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Instruction Manual
Introduction / General Information
1
Description
1.1
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 InstruTech® CVM201 Super Bee™ module provides the basic signal conditioning required to turn a
convection vacuum gauge into a complete measuring instrument. The module provides linear, non-linear or log-
linear analog outputs, two setpoint relays and RS232/485 serial communications. In addition, a built-in display
provides a convenient user interface for setup and operation of the vacuum gauge.
Specifications
1.2
measurement range (signal)
accuracy - N
(typical)
2
repeatability - (typical)
display
materials exposed to gases
internal volume
internal surface area
weight
housing (electronics)
operating temperature
storage temperature
bakeout temperature
humidity
altitude
mounting position
analog outputs
serial communications
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
-4
1.0 x 10
to 1.0 x 10
-3
1.0 x 10
to 400 Torr; ± 10% of reading
400 to 1,000 Torr; ±2.5% of reading
± 2% of reading
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)
gold-plated tungsten, 304 & 316 stainless steel, glass, nickel, Teflon®
3
3
1.589 in
(26 cm
)
2
2
9.25 in
(59.7 cm
)
12 oz. (340 g)
aluminum extrusion
o
0 to +40
C
o
-40 to +70
C
o
150
C max (gauge only - electronics removed)
0 to 95% relative humidity, non-condensing
operating; 6,560 ft. (2,000 m) max
horizontal recommended
1) log-linear 1 to 8 Vdc, 1 V/decade or non-linear S-curve 0.375 to 5.659 Vdc, and
2) linear 0 to 10 Vdc
RS485 / RS232 - ASCII protocol
11 to 30 Vdc, 2 W, protected against power reversal, transients, and over-voltages
two, single-pole double-throw relays (SPDT), 1 A at 30 Vdc resistive, or ac non-inductive
9-pin D-sub male and 15-pin high-density D-sub male
CE compliant
RoHS compliant
-4
to 1333 mbar / 1.3 x 10
-3
Torr; 0.1 mTorr resolution
storage; 41,000 ft. (12,500 m) max
CVM201 Super Bee
-2
Pa to 133 kPa
Page 3
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