Changing The Critical Flow Orifice; Figure 10-2: Critical Flow Orifice Assembly - Teledyne t100 Operation Manual

Instrument Maintenance
10.3.4.

CHANGING THE CRITICAL FLOW ORIFICE

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Appendix B) comes with a Material and Safety Data Sheet, which contains more
information on these chemicals.
5. Refill the scrubber with charcoal at the bottom.
6. Tighten the cap on the scrubber - hand-tight only.
7. Replace the DFU filter, if required, with a new unit and discard the old.
8. Replace the scrubber assembly into its clips on the rear panel.
9. Reconnect the plastic tubing to the fitting of the particle filter.
10. Adjust the scrubber cartridge such that it does not protrude above or below the
analyzer in case the instrument is mounted in a rack. If necessary, squeeze the clips
for a tighter grip on the cartridge.
A critical flow orifice, located on the exhaust manifold maintains the proper flow rate of
gas through the T100 analyzer. Refer to section 12.4.2.1 for a detailed description of its
functionality and Section 12.4.1 for its location. Despite the fact this device is protected
by sintered stainless steel filters, it can, on occasion, clog, particularly if the instrument
is operated without a sample filter or in an environment with very fine, sub-micron
particle-size dust.
1. Turn off power to the instrument and vacuum pump.
2. Locate the critical flow orifice on the pressure sensor assembly (called out in
Figure 10-2).
3. Disconnect the pneumatic line.
4. Unscrew the NPT fitting.
Figure 10-2:
Teledyne API - T100 UV Fluorescence SO
Critical Flow Orifice Assembly
Analyzer
2
06807F DCN7335