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Instruction Manual
9
Service
Calibration
9.1
Every InstruTech module is calibrated prior to shipment using nitrogen. Care should be exercised when using
gases other than nitrogen (N
Troubleshooting - Operation
9.2
Indication
Display is off / blank
Readings appear very different from
expected pressure
Ion gauge cannot be turned on
Research Screen shows filament Voltage
is present but filament current stays at 0
Research Screen shows filament voltage
and filament current are present but
gauge is shutting off
Unable to initiate degas
Voltage to filament too high
Setpoint does not actuate
InstruTech
) / air (see
Section 7
titled "Using the gauge with different gases").
2
Possible Cause
No power
The connector may not be wired
correctly
Sensor not in the proper location to
measure system pressure
The process gas is different from the gas
(Nitrogen) used to calibrate the IGM402
Sensor has been dropped causing
mechanical damage
The gauge sensor tube is contaminated
Leak in the vacuum system
Pressure exceeds 1.00 x 10
mA emission
Pressure exceeds 5.0 x 10
0.10 ma (100 µA) emission
Emission Control not functioning
Filament is open
Filament is contaminated or burned out
System pressure above 5.0 x 10
Filament contaminated or near end of its
life
Incorrect setup
Possible Solution
Check cable connections and verify that
power is being supplied
check cable connections and verify that
power is being supplied
Ensure the sensor is located in appropriate
location
Apply gas correction factor if applicable or
select the appropriate gas from the IGM402
display menu
Replace the ion gauge transducer (IG4xy)
Degas the sensor or replace the sensor
Re-check for leak in the system. Re-check that
all metal seals are used when operating
below 1.0 x 10
3
-
Decrease pressure below required value
Torr at 4
2
-
Decrease pressure below required value
Torr at
Switch to the other filament replace Ion
gauge sensor tube due to possible filament
failure or contamination
Switch to the other filament, replace sensor
or electronics
Switch to the other filament or replace sensor
-5
Torr
Decrease pressure below the required value
Switch to the other filament or replace sensor
Check setpoint setup
IGM402 Hornet
7
-
Torr
Page 74
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Table of Contents
Troubleshooting
