Details

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Bayard-Alpert hot-cathode ionization gauge tubes employ a heated filament for the source of electrons. The Agilent UHV-24 has a wide range of operating pressure capabilities. It can measure pressures below 2 x 10-10 torr. Because of its small diameter and closed structure, its ionization rate is at least twice that of other ionization gauges. The small collector diameter limits the X-ray current, which also helps extend the lower pressure limit of the gauge.

Technical Specifications

	UHV-24	UHV-24p
Pressure range	2 x 10-11 to 1 x 10-3 Torr	5 x 10-12 to 1 x 10-3 Torr
	2 x 10-11 to 1 x 10-3 mbar	6.7 x 10-12 to 1 x 10-3 mbar
Sensitivity	25 Torr-1	20 Torr-1
X-Ray limit	2 x10-11 Torr	5 x 10-12 Torr (6.7 x 10-12)
Measurement precision	+ 20% of full scale within a pressure decade
Emission current	4 milliamps default (10 A to 9.99 mA)
Bake temperature	450 ºC with cable connected
Temperature limits	Operation 0 ºC to 250 ºC; storage –15 to 80 ºC
Degas	Electron bombardment 400 volts @65 mA
Materials	304 ST, ceramic, Kovar, iridium or tungsten

Outline Drawing

Description Part Number Fitting Shipping Weight kg (lbs) UHV-24, dual tungsten filaments 9715008 2.75 in. CFF 2.0 (4.0) UHV-24, dual thoria-iridium filaments 9715007 2.75 in. CFF 2.0 (4.0) UHV-24P Extended Range,dual tungsten filaments 9715014 2.75 in. CFF 2.0 (4.0) UHV-24P Extended Range, dual thoria-iridium filaments 9715015 2.75 in. CFF 2.0 (4.0) Filament replacement kit (thoria-iridium) 9710028 0.5 (1.0) Filament replacement kit (tungsten filament) 9710018 0.5 (1.0)