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Technical Information
Calibrating to a Known Helium PPM Concentration
Cheapest method
Fastest response time
Requires calibration using a known Helium PPM gas mixture.
This requires calibrating using a known PPM mixture, such as a 50 PPM helium
NOTE
mixture. To sample the gas concentration, the operator may use either the standard
power probe sniffing gun (Agilent part number K9565306), or any small ID SST
or copper tubing attached to Swagelok fine metering valve (Swagelok
part number: SS-SS4).
To do this:
1
Select Test Configurations > Applications Setup.
2
Select PPM Sniff Method > Application Setup.
3
Ensure the system is in Test and the test port pressure adjusted between
5E-1 Torr 1 Torr.
4
Enter the Helium concentration in PPM in the associated field.
5
Press the Calibrate button (see Figure 46) and follow the step-by-step
instructions. The leak detector is now ready to measure the concentration
of Helium in PPM.
Measuring PPM of Helium with an Alicat Scientific Brand Mass Flow Meter
Scientific confidence added through accurate computation of both helium leak
rate, and gas flow rate.
Slower response time than without using mass flow meter at all.
Requires Alicat Scientific 1 SLM Whisper series mass flow meter.
•
Requires a mid E-5 std. cc/sec He calibrated standard leak.
Application Setup
1
Assemble a fine metering valve, as described in Figure 49 and follow the
assembly notes.
2
Connect the fine metering valve in series with the leak detector (see the
following figure).
102
Alicat Scientific part number MW-1SLPM-D-DB15/5M, GAS: Air. Comes with
DC power supply & RS232 cable.
Agilent Helium Leak Detector User Manual
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