Checking For Pneumatic Leaks; Simple Vacuum Leak And Pump Check; Detailed Pressure Leak Check - Teledyne T200 User Manual

C
HECKING FOR
This section covers a simple leak check and a detailed leak check.

SIMPLE VACUUM LEAK AND PUMP CHECK

Leaks are the most common cause of analyzer malfunction. This section presents a simple
leak check, whereas the next section details a more thorough procedure. The method
described here is easy, fast and detects, but does not locate, most leaks. It also verifies the
sample pump condition.
1. Turn the analyzer ON, and allow at least 30 minutes for flows to stabilize.
2. Cap the sample inlet port (cap must be wrench-tight).
3. After several minutes, when the pressures have stabilized, note the Sample
Press (sample pressure) and the Rx Cell Press (vacuum pressure) readings.
•
•
• If both readings are < 10 in-Hg-A, the pump is in good condition.
• A new pump will create a pressure reading of about 4 in-Hg-A (at sea level).
4. When done switch off the pump and open the cap to the sample inlet port slowly
to minimize inrush flow.

DETAILED PRESSURE LEAK CHECK

If a leak cannot be located by the above procedure, obtain a leak checker that 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 a pressure gauge may be used.
ATTENTION
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. Disconnect the pump tubing on the outside rear panel and cap the pump port.
•
•
083730200A DCN7962
P
NEUMATIC
CAUTION - TECHNICAL INFORMATION
Do not exceed 15 psi when pressurizing the system during
either Simple or Detailed checks.
If both readings are equal to within 10% and less than 10 in-Hg-A, the
instrument is free of large leaks.
It is still possible that the instrument has minor leaks.
COULD DAMAGE INSTRUMENT AND VOID WARRANTY
Once tube fittings have been wetted with soap solution under a
pressurized system, do not apply or reapply vacuum as this will
cause soap solution to be sucked into the instrument,
contaminating inside surfaces.
If IZS or zero/span valves are installed, disconnect the tubing from the zero
and span gas ports and plug the ports.
Cap the DFU particle filter on the dryer.
Teledyne API T200 NO/NO
L
EAKS
/NO Analyzer with NumaView™ Software
2 x
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