Chemglass AF-0304 - Manual (Page 3)

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1. INTRODUCTION
The Vacuum Gauge Indicator and Dual Set-point Controller
are compact vacuum measurement and control instru-
ments that offer the precision and high resolution of digital
electronics at the same price as analog controls. These
instruments introduce a newly developed sensor which
incorporates an up-scale trim to improve tracking
ability. The extremely rugged sensor is constructed with
a solid, inert, noble metal that maintains its characteristics
over long periods.
Cooler operating temperatures, half that of thermopile
gauges, enhances stability as does a unique temperature
compensation network. Replacement gauge tubes are
interchangeable and have time constants of less than 0.3
seconds for the 2000 mT and 20 Torr instruments. (The
100 mT instrument is slower.)
Both the indicator and controller instruments feature
simple, single hole installation. A new panel mounting
system permits easy installation of the gauges into panel
cutouts originally designed for Hastings, Varian, Televac
and other analog meters without modifications. The
standard 20 Torr and 2000 mT gauge tubes have 1/8 inch
NPT male thread or fit into quick connects sized for 1/8
inch pipe (0.405 inch dia.) The standard 100 mTorr tube
has 3/4" O.D. smooth tubulation.
While the instruments are not completely immune to shock
and vibration, they do not have a delicate analog meter
and therefore are considerably more rugged than analog
types and much more resistant to pump vibration.