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Troubleshooting
Troubleshooting Guide
Thermo Scientific
146iQ Instruction Manual
6-5
Problem
Possible Cause
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.
Alarm – Intensity
Defective detector
Replace detector as needed.
Defective DMC board
Replace DMC board as needed.
Alarm – Zero Check
(Option)
Instrument out of
calibration
Recalibrate instrument.
Check gas supply.
Perform a manual calibration.
Alarm – O3 Concentration
Concentration has
exceeded range limit
Check to ensure range corresponds
with expected value. If not, select
proper range.
Concentration low
Check user-defined low set point,
set to zero.
Alarm – Lamp Heater
Current (Photometer)
Defective heater
Replace heater as needed.
Alarm – Lamp Temp Sensor
Short (Photometer)
Defective sensor
Replace sensor as needed.
Alarm – Lamp Temp Sensor
Open (Photometer)
Defective sensor
Replace sensor as needed.
Alarm – Bench Temp
Sensor Open (Photometer)
Defective sensor
Replace sensor as needed.
Alarm – Bench Temp
Sensor Short (Photometer)
Defective sensor
Replace sensor as needed.
Alarm – Lamp Connection
(Photometer)
Defective lamp
Replace lamp as needed.
Alarm – Lamp Short
(Photometer)
Defective lamp
Replace lamp as needed.
Alarm – Lamp Heater
Current (Ozone)
Defective heater
Replace heater as needed.
Alarm – Bench
Temperature (Ozone)
Dirty fan filter
Clean fan filter as needed.
Alarm – Lamp Temp Sensor
Short (Ozone)
Defective sensor
Replace sensor as needed.
Alarm – Lamp Temp Sensor
Open (Ozone)
Defective sensor
Replace sensor as needed.
Alarm – Lamp Connection
(Ozone)
Defective lamp
Replace lamp as needed.
Defective DMC board
Replace DMC board as needed.
Summary of Contents for 146iQ
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