WLM series water level meter operating instructions
Contents
1. WLM series water level meter Operating instructions GENERAL The WLM Series Water Level Meter is a self contained portable instrument This meter is used for measuring static water level in wells or small diameter samplers The WLM is contructed of lightweight aluminum and machined solid plastic components to provide a more rugged contruction than injection molded plastic components The electronics module can be removed so that the entire reel and tape can be cleaned and decontaminated The tapes are marked in feet 1 10 ft black numbers and 1 100 ff graduations and meet international standards for accuracy US GGG T 106E 5 and EEC CLASS II Europe Probes are constructed of stainless steel and teflon OPERATION All units are equipped with a test button so that the circuit and battery can be tested before beginning field work Push and hold down the test button for several seconds to verify that the battery will be able to keep working in the field A battery life of 2 3 years is normal provided the buzzer and light are not on Verify polarity Although difficult it is possible to insert the battery into the drawer incorrectly so please verify polarity If the battery needs to be forced into the drawer it is probably backwards During a pump test the sensitivity knob can be turned fully counterclockwise to turn the unit off The WLM meters are designed for simple operation in the field All meters are equipped with an2. af fhe same rate and are replaced as a single assembly TROUBLE SHOOTING CHART edy He ne ind hea Sensitivity 5 set 100 low mp eee ond of make certain you are not using Getonized or distilled water Use tap water Do not use delonized or d tiled water to test the meter Meter does not sound Water too pure when the probe 5 in water but works with ine test button duringlab testing Probe 6 dirty lordu saban ward creating a path of water to one electrode to the other resulting In a wef probe being detected as being in water clean with hot soapy water Sensitivity is sel too high Water s bridging the intemaltesi Remove the battery and di the button or circuli board very nil internal components amp circuit board The water has very low conductivity Increase the water sensitivy fully h hew Engang Solsona donuq in nio North Eastern USA zili Meter does nof sound whan the mobe in water while taking readings in the field Increase sensitivity or use the INT hydrocarbon detector that allows the interface to be measured Special Directions for Bottom Sensing Probe Attachment 1 Turn water sensitivity knob fully counterclockwise Push test button buzzer should not sound 2 Insert probe into about 12 inches of water making certain the bottom steel pin is not touching the bottom of the test con
3. external adjustment for water quality to provide faster water detects in very pure water For very pure water no dissolved solids turn the external knob clockwise to the 2 or 3 o clock position For very salty water turn the knob counterclockwise to the 10 or 11 o clock position This prevents bridging which occurs when the probe being wet is detected as the probe being in water Please note distilled water cannot be detected at any setting so avoid using the deionized water distilled water generally used in the cleaning process since the lons conduct the electric current that activates the circuit MAINTENANCE AND STORAGE The meter should be stored with the tape and strain relief under very slight tension just enough to keep the tape from unwinding Excessive tension will wear out the strain relief unnecessarily and prematurely The probe can be stored without the need to clean if When cleaning the probe do not use organic solvents In the event lime or calcium deposits on the probe electrodes remove the battery and soak the probe in water and vinegar 2 parts water one part vinegar overnight Since all units have a removable electronics module the reel and tape assembly can be cleaned using full immersion providing the electrical connector in the reel is kept out to the water or usingwater from a hose PROBE OR CABLE REPLACEMENT Detalled directions are included withthe new probe or tape Generally the tape and probe wear out
4. tainer Turn sensitivity knob clockwise just until the buzzer sounds corresponds to about the 8 AM position This will usually correspond to the small black mark on the faceplate 3 Lower probe until the bottom sensor touches the bottom of the vessel the buzzer should turn off If it does not turn the water sensitivity counter clockwise in 14 hour increments lifting the probe after each adjustment to see if it will still detect water Calibrating Without Water Sample Available 1 Follow step 1 2 Hold down the test button and turn sensitivity knob clockwise until the buzzer sounds 3 It may be necessary to advance the black knob about 74 72 an hour clockwise or until the beeping tone resumes when the probe is in low conductivity water This should provide just enough sensitivity that the tone will stop once the piston covers the water sensing center electrode It will only be necessary to make the above adjustment once unless the water s conductivity changes significantly
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