Thermo Scientific 450iQ Instruction Manual page 191

Thermo Scientific
Problem
Improper converter
operation
Alarm – H
S Converter
2
Temperature
Alarm – Chamber
Temperature
Alarm – Perm Gas Temp
Alarm – Pressure
Alarm – Thermocouple
Open/Short
Alarm – Flow
Possible Cause
Capillary blocked Clean or replace capillary.
Clogged PTFE line Inspect all sample lines.
Questionable calibration Verify accuracy.
gas
Converter temperature Temperature should be
too high or too low approximately 325
Molybdenum.
Low line voltage Check to see if line voltage is
within specifications.
Molybdenum consumed Replace Molybdenum converter
cartridge.
Converter temperature Molybdenum converter should be
low hot to the touch. If not, the heater
may have failed. Check that
converter temperature set point is
approximately 325
Heater failed Replace heaters as needed.
Defective PCB Replace PCB.
Incorrect Perm oven set Check that the alarm settings
temperature or alarm match the set temperature.
setting
Perm oven heater Replace thermistor.
thermistor or gas
thermistor error
Perm oven failure Replace the Perm oven.
High pressure indication Check plumbing for leaks.
Check the pump for a tear in the
diaphragm. Replace if needed.
Check that the capillary is
properly installed and o-rings are
in good shape.
Wires not connected Verify red and orange wires are
connected to the DMC board (blue
connector).
Defective heater Replace heater.
Flow low Check sample capillary for
blockage. Replace as necessary.
If using sample particulate filter,
make sure it is not blocked.
Disconnect sample particulate
filter from the sample bulkhead. If
Troubleshooting
Troubleshooting Guide
Action
°
C for
°
C.
6-7
450iQ Instruction Manual