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Instruction Manual
1
Introduction / General Information
Description
1.1
A hot cathode ionization gauge (IG) measures vacuum pressure by ionizing gas atoms and molecules inside the
vacuum region of the gauge transducer and measuring the quantity of ions produced. The measurement of the
resulting ion current is directly proportional to the density of gas inside the gauge transducer therefore
proportional to the pressure. As pressure inside the vacuum system drops, there are fewer ions created and
therefore ion current measured is lower translating to a lower pressure reading.
The InstruTech® IGM402 Hornet™ module provides the basic signal conditioning required to turn a hot cathode
ionization vacuum gauge into a complete measuring instrument. In addition, the IGM402 is capable of operating
two external convection vacuum gauges simultaneously. The module provides three log-linear analog outputs,
three setpoint relays and RS485 serial communications. A built-in display provides a convenient user interface
for setup and operation of the vacuum gauges. The measurement range for the hot cathode ionization gauge
part of the InstruTech IGM402 is 1 x 10
from the ion gauge and a convection gauge to provide full range vacuum measurements from 1 x 10
Torr, or simply operate the ion gauge and the two convection gauges as individual gauges.
Specifications
1.2
measurement range:
used as a full range gauge (IG+CG)
accuracy - N
(typical)
2
repeatability - (typical)
display
functionality
materials exposed to gases
sensitivity
x-ray limit
emission current
degas
overpressure protection
internal gauge volume
temperature
bakeout temperature
humidity
weight
housing (electronics)
mounting orientation
altitude
serial communications
analog outputs (3 total)
InstruTech
-9
to 5 x 10
-9
ionization (IG)
1 x 10
to 5 x 10
-4
convection (CG)
1 x 10
to 1,000 Torr / 1.3 x 10
-9
1 x 10
to 1,000 Torr / 1.3 x 10
-8
1 x 10
to 1 x 10
-3
1 x 10
to 400 Torr; ± 10% of reading,
-8
1 x 10
to 1 x 10
-3
1 x 10
to 1,000 Torr; ± 2% of reading
bright OLED display, 3 digits plus 2 digits exponent, user-selectable Torr, mbar, or Pa
ionization gauge can operate up to 2 convection gauges
dual filaments: yttria coated iridium or optional tungsten
Ion collector: tungsten
factory pre-set. Also user adjustable between 2 to 99
-10
< 5 x 10
100 µA, 4 mA
3 W, electron bombardment
gauge turns off at factory default setting of 5 x 10
3
1.0 in
(16.4 cm
operating; 0 to + 40
o
200
C (sensor only - electronics removed)
0 to 95% RH non-condensing
0.6 lb. (0.27 kg) with NW25 KF flange
aluminum extrusion
any
operating; 8,200 ft. (2,500 m) max
RS485 - User selectable BINARY protocol using InstruTech CRC8,
or ASCII protocol; minimum command interval: 50 ms
IG
one log-linear 0 to 9 Vdc, 1 V/decade, or
IG+CG
one log-linear 0.5 to 7 Vdc, 0.5 V/decade, and
CG
two log-linear 1 to 8 Vdc, 1 V/decade or non-linear 0.375 to 5.659 Vdc
-2
Torr. The IGM402 can combine the vacuum measurement
-2
-9
Torr / 1.3 x 10
to 6.7 x 10
-4
to 1,333 mbar / 1.3 x 10
-9
to 1,333 mbar / 1.3 x 10
-3
Torr; ± 15% of reading
-3
Torr; ± 5% of reading
Grid: 304 Stainless Steel Others: 316/304 SS, glass, nickel
-10
Torr, < 6.7 x 10
mbar, < 6.7 x 10
3
)
o
C
storage; -40 to + 70
IGM402 Hornet
-2
-7
mbar / 1.3 x 10
to 6.7 Pa
-2
Pa to 133 kPa
-7
Pa to 133 kPa
400 to 1,000 Torr; ± 2.5% of reading
-8
Pa
-2
Torr
o
C
storage; 41,000 ft. (12,500 m) max
-9
to 1,000
Page 5
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