Table 4-1. Troubleshooting Guidelines
SYMPTOM POSSIBLE CAUSE CORRECTIVE ACTION
No response
to manual
ZERO or
CAL
command
Unit is set up for AUTOCAL
use, and autocal unit or gases
are not present.
De-activate AUTOCAL mode by setting
Future Calibration date to 12-31-1993.
Display
shows UND
Cell signal is under-range.
Perform regular calibration.
If calibration fails, see above SYMPTOM:
"Display shows CAL FAULT". If UND
persists, replace cell and perform Initial
Calibration. NOTE: Although sensor
output is not present during UND
condition with no gas present, output will
correctly respond to the presence of gas.
When gas is no longer present, output will
no longer be present. This function serves
to alert the user that an abnormal
condition exists and calibration or other
maintenance is required.
Low gas
reading
Clogged sensor water stop
disc.
Clean or replace disc.
Misaligned stop disc. Re-align disc and gasket.
Poor gas flow or damaged cell.
See SYMPTOM "Display shows CAL
FAULT".
Obtaining Replacement Parts
See TABLE 4-2 for replacement sensor kits. To obtain a
replacement sensor, address the order or inquiry to:
Mine Safety Appliances Company
Instrument Division
P.O. Box 427, Pittsburgh, PA 15230-0427
or call, toll-free, 1-800-MSA-INST.
"!
WARNING
Use only genuine MSA replacement parts when performing
any maintenance procedures provided in this manual. Failure
to do so may seriously impair sensor performance. Repair
or alteration of the Ultima Gas Monitor, beyond the scope
of these maintenance instructions or by anyone other than
authorized MSA service personnel, could cause the product
to fail to perform as designed and persons who rely on this
product for their safety could sustain serious personal injury
or death.
Chapter 4, Maintenance
4-8
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