Cleaning and Maintenance

122 Interface Meter: Cleaning and Maintenance

After each use, the laster-marked PVDF tape should be wiped clean and carefully rewound onto the reel.

The probe should be cleaned as follows:

Other suitable cleaning method:


Battery Replacement

Push the battery drawer in and up and then release. The battery drawer should eject slightly, allowing it to be pulled out. Replace the 9V alkaline battery.


Other General Tips

  1. The probe should be cleaned after each use.
  2. Always use grounding cable.
  3. Do not drop probe: damage to probe tip may result.
  4. If battery is weak, the start tone will not sound, and flashing “green” light will be off. Replace the 9V alkaline battery.
  5. Where possible, use a Solinst tape guide to protect the tape from scraping on well casing.
  6. Before storage, make sure the meter is turned off. If the Interface Meter is going to be stored for longer than two months, the 9V alkaline battery should be removed to avoid potential leakage.
  7. The meter can be checked by placing the probe in distilled (non-conductive) water or pure phase product, for example lamp oil (avoid bright sunlight during testing and resting the probe on the bottom of the container). A steady tone and light should be observed.
  8. To maintain Intrinsic Safety Certifications, do not splice the tape.


In rare circumstances it is possible that the 122 might sound when directed toward sunlight, and not in a liquid. This is normal and does not affect proper operation in a monitoring well.


When instrument is turned 'ON' there is a solid red light (no tone)

  1. Indicates a connection issue. Contact Solinst for further troubleshooting options.

Instrument will not turn 'ON' (no starting tone)

  1. Replace the battery
  2. Check the polarity of the battery in the drawer: make sure the + and - on the battery and the drawer match. The probe may be harmed by a reversed battery.
  3. ON/OFF button could be faulty. Contact Solinst.

When instrument is turned 'ON', it immediately sounds product tone or intermittent water tone

  1. Probe sensor may be dirty. Clean according to Cleaning and Maintenance instructions.
  2. Water may have leaked into the probe. Carefully, remove the probe, keeping the wires connected. Dry out the probe, wipe and inspect the o-ring, replace if necessary and/or lubricate with silicone. To avoid any nicks, make sure the wires are tucked back into the probe body when replacing the probe. See Probe Replacement Instructions.
  3. Tape may be damaged. Clean the tape and look for any cuts or nicks. If necessary, replace the damaged tape. To maintain the 122 Intrinsic Safety rating, do not splice or repair a damaged tape. You may contact Solinst for assistance.
  4. The reel or probe circuitry could be damaged. Please contact Solinst.

Instrument does not detect liquid

  1. Check battery. Replace if necessary.
  2. Clean probe tip following the Cleaning and Maintenance instructions.
  3. Probe may be damaged. Please contact Solinst.

Instrument detects "Product" as "Water"

  1. Note that this can happen if the probe is pulled into product too quickly and therefore pulls water in with it. Thoroughly dry the probe tip or shake the probe and try again at a slower speed.
  2. Product may have degraded or is now disturbed enough to become an emulsion. If it has a detectable level of conductivity, it will read water. Wait for it to settle and try again.

Instrument does not detect water

  1. Clean the probe tip. Follow the Cleaning and Maintenance instructions.
  2. The water could be pure and non-conductive or product may be coating the probe, in which case, shake the probe for a while in the water column to clean product from the probe.
  3. The probe circuitry could be damaged due to high voltage (static) in the well. Always use a ground cable. Please contact Solinst.