Maintenance
5
SCD and NCD User Manual
85
Replace the Ozone Trap
To replace the ozone trap:
1
Load a method to cool the detector, turn off the heaters, and
turn off the hydrogen flow.
•
Turn off the heaters and allow the burner to cool.
•
Leave the oxidizer flow on.
•
Turn off the hydrogen flow.
•
Turn off the vacuum pump.
•
Set the GC oven to 30 °C (or off) to minimize column
bleed.
•
Leave (helium) carrier gas flowing.
2
Allow the vacuum pump to cool to a safe handling
temperature.
3
Remove the trap assembly and vacuum hose from the
support bracket.
4
Loosen the two hose clamps that secure the old ozone trap in
place.
5
Remove the trap from the pump intake hose. (If needed,
loosen the clamp at the pump intake.)
6
Lift the old trap from the support bracket, then remove the
detector vacuum hose from the barbed fitting on the old trap.
7
Install the new trap. Make sure that the flow direction arrow
on the new trap points towards the intake fitting. (The trap
Ozone trap
Hose clamp
Hose clamp