Rebuilding The Sample Pump; Performing Leak Checks - Teledyne T360 Operation Manual

Teledyne API Model T360/T360M Operation Manual

6.3.2. Rebuilding the Sample Pump

6.3.3. Performing Leak Checks

6.3.3.1. VACUUM LEAK CHECK AND PUMP CHECK
6.3.3.2. PRESSURE LEAK CHECK
07272B DCN6552
The diaphragm in the sample pump periodically wears out and must be replaced.
A sample rebuild kit is available – see Appendix B of this manual for the part
number of the pump rebuild kit. Instructions and diagrams are included with the
kit.
Always perform a Flow and Leak Check after rebuilding the Sample Pump.
Leaks are the most common cause of analyzer malfunction; Section 6.3.3.1
presents a simple leak check procedure. Section 6.3.3.2 details a more thorough
procedure.
This method is easy and fast. It detects, but does not locate most leaks; it also
verifies that the sample pump is in good condition.
1. Turn the analyzer ON, and allow enough time for flows to stabilize.
2. Cap the sample inlet port.
3. After several minutes, when the pressures have stabilized, note the following.
In the TEST menu, note the SAMPLE PRESSURE reading.
4. If the reading is < 10 in-Hg, the pump is in good condition and there are no
large leaks.
5. Check the sample gas flow. If the flow is <10 cm
no large leaks in the instrument's pneumatics.
If you can't locate the leak by the above procedure, use the following procedure.
Obtain a leak checker similar to the Teledyne API part number 01960, which
contains a small pump, shut-off valve, and pressure gauge. Alternatively, a
convenient source of low-pressure gas is a tank of span gas, with the two-stage
regulator adjusted to less than 15 psi with a shutoff valve and pressure gauge.
Do not use bubble solution with vacuum applied to the analyzer. The
solution may contaminate the instrument. Do not exceed 15 PSIG
1. Turn OFF power to the instrument.
2. Install a leak checker or tank of gas as described above on the sample inlet
at the rear panel.
3. Remove the instrument cover and locate the inlet side of the sample pump.
Remove the flow assembly from the pump and plug it with the appropriate
gas-tight fitting.
Maintenance Schedule and Procedures
3
/min and stable, there are
CAUTION
pressure.
191