Checking For Light Leaks - Teledyne T200 User Manual

C
HECKING FOR
When re-assembled or operated improperly, the PMT assembly can develop small gaps,
which let stray light from the analyzer surrounding into the PMT housing. To find such
light leaks, follow the procedures below.
1. In the Dashboard view the PMT Signal (if not visible, configure the Dashboard
to add; see Section 2.5.3).
2. Supply zero gas to the analyzer.
3. With the instrument still running, carefully remove the analyzer cover.
4. Shine a powerful flashlight or portable incandescent light at the inlet and outlet
fitting and at all of the joints of the reaction cell as well as around the PMT
housing.
The PMT value should not respond to the light, the PMT signal should remain steady
•
within its usual noise floor.
5. If there is a PMT response to the external light, symmetrically tighten the
reaction cell mounting screws or replace the 1/4" vacuum tubing with new, black
PTFE tubing (this tubing will fade with time and become transparent).
Note
6. If, during this procedure, the black PMT housing end plate for the Sensor
Assembly is removed, ensure to replace the 5 desiccant bags inside the
housing.
7. Carefully replace the analyzer cover. If tubing was changed, carry out a
pneumatic leak check (Section 5.6.11).
128 Teledyne API T200 NO/NO
L L
IGHT EAKS
C – Q
AUTION
This procedure is carried out with the analyzer running and its
cover removed.
WARNING – ELECTRICAL SHOCK HAZARD
Do NOT touch any of the inside wiring with the metal cover or
with your body.
Do NOT drop screws or tools into a running analyzer.
Often, light leaks are also caused by O-rings being left out of the
assembly.
/NO Analyzer with NumaView™ Software
2 x
P O
UALIFIED ERSONNEL NLY
083730200A DCN7962