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Instruction Manual
Introduction / General Information
1
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
above 1 Torr, convection-enhanced Pirani gauges increase the measuring range to just above atmosphere.
The InstruTech® CVG101 Worker Bee™ is a convection-enhanced Pirani vacuum gauge sensor that interfaces
with external controllers such as the InstruTech VGC301 controller. The CVG101 is also a direct drop-in
replacement pin-pin compatible gauge for the Brooks Automation, Inc. / Granville-Phillips® 275 Convectron®
gauge. The sensor connector has the same pinouts and signal as the corresponding Convectron®. It is directly
interchangeable with your existing Convectron® controllers and cables, so you don't need to change any wiring,
hardware, or process recipes.
1.2 Specifications
measurement range
accuracy - N
(typical)
2
repeatability - (typical)
operating temperature
bakeout temperature
humidity
altitude
operating
storage
mounting orientation
materials exposed
to vacuum
internal volume
internal surface area
leak integrity
weight
RF/EMI protection
environmental
InstruTech, Inc.
-4
Torr to 10 Torr. By taking advantage of convection currents that are generated
1.00 x 10
-4
to 1000 Torr
-4
1.33 x 10
to 1333 mbar
-2
1.00 x 10
Pa to 133 kPa
-4
-3
10
to 10
Torr; 0.1 mTorr resolution
-3
10
to 400 Torr; ± 10% of reading
400 to 1,000 Torr; ±2.5% of reading
± 2% of reading
0 to 50
o
C
150
o
C maximum, non-operating,
with cable or electronics removed
0 to 95% relative humidity, non-condensing
6,560 ft (2,000 m) max
41,000 ft (12,500 m) max
horizontal recommended
gold-plated tungsten, 304 & 316 stainless
glass, nickel, Teflon®
3
3
26 cm
(1.589 in
)
2
2
59.7 cm
(9.25 in
)
-9
< 1 x 10
atm cc/sec He
3 oz. (85 g)
CE compliant
RoHS
CVG101 Worker Bee
Dimensions
3.56 in. (29.0 mm)
1.14 in
(29.0 mm)
A
fitting
dimension A
1/8 in. NPT - 1/2" in. tube
1.00 in (25.4 mm)
NW16KF
1.30 in. (33.0 mm)
1.30 in. (33.0 mm)
NW25KF
1.30 in. (33.0 mm)
NW40KF
®
1 1/3 in. Mini-Conflat
1.08 in. (27.4 mm)
®
2 1/3 in. Conflat
0.85 in. ( 21.6 mm)
®
1/4 in. Cajon
4VCR
1.86 in. ( 47.2 mm)
®
1/2 in. Cajon
8VCR
1.75 in. (44.5 mm)
Part
Numbers
CVG101GA
CVG101GB
CVG101GC
CVG101GD
CVG101GE
CVG101GF
CVG101GG
CVG101GH
Page 2
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