Emerson 7003M - Manual (Page 59)

Operator Manual
748223-K
June 2002
Rosemount Analytical Inc. A Division of Emerson Process Management Routine Servicing and Troubleshooting 6-1
Model 7003M
SECTION 6
ROUTINE SERVICING AND TROUBLESHOOTING
WARNING
ELECTRICAL SHOCK HAZARD
Servicing requires access to live parts
which can cause death or serious injury.
Refer servicing to qualified personnel.
Relay contacts wired to separate power
sources must be disconnected before
servicing.
6-1 ROUTINE SERVICING
Most service and maintenance involves
cleaning and recharging the sensor. Refer
to the instructions supplied with the sensor
for recharging and maintenance procedures.
Service is rarely required on the Model
7003M Percent Oxygen Analyzer. Repair is
limited to replacement of PCB boards,
EPROM and fuses. See Section 7
Replacement Parts.
6-2 TROUBLESHOOTING
Troubleshooting should be referred to
qualified service technicians. Refer to
Section 5-3 Circuit Descriptions, on page 5-
2, as an aide in isolating a problem.
a. Symptoms
Calibration error code displayed
Possible cause
Exhausted Sensor
Check/Test
Install know good sensor and isolate
Corrective Action
Recharge or replace sensor
Cannot adjust signal to calibration
value
Possible cause
Sensor voltage error
Check/Test
Install know good sensor and verify
voltage
Corrective Action
Recharge or replace sensor
Readings not consistent with calibra-
tion curve
Possible cause
Incorrect sensor used for application
Check/Test
Verify sensor corresponds with
application
Corrective Action
Install new sensor and calibrate with
span gas
Possible cause
Sensor temperature incorrect
Check/Test
Sensor temperature should be 0 to 50
°C
Corrective Action
Install new sensor and calibrate with
span gas
Possible cause
Incorrect span gas concentration
Check/Test
Verify span gas concentration
Corrective Action
Install new sensor and calibrate with
span gas