Changing The Critical Flow Orifice - Teledyne T100 Instruction Manual

Instrument Maintenance

8.3.4. CHANGING THE CRITICAL FLOW ORIFICE

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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 10.3.2.1 for a detailed description of its
functionality and location. Despite the fact this 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 8-2).
3. Disconnect the pneumatic line.
4. Unscrew the NPT fitting.
Figure 8-2: Critical Flow Orifice Assembly
06807A(DCNxxxx)
Teledyne ML - T100 UV Fluorescence SO2 Analyzer
Gas Line fitting
Spring
Sintered Filter
O-Ring
Critical Flow Orifice
O-Ring
Vacuum Manifold