5-10 | 303B Moisture Analyzer Manual
Table 5-1. Troubleshooting Chart
Symptom Possible Cause Corrective Action
No display Power cord not plugged in Plug in power cord
Blown Fuse Replace fuse (F1)
Faulty power supply board Replace power supply
board.
Display reads over range Temporarily saturated cell If normal reading is
not obtained in 1 hour
continue drydown.
Saturated cell Shut o sample ow at the
source and allow cell to dry.
Keep 303B operating
electrically.
Display reading erratic Shorted cell Replace the cell
(noisy)
Varying sample ow Replace the ow regulator
Intermittent short Replace the cell
Faulty power supply board Replace power supply board
Display reading low on Low gas ow rate Check and adjust ow rate
gas with a known moisture
content
Clogged lter or dirty Replace lter. Replace ow
sample ow valve regulator
Contaminated or dirty cell, Remove, ush and recoat cell
or partially inactive
phosphorous pentoxide
Display reading high High gas ow rate Check and adjust ow rate
on gas with a known
moisture content
Leak in sample system Do a leak test
Dirty ow meter Replace ow regulator
Shorted or partially Remove, ush and recoat cell
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