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Instruction Manual
3.2.2.1 Analog Connector pin-out
CAUTION! Do not connect power to both the Analog and the RS485 connectors. Apply power only to one
or the other. Applying power to both connectors may cause damage to the gauge and other connected devices.
When using digital inputs to operate the gauge, use the 9-pin D-sub male ANALOG connector described below:
PIN NUMBER
1
2
3
4
5
6
7
8
9
Degas Status
Input Power
Analog Output 3
Power Ground 2
Sensor On/Off 1
Note - If you are replacing the analog output version of the Granville-Phillips® 354 Micro-Ion® module, simply
plug your existing cable into the IGM401 module 9-pin D-sub connector marked "Analog". See the following
page if you are using the RS485 (with setpoint Relay) version of the Granville-Phillips® 354 Micro-Ion® module.
InstruTech, Inc.
ANALOG I/O 9-Pin D-sub (DE-9P) male connector
PIN DESCRIPTION
Sensor on/off input signal. The ion gauge (IG) filament is activated by applying a
continuous ground (relative to pin 2, Power Ground). This will activate the sensor
and will turn on the filament. The IG filament is turned off by removing the ground.
See
section 5.9
for other methods of activating the sensor.
Power ground & sensor on/off ground.
Analog output (log-linear 0 to 9 Vdc, 1 V/decade).
Power input (20-28 Vdc at 30 W, minimum). Do not connect power to both the
Analog and the RS485 connectors. Apply power only to one or the other.
Degas status output signal. This is an output signal to other external instruments to
confirm degas is on or off.
Signal: Open collector transistor (ground emitter) rated at 40 V max. V
max. Transistor off = degas off, transistor on = degas on.
Degas on/off input signal. Degas is initiated by applying a momentary ground. The
degas cycle will last for 2-10 minutes (based on user setting) even if ground is
removed. The ground must be removed to start cycle again.
Analog output signal ground (Do not use for sensor on/off ground).
Emission current. Applying ground changes emission current from 100 µA to 4 mA.
Sensor status. This is an output signal to other external instruments to confirm IG
filament is on or off.
Signal: Open collector transistor (ground emitter) rated at 40 V max. V
max. Transistor off = IG filament off, transistor on = IG filament on.
5
5
9
9 Sensor Status
4
8 Emission Range
7 Analog Output Ground
6
1
6 Degas On/Off
ANALOG I/O 9-Pin D-sub male (DE-9P) connector
IGM401 Hornet
, 50 mA I
CE
C
, 50 mA I
CE
C
Page 12
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Troubleshooting
