Activating The Sensor - Instrutech Hornet User Manual

Instruction Manual IGM401 Hornet
5.9

Activating the sensor

Before you turn on the IG filament and activate the sensor, make sure you understand all instructions and
information provided in this user manual. You can activate the sensor by one of the following methods:
1) Front Panel (Manually using front panel soft-keys - see IG CNTL and FRONT PANEL in section 5.8.2)
2) Digital Input (see IG CNTL in section 5.8.2)
3) RS485 commands (see IG CNTL in section 5.8.2)
4) Using a Convection gauge relay to activate the hot cathode sensor – Digital Input mode
-9 -2
Because the useful operating range of the InstruTech's hot cathode IGM401 is from 1.00 x 10 Torr to 5.00 x 10
-2
Torr, another vacuum gauge capable of measuring pressures above 5.00 x 10 Torr should be used to determine
when to turn on the IG filament and activate the sensor. This can simply be a manual operation by the operator
using the programming soft keys, or automated by having the IGM401 in the Digital Input mode and using
control signals from another gauge such as an InstruTech convection enhanced pirani (CG) gauge. The latter is a
recommended method of operating the hot cathode gauge. For example, you may use an InstruTech CVM211
Stinger™ or the CVM201 Super Bee™ convection gauge to activate or deactivate the hot cathode sensor. The
setpoint relay from the CVM211 or CVM201 can be physically wired to the hot cathode ANALOG connector.
(See typical connection scheme below) The relays in the CVM211 or CVM201 can be configured to energize at
the desired pressure at which the hot cathode sensor will be activated. The hot cathode sensor is activated
(operational) by applying a continuous ground thru the relay connections of the CVM211 or CVM201. The
sensor is deactivated when relay is de energized discontinuing the application of ground.
Using a convection gauge to activate the hot cathode sensor
Note - It may take up to 8 seconds for the IGM401 transducer filament to turn on after it has received a turn on
command via the front panel push button, Digital Inputs, or RS485 command control modes. The ion gauge
measurement screen may display "UNIT STATUS OFF" during the time that the IGM401 is starting the emission
and stabilizing the measurements.
InstruTech, Inc.
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