User Manual

Thermal Conductivity Transmitter Maintenance
Symptom Cause Remedy
Blown fuse on input
power circuit.
Check fuse and replace if
necessary with 400 mA
fuse. See Section 4.3.
No output signal Blown fuse
Cable disconnected
or broken
Problem with external
read-out device
A) Check fuse o n signal
output circuit. Replace if
necessary with 50 mA
fuse. See Section 4.3.
B) Check fuse on output
power circuit. Replace if
necessary with 200mA
fuse. See Section 4.3.
Check power cable in
transmitter module. See
Figure 4.1.
Check external signal read-
out device connection.
Erratic output signal Instrument out of
calibration or
improperly calibrated
Temperature
instability inside
transmitter case
Loose cable
connection
Damaged sensor
A) Recalibrate instrument
with known calibration
gases.
B) Use appropriate calibrat i on
gas
A) Adjust heater temperature
and recalibrate. See
Section 3.6.1.
A) Check interconnection
cable.
B) Check heater cable. See
Figure 4.1.
C) Check sensor cable. See
Figure 4.1.
A) Replace sensor. Contact
factory.
Teledyne Analytical Instruments 23