Thermo Scientific TRACE GC Ultra Maintenance And Troubleshooting Manual page 336

Chapter 15
Maintaining a Photoionization Detector
Symptom
Tailing of sample peaks
Low sensitivity
336
Table 15-3. PID troubleshooting table (Continued)
Diagnosis
Adsorption effects caused by
degradation products inside
the cell
Contamination of the cell
Inadequate gas flow rate
settings
Leaks on the gas lines
Lamp window fogged by UV-
absorbing deposits
Flow rate of the make-up gas
is set too high
UV lamp is not adequate to
the compounds to be analyzed
Remedy
Remove deposits by baking the cell
for two hours at 400°C.
If the symptom does not disappears,
contact your customer support
organization.
Refer to Appendix B,
Communication, for contact
information.
Remove contaminants by baking the
cell for two hours at 400°C.
If the symptom does not disappears,
contact your customer support
organization.
Refer to Appendix B,
Communication, for contact
information.
Set gas flow rates to proper values.
Perform a leak test.
Refer to the Performing a Leak Check
(Capillary Column) on page 181.
Clean the lamp window.
Refer to the Clean the Lamp Window
Operating Sequence on page 323.
Reduce the flow rate of the make-up
gas down to10 ml/min or less.
Replace with an appropriate one.
Maintenance and Troubleshooting Manual
PID Troubleshooting
Customer
Customer