Tp 21: Open Temperature Sensor - ABB PGC2000 Operation And Service Manual

4. Compare the temperature zone temperatures with those of your application data sheets sent with
your chromatograph. Perform Test Procedure 30 (Checking Temperature Table Values) and
make any necessary table corrections. Bubbles at the sample valve effluent generally indicate
the sample temperature is above the bubble point of the sample. Carrier gas displacement of
sample stem groove volume may be occurring due to leaking valve seals, causing varying sample
size.
5. Increase sample flow and backpressure by adjusting metering valves at sample system. Perform
an analysis and check repeatability. If the analyzer repeats, proceed to step 11.
6. For a vapor sample valve, ensure the sample valve effluent is referenced at atmospheric
pressure. A sample shutoff valve may be required or is not operating or is not functioning
properly.
7. Perform Test Procedure 2 (Carrier and Makeup Gas Flow Adjustments).
8. Turn off power and air to the analyzer.
9. Open isothermal oven door and the programmed temperature cover (if applicable). Remove the
cover to access the column.
10. Leak test column train. When complete, close ovens with reverse procedure of step 9.
11. If leaks were found, restore air and power. After temperatures stabilize, perform an analysis to
test repeatability. If analyzer repeats, Test Procedure 20 is complete.
12. Repair sample valve, replacing stem and seals (see "SAMPLE VALVE REPAIR" in Section 8).
13. Apply air, carrier, sample, and power to the analyzer. Let temperatures stabilize and perform an
analysis and check the repeatability.

TP 21: OPEN TEMPERATURE SENSOR

It is the customer's responsibility to ensure that the area is safe and and hazard-
free, and will remain so the entire time the analyzer is open. This responsibility
includes ensuring adequate ventilation in analyzer shelter and obtaining proper
work permits, etc.
See "AIR PURGING" in Section 4 for the override function. Do not perform
override until you have read Section 4 completely and you understand and can
perform the procedure requirements.
1. Remove power and purge air from the analyzer.
2. Let all temperature zones cool to ambient.
3. Open the Controller side door.
4. Disconnect the sensor and measure its resistance value. The resistance of the temperature
probe should be approximately 440 ohms at 75°F (24°C). If open (extremely high), replace
probe. The respective probes may be tested at the locations given below:
2000-OSM, F1
CAUTION
7-11