Geotech ET WLM User manual

Rev 04/22/2016 Part # 12050062
ET Water
Level Meter
Installation and Operation
Manual

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Table of Contents
Section 1: System Description ....................................................................................4
Section 2: System Installation.....................................................................................7
Section 3: System Operation ....................................................................................10
Section 4: System Maintenance................................................................................11
Section 5: System Troubleshooting...........................................................................12
Section 6: System Specifications..............................................................................13
Section 7: System Schematic ..................................................................................15
Section 8: Replacement Parts List............................................................................17
EC Declaration of Conformity....................................................................................20
The Warranty ..........................................................................................................201

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DOCUMENTATION CONVENTIONS
This document uses the following conventions to present information:
WARNING
CAUTION
NOTE
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.
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.

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Notice for consumers in Europe:
This symbol indicates that this product is to be collected
separately.
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.

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Section 1: System Description
Function and Theory
The Geotech ET Water Level Meter (ET WLM) is a portable instrument used to
accurately measure water levels in monitoring wells and bore holes. The sensor
consists of a stainless steel and PTFE probe attached to a reel-mounted,
polyethylene-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 red LED activate when the probe contacts water. It
features adjustable sensitivity, used to prevent false triggering.
The ET WLM is intended for use as a depth to water measuring device. Using
the ET WLM for any other purpose may compromise safety of the operator
and/or void manufacturer’s warranty.
To avoid damage to tape and strain relief, do not over tighten reel
with probe in storage position.
System Components
Figure 1-1

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Figure 1-2
Figure 1-3

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Figure 1-4

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Section 2: System Installation
The reel frame has a metal loop called the “hanger”. The hanger can be used to
hang the reel frame onto the well casing (as shown in Figure 2-1). The tape can
then slide easily over the side of the reel leg.
Figure 2-1 Reel frame on well casing

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If you are not able to hang the frame onto the well head, then either use the white
plastic leader guard (standard with all units), or the optional Tape Guide, to
prevent the edge of the well head from damaging the tape. Figure 2-2 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 an 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