What might cause a row of black squares to appear on the LCD of a water sampler?
Several possible causes exist. Follow the steps below to check the battery voltage of the internal battery in the controller:
- Loosen the four screws holding the keypad lid on just enough so that the lid can be lifted off.
- Without disconnecting the cable connected to the LCD board, check the internal battery voltage for dc voltage greater than 2.9 Vdc.
- If the voltage is 2.9 Vdc or less, replace the battery with pn 13519, reattach the lid, tighten the four screws, and restart the sampler.
- If the black squares are still present on the display, check the voltage coming from the power supply to the sampler. For readings below 12.5 Vdc, contact an application engineer at Campbell Scientific for additional information and help.
FAQs Home