Monroe-electronics Electrostatic Voltmeter - Isoprobe® - model 279L Instrukcja Użytkownika Pobierz pdf (Strona 7)

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E. Probe purging:

Probe purging improves instrument performance especially with regard to zero stability, noise and sensitivity to

variations in probe-to-surface spacing. An optional purge kit Model 1017/22G available from Monroe Electronics

maintains an even airflow, reduces temperature variations and filters out dust and other particles.

Contact potential is a function of these variables and should be considered when making any changes in the purging

techniques. Care should be taken to maintain the purged air as free from chemical vapor contamination as

possible.

Probes may also be purged using clean, dry oil-free air from a local source or through the use of dry nitrogen or

other inert gas. Pressure needs only be sufficient to maintain a positive flow of gas out of the sensitive aperture to

prevent foreign materials from entering and, in no case should it exceed ½ psi (14” w.c.). All materials used should

have low out-gassing properties.

For best results, leave purge in continuous operation. For long term storage, cover the end of the probe with the

plastic cap supplied or with aluminum foil to seal against contamination.

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Monroe-electronics Electrostatic Voltmeter - Isoprobe® - model 279L Instrukcja Użytkownika Strona 7