Teledyne 6200E - Sulfides Analyzer - Manual (Page 252)

TROUBLESHOOTING & REPAIR Model 6200E Instruction Manual
252 M6200E Rev: A1
11.5.1. Detailed Pressure Leak Check
Obtain a leak checker similar to Teledyne Analytical Instruments part number 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.
CAUTION
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.
3. Pressurize the instrument with the leak checker or tank gas, allowing enough time to fully
pressurize the instrument through the critical flow orifice. Check each tube connection
(fittings, hose clamps) with soap bubble solution, looking for fine bubbles. Once the fittings
have been wetted with soap solution, do not re-apply vacuum as it will draw soap solution into
the instrument and contaminate it. Do not exceed 15 psi pressure.
4. If the instrument has the zero and span valve option, the normally closed ports on each valve
should also be separately checked. Connect the leak checker to the normally closed ports and
check with soap bubble solution.
5. If the analyzer is equipped with an IZS Option, connect the leak checker to the Dry Air inlet
and check with soap bubble solution.
6. Once the leak has been located and repaired, the leak-down rate of the indicated pressure
should be less than 1 in-Hg-A (0.4 psi) in 5 minutes after the pressure is turned off.
7. Clean soap solution from all surfaces, re-connect the sample and exhaust lines and replace the
instrument cover. Restart the analyzer.
11.5.2. Performing a Sample Flow Check
CAUTION
Use a separate, calibrated flow meter capable of measuring flows between 0 and 1000
cm³/min to measure the gas flow rate though the analyzer. Do not use the built in flow
measurement viewable from the front panel of the instrument.
Sample flow checks are useful for monitoring the actual flow of the instrument, to monitor drift of
the internal flow measurement. A decreasing, actual sample flow may point to slowly clogging