Geotech ET WLM User manual

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

1
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

2
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.

3
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.

4
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

5
Figure 1-2
Figure 1-3

6
Figure 1-4

7
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

8
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

9
Figure 2-2 Fitting (Optional) Tape Weight
Figure 2-3 Tightening (Optional) Tape Weight

10
Section 3: System Operation
Turn the ET WLM on with the ON/SENSITIVITY switch. If the buzzer makes a
loud signal and a red light is visible, the battery is adequate for normal operation.
Lower the probe down the well to the water surface. The light and buzzer will
activate. At this point, adjust the probe dial by rotating it counter-clockwise until
the light and buzzer turn off.
With the probe still in contact with the water, adjust the probe sensitivity dial
clockwise until the light and buzzer barely activate. In this setting, the probe will
detect the water level and avoid false triggering.
Water level measurements can now be taken from the top of the casing or any
reference point.
The ET WLM 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 ET WLM 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.
Operation of Optional Draw Down Control
1. Lower the probe to desired depth of maximum allowable draw down
with the unit in standard ET WLM mode (switch at “Right”) –see Figure
1-3.
2. Move the mode switch to the “Left “, for Draw Down mode.
3. Connect the ETWLM to a controller; such as the Geotech GeoControl
Pro or Geo Controller, which is equipped with a Draw Down feature, as
shown in Figure 1-3.
4. Operate your controller in accordance with the controller’s operation
manual. The ETWLM will stop the controller when the water level dips
below it. It will allow the controller to re-start when the water level rises
and makes contact with the probe

11
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.
Be aware of the polarity (+, -) of the battery when placing the new
battery in the tray. Use a 9V alkaline battery only.
Cleaning
The ET WLM 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, polypropylene, and stainless steel. The reel should not be
submerged in any liquid, but may be cleaned with a damp cloth.
Cleaning the Conductivity 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.

12
Section 5: System Troubleshooting
Problem: No signal (audible or visible) when unit is turned on.
Solutions:
The battery is discharged. Check or change battery (Section 4).
The circuit is malfunctioning. Contact Geotech Service.
Problem: No indication of water.
Solutions:
The conductive contact is dirty. Clean the contact (Section 4).
There is an open connection in the tape. Replace tape and/or probe.
The circuit is malfunctioning. Contact Geotech Service.
Problem: The signal (audible or visible) is intermittent.
Solutions:
There is an open connection in the tape. Replace tape and/or probe.
There is a loose connection in the circuit or the probe. Repair the
connection.
Problem: The signal (audible or visible) is continuous when not in water.
Solutions:
Make sure the meter is in standard mode. Place the mode switch to the
“Right“, for normal operation.
The conductive contact is dirty (causing bridging). Clean the contact
(Section 4).
There is a short in the tape and/or probe. Replace tape and/or probe.
The circuit is malfunctioning. Contact Geotech Service.
Problem: Controller shuts down automatically when ET WLM has draw down
feature connected.
Solutions:
ET WLM is in standard ETWLM mode. Lower the probe until it contacts
the water level and switch to draw down mode.
ET WLM is in draw down mode, but water level dropped below probe.Wait
for well to recharge and make contact with probe, or lower probe to contact
water.
For technical assistance, call Geotech Environmental Equipment at 1-303-320-
4764 or 1-800-833-7958

13
Section 6: System Specifications
Length/Weight: 100 foot (30 meters) = 9 lbs (4 kg)
200 foot (60 meters) = 11 lbs (5 kg)
300 foot (100 meters) = 14 lbs (6.5 kg)
5/8”Probe
Material: Stainless steel, PTFE, Viton
Weight: 4.68 oz (132.5 g)
Diameter: .625”(1.59 cm)
Length: 6.125”(19.7 cm)
Minimum Conductivity
Threshold (detects water at): 10µS
3/8”Probe (optional)
Material: Stainless steel, PTFE, Viton
Weight: 1 oz (30.5 g)
Diameter: .375”(1 cm)
Length: 6.5” (16.5 cm)
Minimum Conductivity
Threshold (detects water at): 10µS
Tape
Material: Polyethylene coated steel tape w/ stainless steel conductors
Accuracy: 100th of a foot/100’(3 mm/30.5
meters) Per Federal Specification:
GGG-T-106E or
Material: MDPE tape w/ stainless steel conductors
Accuracy: 100th of a foot/100’(3 mm/30.5 meters)
Reel/Frame
Material: Polypropylene & aluminum
Size: 13” H x 11”W x 7” D (33 cm H x 28 cm W x 18 cm D)

14
Unit
Battery: 9 volt alkaline
Max power: < 1 Watt
Max sound pressure output: 75 dB @ 30 cm
Insulation rating: Insulation rating is considered double as
there are no hazardous voltages or power
circuits to pose a threat to the operator.
Battery life: Continuously detecting: 8 hours
On but not detecting: >1 year
Output tone: 5 kHz
Operating temperature range: 32 –140 °F (0 –60 °C)
Operating environment: Rated for Outdoor use.
Storage temperature range: -40 –158 °F (-40 –70 °C)
Response time: <10 milliseconds
Humidity: 0-100%
Elevation: -328 –13,124 feet (-100 –4000 meters)
Tape Weight (Optional) 1” (2.54cm) OD, 4” (10.16cm) Long,
12.74oz (361g)

15
Section 7: System Schematic
---
Figure 7-1 Water Level Meter (front
view)

16
Figure 7-2 Water Level Meter (side
view)

17
Section 8: Replacement Parts List
Item #
Parts Description
Part #
1
ASSY,FRAME,GEOWLM/GIP
52050002
2
ASSY,REEL,100FT,GEOWLM
52050029
‘’
ASSY,REEL,200FT,GEOWLM
52050030
‘’
ASSY,REEL,300FT,GEOWLM
52050031
Replacement Tape Assemblies (5/8" Probe and reel not Included)
3
ASSY,TAPE,GEOWLM,POLY,100FT
52050013
‘’
ASSY,TAPE,GEOWLM,POLY,200FT
52050012
‘’
ASSY,TAPE,GEOWLM,POLY,300FT
52050014
‘’
ASSY,TAPE,GEOWLM,POLY,30M
52050072
‘’
ASSY,TAPE,GEOWLM,POLY,60M
52050042
‘’
ASSY,TAPE,GEOWLM,POLY,100M
52050053
‘’
ASSY,TAPE,GEOWLM,MDPE,100'
52050181
‘’
ASSY,TAPE,GEOWLM,MDPE,200'
52050182
‘’
ASSY,TAPE,GEOWLM,MDPE,300'
52050183
‘’
ASSY,TAPE,GEOWLM,MDPE,30M
52050230
‘’
ASSY,TAPE,GEOWLM,MDPE,60M
52050231
‘’
ASSY,TAPE,GEOWLM,MDPE,100M
52050232

18
Item #
Parts Description
Part #
Replacement Tape Assemblies (3/8" Probe Included, reel not included)
3 + 4
ASSY,TAPE,GEOWLM,100FT,3/8"
52050126
‘’
ASSY,TAPE,GEOWLM,200FT,3/8"
52050127
‘’
ASSY,TAPE,GEOWLM,300FT,3/8"
52050128
‘’
ASSY,TAPE,GEOWLM,30M,3/8"
52050129
‘’
ASSY,TAPE,GEOWLM,60M,3/8"
52050130
‘’
ASSY,TAPE,GEOWLM,100M,3/8"
52050131
‘’
ASSY,TAPE,GEOWLM,MDPE,100',3/8
52050226
‘’
ASSY,TAPE,GEOWLM,MDPE,200',3/8
52050227
‘’
ASSY,TAPE,GEOWLM,MDPE,300',3/8
52050228
‘’
ASSY,TAPE,GEOWLM,MDPE,30M,3/8
52050233
‘’
ASSY,TAPE,GEOWLM,MDPE,60M,3/8
52050234
‘’
ASSY,TAPE,GEOWLM,MDPE,100M,3/8
52050235
4
ASSY,PROBE,GEOWLM (5/8")
52050052
Reel and Control only (does not include tape or probe)
5
ASSY,CONTROL,GEOWLM TAPE LENGTH REQUIRED
52050003
6
PROBE HOLDER, 5/8", UNI-FRAME
52050063
‘’
PROBE HOLDER, 3/8" ,UNI-FRAME
52050263
7
KNOB,KNURLED,3/4x5/16",BLK (USE WITH #12050525)
12050524
8
SCREW,SS8,1/4-20X1.375",SHCS
12050525
9
NUT,NYL,1/4-20,HEX
17500129
10
KNOB,PHENOLIC,OVAL/TAPERED REEL HANDLE
12050002
11
BOLT,SS8,KNOB HANDLE STRIPPER 5/16x1.5" (1/4-20 THRD)
17500123
12
O-RING,VITON,.480X.039,BROWN
17500202
13
WASHER, WAVE
12050255
14
KNOB,INDICATING,1/4",RND (SENSITIVITY)
12050090
15
HANDLE, GRIP, VINYL, 3/4 x 5-1/16”
12050007
Not shown:
GUARD,LEADER,PROPAMIDE,NATURAL
12050060
GUIDE,TAPE,PVC
22050601
CASE,GEOWLM,100-300'
12050059
MANUAL,INSTRUCTION,GEOWLM
12050062
TAPE WEIGHT (OPTIONAL)
52050277