Thermo Scientific 49iQ Instruction Manual page 181

Thermo Scientific
Problem Possible Cause
Alarm – Cell A Pre-amp gain not set
Intensity properly
Alarm – Cell B
Intensity
Defective photometer DMC
PCB board
Alarm – Zero Check Instrument out of
(Option) calibration
Alarm – O Concentration has
3
Concentration exceeded range limit
Concentration low
Alarm – Lamp Heater Defective heater
Current (Photometer)
Alarm – Lamp Temp Defective sensor
Sensor Short
(Photometer)
Alarm – Lamp Temp Defective sensor
Sensor Open
(Photometer)
Alarm – Bench Temp Defective sensor
Sensor Open
(Photometer)
Alarm – Bench Temp Defective sensor
Sensor Short
(Photometer)
Alarm – Lamp Defective lamp
Connection
(Photometer)
Alarm – Lamp Short Defective lamp
(Photometer)
Alarm – Lamp Heater Defective heater
Current (Ozone)
Troubleshooting
Troubleshooting Guide
Action
If using a sample particulate filter,
make sure it is not blocked.
Disconnect sample particulate filter
from the sample bulkhead; if flow
increases, replace filter.
Check gain adjustment.
Replace photometer DMC PCB board.
Recalibrate instrument.
Check gas supply.
Perform a manual calibration.
Check to ensure range corresponds
with expected value. If not, select
proper range.
Check user-defined low set point, set
to zero.
Replace heater as needed.
Replace sensor as needed.
Replace sensor as needed.
Replace sensor as needed.
Replace sensor as needed.
Replace lamp as needed.
Replace lamp as needed.
Replace heater as needed.
49iQ Instruction Manual 6-5