Agilent Technologies Helium Leak Detector
90
DRAFT 12
/11/17
❑ At the main screen, the system blinks the split flow symbol when split flow is
ON.
❑ When split flow is turned ON, it displays the corrected leak rate but it knows the
real leak rate value.
❑ When ZERO is pressed with when split flow ON, the system zeros out background
up to a limit equal to the maximum split flow value.
To activate split flow:
1. Place the system into TEST mode and let the leak rate stabilize. Cal
ibrate the system.
2. Press the Split Flow blue check button. The leak detector pr
ompts you to enter the leak
rate for the customer's calibrated standard leak (what the leak rate should be).
The leak detector displays the corrected leak rate,
essentially calculating a split flow
gain value. The leak detector automatically calculates the split flow factor, turns on and
calculates the range stop, based on the split flow factor.
When Split Flow is turned OFF, the system reverts back to the uncorrected leak rate.
This process must be repeated when reactivating split flow.
To setup:
1. Connect the leak detector and secondary rou
gh pump to the test chamber as seen in
Figure 5-12.
2. Install the External Calibrated Leak on the test chamber.
3. Press Te
st on the leak detector.
4. Open valve on secondary rough pump t
o evacuate test chamber.
5. Select T
est Configurations > Applications Setup and Figure 5-13 appears.
6. Select Split Flow and
press Setup and Figure 5-13 appears.
The information icon provides the necessary directions for a suc-
cessful external calibration.
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