VH/CVH vacuum gauge/controller0 pages

TELEDYNE HASTINGS
INSTRUMENTS
DESIGN FEATURES
Teledyne Hastings Instruments (THI)
Economy Vacuum Gauges, Models VH-3 and
VH-4, are stable, dependable instruments for
less demanding applications. These modular
gauges feature solid-state construction with
a taut-band meter and provide rapid
response. The gauge tubes have excellent
stability and ruggedness and provide
pressure measurements over the 0-5 and 0-
50 Torr ranges. Dual-scale meter faces also
provide millibar readings. Environmental
tests show that the gauge tube is stable over
a wide temperature range. The instruments
are relatively free of cable-length effects,
permitting changes of cable length up to 25
feet without readjustment or recalibration.
THI VH-3 and VH-4 Vacuum Gauges use a
noble metal thermopile circuit. The hot
junctions of the thermopile are heated
directly by an AC current, while an equal
number of cold junctions are kept at ambient
temperature by heavy mounting studs. Thus
a DC voltage is generated between hot and
cold junctions. As the pressure decreases,
the lowering of the thermal conductivity of
the gas surrounding the hot junctions tends
to increase the temperature of the hot
junctions, thus increasing the output of the
thermopile.
Vacuum Controllers
THI Economy Vacuum Controllers, CVH
Models, are fully automatic, continuousreading
instruments for less demanding
applications. These modular instruments
provide dependable control with simplicity
and economy. The gauge tubes have
excellent stability and ruggedness and
provide pressure measurements over the 0-5
and 0-50 Torr ranges. Dual-scale meter faces
also provide millibar readings.
Providing control throughout the entire
scale, the adjustable control arm is set with
the pointer at the pressure desired.
VH Series
FEATURES
• Two Standard Ranges
(0-5 Torr and 0-50 Torr)
• Optional Single or
Double Control Points
• Ready for Panel
Mounting
• Optional Sensor Fittings
• Fail Safe: Loss of Power
= Loss of Vacuum
• Complete Installation
and Calibration
Accessories
APPLICATIONS
Processes Requiring Accurate
Vacuum Measurement & Control:
• Glove Boxes
• Thermal Food Containers
• Vacuum Furnaces
• Pharmaceutical Production
• Freeze Drying
• Agricultural Processes
• Air Conditioning
• Accelerators
• Plasma Coating
• Refrigeration (HVAC)
• Cryogenics
• Appliance Manufacturing
ECONOMY ANALOG VACUUM
METERS AND CONTROLLERS
Panel Mount Meter
Panel Mount Controller
Calibration Reference Tubes