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Model 9110T NOx Analyzer Instrument Maintenance
Teledyne Analytical Instruments 251
If necessary, squeeze the clips for a tighter grip on the cartridge.
Figure 11-4: Zero Air Scrubber Assembly
11.3.7.1. Changing the External Scrubber’s DFU Filter
There is also a DFU filter on the inlet of the external zero air scrubber that is included in several of the
optional calibration valve packages.
To change this filter:
1. Disconnect the tube and fitting from one end and remove the filter from the scrubber
canister.
2. Insert a new filter and reattach the tubing.
3. Ensure that the small arrow embedded on the filter points in flow direction, i.e., to
analyzer.