Honeywell HERMetic UTImeter Gtex Chem, Operation And Service Manual

Page: 47 / 76

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11. Trouble shooting
11.1 Safety warning
As this equipment is designed and approved for use in an
explosive area (intrinsic safe equipment), only authorized
service stations and the factory are allowed to repair electronic
circuits.
However the customer can exchange parts and modules if the
following points are observed :
1. Never open the instrument nor carry out any repair or trouble
shooting in an hazardous area.
2. Use only original spare parts.
3. Work shall be done only by maintenance personnel who
has an experience with intrinsically safe equipment.
The design of the equipment is modular, i.e. in case of
breakdown the customer can find out which modules have to be
replaced. The instrument consists of the following modules:
• Mechanical parts
• Sensing probe
• Tape assembly
• Display unit / electronic box
• Tape cleaner
The following sections should allow to identify the defective module and to replace it.
11.3 Transmission troubles
Symptom Origin Action Section
The unit does not
switch on
Battery too low Change the battery 10.3
Corrosion of terminals (battery side) Clean the battery terminals ---
Corrosion of terminals (display unit side) Clean the display unit terminals ---
Switch defective Change the display unit 10.7
The unit switches on but
stops on the message
“battery”; the buzzer
tones continuously
Battery too low Change the battery 10.3
Symptom Origin Action Section
“No Msg “ is displayed
Sensor out of work or Renew the sensor 10.5
Tape out of work Renew the tape 10.4
“Invalid” is displayed Sensor out of work Renew the sensor 10.5
“Unknown” is displayed Sensor out of work Renew the sensor 10.5
11.2 Power supply troubles