Teledyne 6200T - Sulfides Analyzer - Manual (Page 233)

6200T Total Sulfur Analyzer Maintenance
Teledyen Analytical Instruments 233
3. Pressurize the instrument with the leak checker or tank gas, allowing enough
time to fully pressurize the instrument through the critical flow orifice.
4. Check each tube connection (fittings, hose clamps) with soap bubble solution,
looking for fine bubbles.
5. 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.
6. Do not exceed 15 psi pressure.
7. 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.
8. If the analyzer is equipped with an IZS Option, connect the leak checker to the
Dry Air inlet and check with soap bubble solution.
9. 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.
10. Clean soap solution from all surfaces, re-connect the sample and exhaust lines
and replace the instrument cover. Restart the analyzer.
11.3.7. Performing a Sample Flow Check
I MPORTANT I MPACT ON R EADINGS OR D ATA
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. For this procedure, do not refer to the built in flow
measurement shown in the front panel display screen.
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 pneumatic paths, most likely critical flow orifices or sintered
filters. To perform a sample flow check:
1. Disconnect the sample inlet tubing from the rear panel SAMPLE port (Figure
3-4).
2. Attach the outlet port of a flow meter to the sample inlet port on the rear panel.
Ensure that the inlet to the flow meter is at atmospheric pressure.
3. The sample flow measured with the external flow meter should be 650 cm³/min
 10%.
4. Low flows indicate blockage somewhere in the pneumatic pathway. Refer to
troubleshooting Section 12.3 for more information on how to fix this.
11.3.8. Hydrocarbon Scrubber ( Kicker )
There are two possible types of problems that can occur with the scrubber: pneumatic
leaks and contamination that ruins the inner tube’s ability to absorb hydrocarbons.