Agilent Technologies G8610A Operation Manual page 94

5.1.3.10.3 Calibrating to a Known Helium PPM Concentration
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Cheapest method
❑
Fastest response time
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Requires calibration using a known Helium PPM gas mixture
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 (Figure 5-14 on page 92) and follow the step-by-step
instructions. The leak detector is now ready to measure the concentration of Helium in
PPM.
5.1.3.10.4 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.
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Slower response time than without using mass flow meter at all.
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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 5-17 and follow the assembly
notes.
2. Connect the fine metering valve in series with the leak detector (Figure 5-16).
94
Agilent Technologies Helium Leak Detector
This requires calibrating using a known PPM mixture, such as a
NOTE
50 PPM helium 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).
Alicat Scientific part number MW-1SLPM-D-DB15/5M, GAS: Air. Comes with
DC power supply & RS232 cable.