Checking for light leaks – Teledyne 6200E - Sulfides Analyzer User Manual
Page 201

Model 6200E Instruction Manual
Instrument Maintenance
M6200E Rev: A1
201
• Reconnect all tubing, power up the analyzer and pump and - after a warm-up period of 30
minutes, carry out a leak test as described in Section 11.5.1.
Figure 9-4: Critical Flow Orifice Assembly
9.3.8. Checking for Light Leaks
When re-assembled or operated improperly, the M6200E can develop small leaks around the PMT,
which let stray light from the analyzer surrounding into the PMT housing. To find such light leaks,
follow the procedures below.
CAUTION:
this procedure can only be carried out with the analyzer running and its cover removed.
This procedure should only be carried out by qualified personnel.
1. Scroll the TEST functions to PMT.
2. Supply zero gas to the analyzer.
3. With the instrument still running, carefully remove the analyzer cover. Take extra care not to
touch any of the inside wiring with the metal cover or your body. Do not drop screws or tools
into a running analyzer!
4. Shine a powerful flashlight or portable incandescent light at the inlet and outlet fitting and at
all of the joints of the sample chamber as well as around the PMT housing. The PMT value
should not respond to the light, the PMT signal should remain steady within its usually noise.