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> New brand edwards pirani vacuum gauge model# prm 10
New brand edwards pirani vacuum gauge model# prm 10
BRAND NEW EDWARDS PIRANI VACUUM GAUGE MODEL# PRM 10
This range of Pirani gauge heads has been specially developed for use with the BOC Edwards Series 500, 1000, 1700, 2000 & 4000 vacuum measurement and control instruments. The total pressure range covered is 1000 to 10-4 mbar. Four gauge heads are used: PRH10K, PRM10K, PRM10KCR (corrosion resistant) and PRL10K. The pressure range of each gauge head is given in the specification.
The gauge heads all operate on the Pirani principle, at a low pressure, the thermal conductivity of any gas varies with pressure. The interior of the gauge head is open to the vacuum system and contains a filament that is electrically heated. The amount of heat lost from the filament (by conduction) to the surrounding gas diminishes as the gas pressure falls so the filament temperature rises. The electrical resistance of the filament is therefore increased. The filament forms one arm of a Wheatstone bridge which is balanced at atmospheric pressure and becomes unbalanced as the pressure decreases.
Each gauge head contains a compensating resistor to minimise the effects of changes in ambient temperature. The gauge heads also contain potentiometer controls to adjust the atmosphere and vacuum settings.
http://mfc.engr.arizona.edu/documents/E-beam/D02157880.pdf
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