Single Gas Instrument Service Manual
Instruction 0019-9166
Bacharach, Inc.
Page
15
Symptom
Cause
Remedy
Erratic display
Unit won't zero and/or span
Low batteries
Faulty Motor
Sensor connections loose or
broken
Sensor depleted or defective
P.C.B. defective
Too much gas present to zero
Probe kinked or blocked pre-
venting gas
fl
ow
Sensor connections loose or
broken
Sensor depleted or defective
P.C.B. defective
Replace batteries with four
fresh “C” Alkaline cells.
Break in a new Motor for at
30 minutes.
Replace Motor Assembly.
Refer to Section “2.6 Chamber
Assembly Servicing.”
Check Sensor connections.
See Fig 2-2.
Replace Sensor. Refer to
Section “2.4 Sensor Replace-
ment.”
Replace P.C.B. Refer to
Section “2.5 Printed Circuit
Board Replacement.”
Move unit into an area
known to be gas free.
Unkink or Replace Probe.
Check Sensor connections.
See Fig 2-2.
Replace Sensor. Refer to
Section “2.4 Sensor Replace-
ment.”
Replace P.C.B. Refer to
Section “2.5 Printed Circuit
Board Replacement.”
