Ion Science SF6 P1:p - Manual (Page 7)

SF6 P1:p MANUAL Ion Science Ltd
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Usage in practice
Owing to the practice-oriented design of the instruments, work with these is simple and reliable when
observing the following:
For leak detection
- Switch the instrument to the Search Mode (Chap. 0 , “
- Search
Mode “, Page 12).
- Guide the sniffer probe as closely as possible to the suspected
leaking locations. Establishing material contact with the sniffer probe
will be useful.
- The velocity at which the sniffer probe is advanced should be at about
20 mm/s.
- Please do not push the sniffer probe over the test specimen, but pull
it instead so as to effectively prevent the ingress of grease and dirt,
for example.
For leak measurements
- Switch the instrument to the Measurement Mode (Chap. 0 , “
- Measuring
Mode “, Page 12). Observe the displayed unit of measurement (cc/s or g/a) which is desired.
- Guide the sniffer probe as closely as possible to the suspected leaking locations. Establishing material
contact with the sniffer probe will be useful.
- The magnitude of the leak can be considered as being correctly acquired when the measured value
does not change within 2 seconds.
For concentration rise measurements (integral atm.)
- In the user set- up select the unit of measurement “ppm”.
- Place the test specimen within the chamber free of SF6, close the chamber.
- Zero the leak detector in clean ambient air by operating the “Zero” button.
- For the initial measurement with the P1:p leak detector, push the sniffer probe for approximately 10 to 20
seconds through a corresponding connection directly into the chamber. Save the measured
concentration (red triangle button). Remove the sniffer probe from the chamber.
- After the measurement time defined by the customer has elapsed, Zero the leak detector in clean air by
operating the “Zero” button, introduce the sniffer probe into the chamber again and perform the final
measurement for a duration of approximately 10 to 20 seconds. Save the measured concentration (red
triangle button). Remove the sniffer probe from the chamber.
The difference between the two saved measured values gives the rise in concentration within the
measurement time specified by the customer.