
Troubleshooting
Troubleshooting Guide
6-4
48iQTL Instruction Manual
Thermo Scientific
Problem
Possible
Cause
Action
Alarm – Module
Temperature
Cable
connection
Check that DMC cable is connected
properly. Reseat if needed.
Other alarm
Make sure the instrument temperature is
not too high or in alarm.
Defective
DMC
PCB
Replace DMC board.
Alarm – 5V/24V Step Board
Cable
connection
Check the cable connections to that Step
POL board.
Alarm – Conc.
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. Be sure
the minimum trigger is set as desired.
Alarm – Analog I/O
Defective PCB
Replace Analog board.
Alarm – Digital I/O
Defective PCB
Replace Digital board.
Alarm – Auto Bkg Cal/Check
Incorrect high
alarm limit
Verify the high limit is correct via
Settings>Status and
Alarms>Concentrations screen.
Instrument
background
calibration failed
Recalibrate the instrument.
Alarm – Auto Span
Cal/Check
Incorrect high
alarm limit
Verify the high limit is correct via
Settings>Status and
Alarms>Concentrations screen.
Instrument
span
calibration failed
Recalibrate the instrument.
Alarm – Bench Temp
Thermistor Open
Cable
connection
Check connection from heater to DMC
board. Reseat if needed.
Alarm – Bench Temp
Thermistor Short
Cable
connection
Check connection from heater to DMC
board. Reseat if needed.
Alarm – Motor Speed too
low
Cable
connection
Check connection from motor to DMC
board. Reseat if needed.
Defective Heater Replace motor as needed.
Defective
DMC
board
Replace board as needed.
Alarm – Motor Speed too
high
Cable
connection
Check connection from motor to DMC
board. Reseat if needed.
Defective Heater Replace motor as needed.
Defective
DMC
board
Replace board as needed.
Summary of Contents for 48iQTL
Page 1: ...48iQTL Instruction Manual Trace Level Carbon Monoxide Analyzer 119014 00 27Sep2018 ...
Page 2: ......
Page 32: ...Operation Instrument Display 3 8 48iQTL Instruction Manual Thermo Scientific ...
Page 142: ......
Page 153: ...Calibration Calibration Thermo Scientific 48iQTL Instruction Manual 4 11 ...
Page 230: ......
Page 240: ......
Page 266: ......
Page 278: ......
Page 279: ......