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WLT
Water-Level Indicator
Operating Manual
F I S H E R R E S E A R C H L A B O R A T O R Y
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com
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CONTENTS
Operating Instructions ............................................................... pg. 3
Special Instructions ...................................................................pg. 4
“Hard” (Mineralized) Water ..................................................pg. 4
Oil Contamination.................................................................. pg. 4
Short-Curcuited Cable or Electrode ....................................pg. 4
Custom Specications ........................................................... pg. 4
Serial Number ......................................................................... pg. 5
Parts List ...................................................................................... pg. 5
Specications ............................................................................pg. 6
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1. Check the condition of the battery by the
toggle.switch.to.the.“Batt.Test”.position..If.the.battery.
has.a.charge,.the.red.LED.will.light.and.an.audible.
beep will be heard. If the battery is weak, the light
will be dim and the beep will be weak. Replace
the standard 9-volt transistor battery by removing
the two black knobs that hold the control panel in
place and lifting out the module. After replacing the
battery, carefully the module back in place and
r
2. To familiarize yourself with the action of the unit, dip
the electrode into a jar of water. When the electrode
touches.the.water,.the.LED.will.light.and.a.beep.will.
be.heard..
3. Make sure the toggle switch is in the “ON”.position..
Slowly. lower. the. electrode. cable. into. the. well,.
keeping an eye on the cable markers, which are
spaced every 5 feet. Every other cable marker - at
10, 20, 30, etc. feet - is marked with a number: No.
1 marks 10 feet, No. 2 marks 20 feet, No. 3 marks 30
feet,.etc..
4. When the LED lights and the beep is heard, the
electrode has reached the water. Check the
position of the nearest cable marker to calculate the
wa
ter.level..For.draw-down. tests,.initially.lower.the.
electrode unit when the well is not pumping. This will
help keep the cable and electrode assembly from
getting tangled around the pump column.
5. Turn off the instrument when not in use to
the.battery..
6. When the job is completed, wash the electrode.
assembly with fresh water and dry it thoroughly.
7. If your Fisher WLT is cared for in the manner due
piece of equipment, you will be assured long
and.dependable.service..
.conserve.
.any.
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SPECIAL INSTRUCTIONS
“Hard” (Mineralized) Water
When using the unit in areas of hard water, the LED and audio
beep may continue to respond after the electrode is withdrawn
from the water. In this case, it will be necessary to completely
rewind the WLT to dry or blow out the electrode before taking a
second.reading..
Oil Contamination
Lubricated parts of the pump and pump motor occasionally
leak, causing a layer of oil to oat above the water level. This oil will
foul the electrode assembly unless special precautions are taken.
If oil is suspected, place one of the small bags (probe covers) that
accompany the instrument over the electrode assembly, and fasten
it securely. Wet the bag and then proceed, following the instructions
given above. Wetting the bag will help it pass through the oil with a
minimum of contamination. The texture of the bag allows water but
prevents oil from readily passing through. An accurate reading of the
water.level.can.be.obtained.by.slowly.withdrawing.the.electrode.
assembly once it is denitely below the water level. The audible beep
and LED will indicate when the electrode has passed the oil-water
contact. If the electrode becomes contaminated with oil, it should
be washed with dish detergent and thoroughly rinsed.
Short-Circuited Cable or Electrode
Cable damage or hard-water residue on the electrode assembly
may short out the instrument, resulting in a lighted LED and an
audible beep when the instrument is turned on. Locate and repair
any shorts in the cable, and shake or blow out all residue from the
electrode assembly before using the instrument. Any short, if left
unrepaired, will cause battery drain when the instrument is left on.
Custom Specications
The WLT series cable comes in standard lengths of 100, 200,
300, 400 and 500 feet, with crimped brass markers every feet
and a brass electrode. Metric lengths of 50, 100 and 150
meters are also available with brass markers at one-meter intervals.
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Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com
For special applications, Fisher Research Laboratory will custom
manufacture any cable length up to 500 feet, marked in feet or
meters.
Serial Number
The serial number of each WLT unit is located inside the cable
spool. To access the serial number, remove the two black knobs
that hold the control panel in place. Carefully remove the control
module, revealing the serial number on the inside of the spool.
PARTS LIST
Part # Description
Replacement Cable:
201577-3240 300 Ft. Tagged and w/Brass Electrode
201577-3260 500 Ft. Tagged and w/Brass Electrode
Replacement Cable (Metric):.
202973-3310 100 M. Tagged and w/Brass Electrode
202973-3320 150 M. Tagged and w/Brass Electrode
Miscellaneous:
673051 Probe Cover (T-Bag)
150884.. 9-Volt.Battery
201577 Brass Electrode Assembly (w/36” of cable)
943061 Brass Markers (Specify Blank or Numbered)
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SPECIFICATIONS OPERATING INSTRUCTIONS
Accuracy............................. Guaranteed accuracy is ±0.4% from
probe tip to any marker.
Operating Temp..................32OF.to.120OF,.(0OC.to.50OC).
Battery..................................(1).9V.(NEDA.1604).
Weight:
WLT (w/300’ cable)............................. 1 lbs. (5k)
Shipping Weight:
WLT 300’ cable.................................... 3 lbs. (5.9k)
WLT 300’ cable w/hard case............ 18 lbs. (8.2k)
Shipping Size:
WLT (all models):..................17” X 14-3/4” X 8”
..............................................
WLT in hard case:................9-1/2” X 16-3/4” X 8-3/4”
..............................................(49cm X 42cm X 22cm)
(43cm X 37cm X 20cm)
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FRL#870419
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com
070609
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