Teledyne 6200E - Sulfides Analyzer - Manual (Page 200)

Instrument Maintenance Model 6200E Instruction Manual
200 M6200E Rev: A1
4. The sample chamber will separate into two halves, the stainless steel manifold assembly and
the black plastic sample chamber with window, stainless steel cylinder and O-rings.
5. The sample chamber (both plastic part and stainless steel cylinder) and glass window should
be cleaned with de-ionized water and a clean lint free cloth and dried thereafter.
6. Usually it is not necessary to clean the sample and ozone flow orifices since they are protected
by sintered filters. If tests show that cleaning is necessary, refer to section 9.3.7. below on
how to clean/replace the critical flow orifice.
7. Do not remove the sample and ozone nozzles. They are Teflon threaded and require a special
tool for reassembly. If necessary, the manifold with nozzles attached can be cleaned in an
ultrasonic bath.
8. Reassemble in proper order and re-attach onto sensor housing. Reconnect pneumatics and
heater connections, then re-attach the pneumatic sensor assembly and the cleaning procedure
is complete.
9.3.7. Cleaning or Changing Critical Flow Orifices
A critical flow orifice, located on the exhaust manifold maintains the proper flow rate of gas
through the M6200E analyzer. Refer to section 10.3.3 for a detailed description of its functionality
and location. Despite the fact this these 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.
The M6200E introduces an orifice holder that makes changing the orifice very easy. In fact, it is
recommended to keep spare orifice holder assemblies at hand to minimize downtime and swap
orifices in a matter of a few minutes. Appendix B lists several complete spare part kits for this
purpose. To clean or replace a critical flow orifice, do the following:
• Turn off power to the instrument and vacuum pump. Remove the analyzer cover and
locate the reaction cell (Section 3.1 and Figure 3-9).
• Unscrew the 1/8” sample and ozone air tubes from the reaction cell
• For orifices on the reaction cell: Unscrew the orifice holder with a 9/16” wrench. This part
holds all components of the critical flow assembly as shown in Figure 9-4. Appendix B
contains a list of spare part numbers.
• For orifices in the vacuum manifold: the assembly is similar to the one shown in Figure 9-
4, but without the orifice holder, part number 04090, and bottom O-ring OR34 and with an
NPT fitting in place of the FT 10 fitting. After taking off the connecting tube, unscrew the
NPT fitting.
• Take out the components of the assembly: a spring, a sintered filter, two O-rings and the
orifice. For the vacuum manifold only, you may need to use a scribe or pressure from the
vacuum port to get the parts out of the manifold.
• Discard the two O-rings and the sintered filter and clean the critical flow orifice in a
ultrasonic cleaner for about 30 minutes using methanol. Let the part dry.
• Re-assemble the parts as shown in Figure 9-4 and re-connect them to the reaction cell
manifold or the vacuum manifold.