Replace Batteries in a Ralston Field Gauge

Replace Batteries in a Field Gauge LC20

  1. Power off the gauge.
  2. Remove the four screws from the back of the gauge with a 2mm hex key/Allen wrench or Phillips-head screwdriver. Older models shipped with hexagonal sockets, newer models ship with Phillips-head screws.


  3. Remove the back panel.
  4. Remove expired batteries, and replace with fresh AA batteries.


  5. Be sure to properly align the positive and negative ends to the proper contacts.
  6. Replace the back panel.
  7. Insert and tighten the four back panel screws to 5 in-lb (0.6 N-m) to maintain water resistance.
  8. Power on the gauge to confirm the new batteries are charged and installed properly.



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