Instruction Manual IGM402 Hornet
InstruTech
Page 19
Setup and Operation
5
5.1
Applying power
Connect power to IGM402 using the designated pins 4 and 2 of either the 9-pin, D-sub,
ANALOG
or the
9-pin, D-sub,
RS485 COM
connector.
Do not connect power to both connectors simultaneously.
CAUTION!
The +24 Vdc Power and Power Ground pin-out connections
are not the same
on the ANALOG and
RS485 COM 9-pin D-subminiature connectors of the IGM402. Equipment damage may result if a mating
power/control cable is not wired for the correct power and ground connections. Be certain that you observe the
correct pin-out designation for the connector on the IGM402 that you intend to connect to.
Alternatively, you can power the device by connecting InstruTech’s PS501-A power supply to the ANALOG
connector of the IGM402. When you connect power, the display will show “UNIT STATUS OFF”. This indicates
the display is on but the filament is not turned on and the sensor has not been activated yet. Read this user
manual in its entirety before activating the sensor. Refer to
section 5.9
titled “Activating the sensor” for further
details.
5.2
Emission Current
4 mA or 100 µA (0.1 mA) emission current are available settings of emission current.
1)
In clean applications and operating at higher pressure ranges (5.00 x 10
-6
Torr to 5.00 x 10
-2
Torr) the
100 µA emission current setting is preferred.
2)
At lower operating pressures (1.00 x 10
-9
Torr to 5.00 x 10
-4
Torr) the 4 mA emission current setting
should be used.
3)
When using a diffusion pump or other pumps that use fluids, there is a possibility of the pump oil vapors
entering the IG transducer. These vapors may form an insulator on the internal components of the
transducer which can lead to instability or failure in controlling the emission. In this case, the 4 mA
emission current may provide improved operating lifetime and measurement performance.
5.3
Overpressure shut down
The IGM402 is provided with factory set default values for overpressure shut down. The gauge will shut off
automatically should the pressure reach or rise above the pressure shut down values shown below:
Factory set overpressure shut down values
Emission Current
Overpressure Shut
Down (Torr)
Overpressure Shut
Down (mbar)
Overpressure Shut
Down (Pa)
4 mA
1.00 x 10
-3
1.33 x 10
-3
1.33 x 10
-1
100 µA (0.1 mA)
5.00 x 10
-2
6.66 x 10
-2
6.66
