer Date.
aX6+011204!
Set the dry transducer Date to 1-Dec-2004.
Set/Get the User Factor
aX7!
Get the User Factor.
aX7+0.705373!
Set the User Factor to 0.705373 m/psi
Increment the 4mA Calibration
aX96+00!
Examine the present 4mA Calibration without altering it.
(This also saves the calibration)
aX96+05!
Increment the 4mA Calibration by 5 steps
(This should be done while accurately measuring the current on the 4-20mA loop)
(If the calibration is changed, always finish by sending aX96+00! to save it)
Increment the 20mA Calibration
aX97+00!
Examine the present 20mA Calibration without altering it.
(This also saves the calibration)
aX97+03!
Increment the 20mA Calibration by 3 step
(This should be done while accurately measuring the current on the 4-20mA loop)
(If the calibration is changed, always finish by sending aX97+00! to save it)
Set/Get the Lo Pressure
(Note: This command could destroy the factory calibration)
aX98!
Get the value used to set the Low Pressure.
aX98+0000.702!
Set the Low Pressure to 0.702 psi (or kPa)
(Perform a measure aM! before setting the low pressure - see note below)
Set/Get the Hi Pressure
(Note: This command could destroy the factory calibration)
aX99!
Get the value used to set the High Pressure.

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Operation
aX99+0016.317!
Set the High Pressure to 16.317 psi (or kPa)
The normal sequence of setting the Lo or Hi pressure would be:
(Note: Accurate pressure measuring equipment is required for this procedure)
1. Set the pressure to the Lo end of the scale and measure with accurate equipment
2. Perform a measure aM!
3. Perform a Get Pressure aX1! and then Get Data aD0!
4. If the pressure is different to that measured, perform a Set Lo (or Hi) Pressure
5. Repeat steps 2, 3 and 4 for Lo pressure until the returned value matches the value on the accurate measuring
equipment.
6. Increase the pressure to the Hi end of the scale and repeat steps 1 to 5 for Hi pressure until the returned value
matches the value on the accurate measuring equipment
5.2 Power Consumption
There are several different power supply options and the current consumption depends on which option is used.
Note: Analog measurements cannot be taken unless 12V power is connected.
The 4-20mA loop current is supplied by the logger / RTU measuring the 4-20mA and does not draw any current from the
SDI-12 12V power supply!
NO EXTERNAL POWER
-
NO ANALOG
MEASUREMENT
SDI-12
12V POWER
(ALLOWS ANALOG MEASUREMENT)
ACTIVE
4-20 mA
LOOP CURRENT
Mode
Internal Lithium
Battery
(Prior to 2010 only)
Internal Lithium
Battery
SDI-12
Power
Asleep
3 to 30 FA
0
Stays awake when
12V is present
3.5mA continuous
(not measuring)
4-20 mA
RS232 Comms
< 2 mA for 45 sec
0
17 mA for 1.5 sec
(while measuring)
3.5 mA otherwise
4-20 mA
SDI-12 Comms
< 2 mA for 20 sec
0
17 mA for 1.5 sec
(while measuring)
3.5 mA otherwise
4-20 mA
LCD on
< 8 mA for 30 sec
0
70 to 83 mA @ 12V
(Backlighting on)
4-20 mA

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Maintenance
6Maintenance
The WL3100 Multi Output Dry Transducer requires no maintenance, however all connected mechanical equipment should
be periodically checked for cleanliness and ease of operation.
Models prior to 2010 had internal 3.6V AA size lithium batteries that should be replaced when required (Expected
operating life is 3 years minimum).
Figure 4 – Internal Battery Replacement
Internal Batteries Replacement Instruction:
1. Loosen the 4 screws on the enclosure lid.
2. Remove the lid.
3. Cut restraining strap.
4. Remove and replace batteries one at a time, ensuring polarity is correct, so that processor is not interrupted (only use
3.6v Lithium AA batteries).
5. Fit a new restraining strap (150mm cable tie).
6. Replace enclosure lid ensuring a proper fit.
7. Tighten the 4 screws.

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Troubleshooting
7Troubleshooting
Error Conditions
If the WL3100 Multi Output Dry Transducer is unable to take a reading (fault condition or loss of +12VDC supply from
SDI-12 port), then an error condition is indicated by:
§ The LCD displaying ERROR as the water level.
§ The 4-20mA current loop increasing to 24mA (indicating the error condition).
§ An SDI-12 measurement request will return 9999.999 as the LEVEL.
All of these readings are outside the normal measurement range.