Owner manual

ISA-44-2-OD ENMET Corporation

5.4 Trouble Shooting

Symptom Problem/Correction

When first plugged in, the unit alarms for

up to 10 - 20 minutes.

If the unit has not been used recently, this is normal. The MOS

sensor is cold and/or contaminated. Keep unit ON or PURGE (on

units so equipped) overnight with the sensor in fresh air.

Red alarm light stays on continuously, even

after allowed to operate (or PURGED)

overnight.

Either hazardous gas conditions exist, or there is a contaminated

sensor, or a bad circuit. Contact ENMET for voltage checks.

Oxygen channel is in constant alarm (amber

light and horn are on).

Probably a dead fuel cell; replace ( see Section 5.3 ). It can also be a

grossly contaminated fuel cell; replace also.

Either green or amber or red lights do not

work.

There might be a burned out lamp.

Unit fails to alarm when calibration gas is

applied.

Recalibration may be necessary. See section 6.0 If recalibration

fails, check sensor voltage, cylinder contents and pressure.

Unit gradually creeps into alarm or

sensitive.

Either hazardous gas conditions exist, or too recalibration is

necessary. On units requiring purging, rotate to PURGE once a

week for one hour to clean sensor surface.

Unit does not operate. Check the fuse next to TB-6. If the fuse element in the glass tube is

cracked or broken, replace it (p/n 64004-001). If this does not

correct the problem, contact ENMET