Instrutech Super Bee CVM201 User Manual

Instruction Manual CVM201 Super Bee
InstruTech, Inc. Page 3
1 Introduction / General Information
1.1 Description
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
-4
Torr to 10 Torr. By taking advantage of convection currents that are generated
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.
1.2 Specifications
measurement range (signal)
1.0 x 10
-4
to 1000 Torr / 1.3 x 10
-4
to 1333 mbar / 1.3 x 10
-2
Pa to 133 kPa
accuracy - N
2
(typical)
1.0 x 10
-4
to 1.0 x 10
-3
Torr; 0.1 mTorr resolution
1.0 x 10
-3
to 400 Torr; ± 10% of reading
400 to 1,000 Torr; ±2.5% of reading
repeatability - (typical)
± 2% of reading
display
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)
materials exposed to gases
gold-plated tungsten, 304 & 316 stainless steel, glass, nickel, Teflon®
internal volume
1.589 in
3
(26 cm
3
)
internal surface area
9.25 in
2
(59.7 cm
2
)
weight
12 oz. (340 g)
housing (electronics)
aluminum extrusion
operating temperature
0 to +40
o
C
storage temperature
-40 to +70
o
C
bakeout temperature
150
o
C max (gauge only - electronics removed)
humidity
0 to 95% relative humidity, non-condensing
altitude
operating; 6,560 ft. (2,000 m) max storage; 41,000 ft. (12,500 m) max
mounting position
horizontal recommended
analog outputs
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
serial communications
RS485 / RS232 - ASCII protocol
input power
11 to 30 Vdc, 2 W, protected against power reversal, transients, and over-voltages
setpoint relays
two, single-pole double-throw relays (SPDT), 1 A at 30 Vdc resistive, or ac non-inductive
connectors
9-pin D-sub male and 15-pin high-density D-sub male
RF/EMI protection
CE compliant
environmental
RoHS compliant

Instrutech Super Bee CVM201 Specifications

General

Brand	Instrutech
Model	Super Bee CVM201
Category	Measuring Instruments
Language	English