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Instruction Manual
Introduction / General Information
1
Description
1.1
The VGC301 vacuum gauge controller is a convenient and inexpensive power supply and readout instrument for
the InstruTech® CVG101 Worker Bee™ convection-enhanced Pirani vacuum gauge sensor or a Granville-Phillips®
275 Convectron®. The 1/8-DIN housing can be used as a bench top, or mounted in a cutout in an instrument
panel. The VGC301 is powered by user supplied 12 to 30 Vdc, 2 W, or by the InstruTech PS301 power supply.
Thermal conductivity gauges measure pressure indirectly by sensing the loss of heat from a sensor to the
surrounding gases. The higher the pressure of the surrounding gas, the more heat is conducted away from the
sensor. Pirani thermal conductivity gauges maintain a sensor (usually a wire) at some constant temperature,
and measure the current or power required to maintain that temperature. A standard Pirani gauge has a useful
measuring range of about 10
above 1 Torr, convection-enhanced Pirani gauges increase the measuring range to just above atmosphere.
The VGC301 signals and relay functions are the same as found on similar convection gauge controllers from
other manufacturers. The VGC301 Controller, CVG101 vacuum gauge tube and gauge cable can be directly
interchanged with Brooks Automation, Inc. / Granville-Phillips® (GP) 375 or 475 controller, 275 Convectron®
gauge and gauge cable (Remote interface, relay and power connectors are different). Various analog output
scaling provide signal compatibility with GP controller series 375, 475, the original GP 1/4 DIN 275 Analog
Convectron Gauge Controller as well as the Mini-Convectron® module.
1.2
Specifications
measurement range (signal)
display
display engineering units
display update rate
weight
temperature
humidity
altitude
analog output
(user-selectable)
serial communications
housing
input power
setpoint relays
connectors
RF/EMI protection
environmental
InstruTech, Inc.
-4
Torr to 10 Torr. By taking advantage of convection currents that are generated
-4
1.0 x 10
to 1000 Torr / 1.3 x 10
Bright OLED, 4 digits, user-selectable Torr, mbar, or Pa,
(4 digits from 1100 Torr to 1000 Torr), (3 digits from 999 Torr to 10.0 mTorr),
(2 digits from 9.9 mTorr to 1.0 mTorr ), (1 digit from 0.9 mTorr to 0.1 mTorr)
Torr, mbar, or Pa - user selectable
0.5 sec
9 oz. (250 g)
o
operating; 0 to +40
C storage; -40 to +70
0 to 95% relative humidity, non-condensing
operating; 6,560 ft. (2,000 m) max
a) log-linear 0 to 7 Vdc or 1 to 8 Vdc, 1 V/decade, or b) linear 0 to 10 Vdc, or
c) non-linear S-curve 0.375 to 5.659 Vdc, or d) non-linear S-curve 0 to 9 Vdc
RS232 and 2 wire/4 wire RS485 - ASCII protocol
1/8-DIN panel-mount enclosure (aluminum extrusion)
12-30 Vdc, 2 W
two single-pole double-throw relays (SPDT)1 A at 30 Vdc resistive, or ac non-inductive
gauge: 9-pin D-sub female (mating connector provided as part of the gauge cable)
analog output and serial communications interface: 9-pin D-sub male
relay outputs: 6-pin pluggable terminal block (mating connector included)
power: 2-pin pluggable terminal block (mating connector included)
CE compliant
RoHS compliant
-4
to 1333 mbar / 1.3 x 10
o
C
storage; 41,000 ft. (12,500 m) max
VGC301 Controller
-2
Pa to 133 kPa
Page 3
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