Geotech ETL WLM+T User manual

Rev 05/23/2017 Part # 12050744
Water
Level Meter +
Temperature
Installation and Operation Manual

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Table of Contents
SECTION 1: SYSTEM DESCRIPTION ...................................................................3
SECTION 2: SYSTEM INSTALLATION .................................................................6
SECTION 3: SYSTEM OPERATION .....................................................................7
SECTION 4: SYSTEM MAINTENANCE ................................................................8
SECTION 5: SYSTEM TROUBLESHOOTING ........................................................9
SECTION 6: SYSTEM SPECIFICATIONS.............................................................10
SECTION 7: SYSTEM SCHEMATIC....................................................................12
SECTION 8: REPLACEMENT PARTS LIST .......................................................... 13
EC DECLARATION OF CONFORMITY ...............................................................15
THE WARRANTY ............................................................................................17

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NOTE
DOCUMENTATION CONVENTIONS
This uses the following conventions to present information:
The following applies only to users in European countries:
This product is designated for separate collection at an appropriate
collection point. Do not dispose of as household waste.
For more information, contact the seller or the local authorities in charge
of waste management.
An exclamation point icon indicates a WARNING of a situation
or condition that could lead to personal injury or death. You
should not proceed until you read and thoroughly understand the
WARNING message.
WARNING
CAUTION
A raised hand icon indicates CAUTION information that relates to
a situation or condition that could lead to equipment malfunction
or damage. You should not proceed until you read and thoroughly
understand the CAUTION message.
A note icon indicates NOTE information. Notes provide additional
or supplementary information about an activity or concept.
Notice for consumers in Europe:
This symbol indicates that this product is to be collected
separately.

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Section 1: System Description
Function and Theory
The Geotech ETL Water Level Meter +Temperature (ETL WLM+T) is a portable
instrument used to accurately measure water levels and temperature in
monitoring wells and bore holes. The sensor consists of a stainless steel and
PTFE probe attached to a reel-mounted, PVDF-coated engineer’s tape. The
engineer's tape comes in standard or metric graduations, and is accurate to
1/100th of a foot, or 1 millimeter.
The sensor relies on fluid conductivity to determine the presence of water. An
audible signal and visible blue LED activate when the probe contacts water, and
there is a mute button to silent the signal while probing for temperature. The reel
features adjustable conductivity sensitivity to prevent false triggering.
The ETL WLM+T is intended for use as a depth to water measuring device and
temperature sampling. Using the ETL WLM+T for any other purpose may
compromise safety of the operator and/or void manufacturer’s warranty.
System Components
Figure 1-1: ETL WLM + T Front View
To avoid damage to tape and strain relief, do not over tighten reel
with probe in storage position.

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Figure 1-2: ETL WLM + T Side View
Figure 1-3: ETL WLM + T User Interface

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Figure 1-4: ETL WLM + T Probe

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Section 2: System Installation
Place the reel next to the well casing and carefully lower the probe into the well
using the tape leader guard to prevent damage to the tape.
An optional Tape Guide, to prevent the edge of the well casing from damaging
the tape, is also available from Geotech. Figure 2-1 is an example of the two
parts.
Figure 2-1: Tape Guide (optional), Tape Weight (optional), Tape Leader Guard
Optional Tape Weight Installation
Attach tape weight to tape near probe end being lowered into well.
1) Loosen the screws using and Allen wrench.
2) Slide the weight onto the tape (Figure 2-2).
3) Tighten the screws (Figure 2-3).
Do not use the tape leader guard in wells larger than 4” (10cm), as it
may fall down the well. The optional tape weight helps sink probe
into a deep or crooked well.
Figure 2-2: Fitting
(Optional) Tape Weight
Figure 2-3: Tightening
(Optional) Tape Weight

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Section 3: System Operation
Turn ON the ETL WLM+T with the ON/SENSITIVITY knob. If the buzzer makes a
loud double-signal and the LCD turns ON, the battery is adequate for normal
operation.
Lower the probe down the well to the water surface. The blue light and buzzer
will activate when it make contact with the conductive fluid.
With the probe still in contact with the water, adjust the ON/SENSITIVITY knob
clockwise until the light and buzzer barely activate. In this setting, the probe will
detect the water level and avoid false triggering.
Water level and temperature measurements can now be taken from the top of
the casing or any reference point. There is a “Mute” button on the control
faceplate that silences the signal while probing for temperature. The blue LED
will stay illuminated while the probe is in water.
The ETL WLM+T should be stored with the ON/SENSITIVITY switch in the OFF
position. To turn the unit off, rotate the switch fully counter-clockwise until the
switch clicks. If the ETL WLM+T is not used and is stored for longer than three
(3) months, remove the battery to prevent battery leakage, which can cause
internal damage.
To avoid damage to the tape and strain relief, do not over tighten
the reel with the probe in storage position.
This unit is not rated for use with hydrocarbons or flammable liquids.
If measuring depth to fluid of wells containing hydrocarbons, use
Geotech’s line of interface probe products.

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Section 4: System Maintenance
Battery Replacement
Replace the battery when the audible and visible signals become weak or the
unit does not operate.
1. Gently remove the battery tray.
2. Remove the old battery and replace it with a new one.
Cleaning
The ETL WLM+T can be cleaned with mild detergents such as trisodium
phosphate (TSP). If other detergents are used, take care to select detergents
that are compatible with PTFE, PVDF, and stainless steel. The reel should not be
submerged in any liquid, but may be cleaned with a damp cloth.
Cleaning the Conductivity/Temperature Contact
The conductivity contact of the probe should be periodically cleaned with a non-
abrasive cleaner such as isopropyl alcohol, xylene, methanol, or phosphate free
type cleaner. To clean the conductivity contact, place a small amount of the
cleaner on a cotton swab; rub the conductivity contact to remove all foreign
matter. Repeat this process until all foreign matter has been removed.
Be aware of the polarity (+, -) of the battery when placing the new
battery in the tray. Use a 9V alkaline battery only.