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
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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 ipping 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 t the module back in place and
replace the black knobs, nger tight.
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
water 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 conserve
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 any
ne piece of equipment, you will be assured long
and dependable service.
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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 ve feet
and a exible brass electrode. Metric lengths of 50, 100 and 150
meters are also available with brass markers at one-meter intervals.
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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”
..............................................(43cm X 37cm X 20cm)
WLT in hard case: ...............9-1/2” X 16-3/4” X 8-3/4”
..............................................(49cm X 42cm X 22cm)
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Q U A L I T Y
FRL#870419
Fisher detectors are renowned for their quality.
Each detector is hand crafted in the USA with pride
P E R F O R M A N C E
The worldwide underground utility industry relys on Fisher.
Our instruments are durable, dependable, and locate deeper.
P U T A T I O N
R E
Fisher produced the rst patented metal detector in 1931. For
over 70 years, the Fisher logo has been a mark of excellence.
2 - YEAR LIMITED WARRANTY
Fisher believes in the products we produce and backs this belief
with a 2 year limited warranty.
Proof of purchase is required to make a claim under this warranty.
NOTE TO FOREIGN COUNTRY CUSTOMERS
This warranty may vary in other countries, check with your
distributor for details.
Factory warranty follows the channel of distribution.
Warranty does not cover shipping costs.
S E R V I C E
Fisher is committed to providing you, our valued customer, with
superior service. Each and every instrument is rigidly tested
and carefully inspected during assembly and before shipment.
Should you have any questions or problems, contact:
FISHER RESEARCH LABORATORY
www.GlobalTestSupply.com
070609
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