Teledyne 6200T - Sulfides Analyzer - Manual (Page 232)

Maintenance Model 6200T Total Sulfur Analyzer
232 Teledyne Analytical Instruments
WARNING
RISK OF ELECTRICAL SHOCK
Some operations need to be carried out with the analyzer open and
running. Exercise caution to avoid electrical shocks and electrostatic or
mechanical damage to the analyzer. Do not drop tools into the analyzer
or leave those after your procedures. Do not shorten or touch electric
connections with metallic tools while operating inside the analyzer. Use
common sense when operating inside a running analyzer.
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 usual noise performance.
5. If there is a PMT response to the external light, symmetrically tighten the
sample chamber mounting screws or replace the 1/4” vacuum tubing with new,
black PTFE tubing (this tubing will fade with time and become transparent).
Often, light leaks are also caused by O-rings being left out of the assembly.
6. Carefully replace the analyzer cover.
7. If tubing was changed, carry out a leak check (refer to Section 11.3.6).
11.3.6. Detailed Pressure Leak Check
Obtain a leak checker similar to Teledyne Analytical Instruments P/N 01960, which
contains a small pump, shut-off valve, and pressure gauge to create both over-pressure
and vacuum. Alternatively, a tank of pressurized gas, with the two stage regulator
adjusted to ≤ 15 psi, a shutoff valve and pressure gauge may be used.
ATTENTION COULD DAMAGE INSTRUMENT AND VOID WARRANTY
Once tube fittings have been wetted with soap solution under a
pressurized system, do not apply or re-apply vacuum as this will cause
soap solution to be sucked into the instrument, contaminating inside
surfaces.
Do not exceed 15 psi when pressurizing the system.
1. Turn OFF power to the instrument and remove the instrument cover.
2. Install a leak checker or a tank of gas (compressed, oil-free air or nitrogen) as
described above on the sample inlet at the rear panel.