Teledyne 9110AH - Nitrogen oxides analyzer - Manual (Page 180)

TELEDYNE Model 9110AH NO
X
Analyzer Operator Manual, 01620, Rev. F
9-64
9.3.10 Pneumatic System
The pneumatic system is diagrammed in Figure 8-4, Figure 8-5, depending on which options
the instrument was ordered with.
9.3.10.1 Leak Check
CAUTION
When doing a leak check do not pressurize
the M9110AH to greater than 15psi.
Damage to internal components will
occur at higher pressures.
The root cause of many performance problems is a leak. Refer to Section 8.6 for the leak check
procedure.
9.3.10.2 Pump
The external sample pump is capable of maintaining the cell pressure at 5"-Hg-A. If higher
pressures are noted, the pump may need servicing. Common pump problems and causes are:
1. Failure of ozone scrubber, thus allowing ozone into the pump. Ozone is very corrosive and
causes failure of the diaphragm. Replace catalytic ozone scrubber in the NO
2
-to-NO
converter, replace charcoal scrubber on pump pack, and rebuild the pump.
2. Sometimes the felt pads in the charcoal ozone scrubber plug up, thus restricting flow, and
decreasing effective vacuum even if pump is good.
3. Failed pump. The pump has a finite lifetime. There is a re-build kit, see the spare parts list.