Edwards ELD500 Series, Инструкция по эксплуатации

Страница: 46 / 121

D13510840D - SL Extender interface
Page 36
A calibrated leak (for example CL - He 4-6) can be used to test the response time of the
arrangement.
Calibration
Using a calibrated leak together with the "CAL" mode of the helium leak detector a correct
quantitative leak rate indication can be obtained.
The helium leak detector will at first indicate the natural helium content of air. This may be
suppressed by pushing the zero button at the leak detector.
When holding the sample probe tip (
Figure 32 item 12) close to the calibrated leak an
uncalibrated indication will appear, which is typically incorrect by approximately 3 orders of
magnitude. Call up the external calibration.
With the numeric key pad the value as on the calibrated leak can be entered, thereby
correcting the indicated value accordingly.
It should be noted that the measured leak rate strongly depends on the distance and the
speed at which the probe is moved. Therefore several runs with typical sniffing parameters
are required until the maximum indication corresponds to the correct value as on the
calibrated leak. Then operate the "ENTER" pushbutton to store the value.
Troubleshooting
1. When pumping down the ELD500 SL extender interface, the leak detector is not ready for
operation within 2 minutes
Possible causes:

Sample line not connected.

ELD500 SL extender interface is not connected to the mains.

The connection flange is not connected tightly enough.

Internal leak within the leak detector.

Leaky vacuum connection.
Clearing the fault:

Connect sample line.

Connect the ELD500 SL extender interface to the mains.

Check seating and re-tighten if required.

Subject leak detector to an integral leak test.

Check O-ring.
Note:
Extensive hints concerning the calibration, sample probe leak detection method, leak testing
in general, local and integral leak detection using the ELD500 SL extender interface are given
in the ELD500 helium leak detector operating instructions.