Edwards ELD500 Series, Instruction Manual

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D13510840D - Calibrated leak - internal
Page 56
Supplied parts
The supplied parts of the CL - Internal comprises in addition:

O-ring 12 x 1.5

Two cheese head screws M 3 x 25

Sticker stating the leak rate
Assembly
Tools required

Cross-head screwdriver, size 1

Hex socket screw key, size 2.5
Installing/uninstalling the CL - Internal
See also documentation of the leak detector.
Loosen CL - Internal from the valve block by unscrewing the screws M3. Take off the electrical
connection. For installing take care that the o-ring and the sealing surfaces are clean.
Leak tightness test
Start the helium leak detector and spray a little helium through the intake opening of the TMP
fan into the leak detector.
Entering the value of the calibrated leak
To enter the value of the calibrated leak please refer to the Technical Handbook, Section "The
menu function (Overview)" or the "Description of the individual menu functions" under menu
item "Cal leak 0.0E-07".
Factory inspection
Calibrated leaks are not subject to wear and the helium loss of the calibrated leak
CL - Internal, being less than 2% per year, is negligible. Nevertheless, the leak rate may change
over years due to external influences. A factory inspection is, therefore, advisable once a
year.
A test certificate, if required for the helium calibrated leak, can be obtained through Edwards.
In that case, the calibrated leak should be forwarded to us and will be returned inspected and
recertified with the test certificate, charges applicable.
The helium flow rate stated on the main label is the actual leak rate of the calibrated leak. See
Adjustment of leak rate .
Note:
In the range of 10
-9
mbar l/s no indication must appear.