Sensor Replacement - Instrutech Hornet User Manual

Instruction Manual
9.8

Sensor Replacement

The IGM401 ion gauge module is factory calibrated for the specific ion gauge transducer (sensor) installed in it.
If both filaments fail for any reason, the sensor can be replaced with a new one. The sensitivity of the new
sensor must be re-programmed in the module electronics. Follow all instructions below in order to replace the
sensor in the field. If you prefer, you can contact the factory for return authorization and the replacement of
the sensor will be done at the factory.
To replace the sensor use the following procedure:
1. Turn off power to the IGM401.
2. Disconnect the cable from the IGM401.
3. Remove the IGM401 from the vacuum system.
4. Use a 3/32 in. size Hex key to remove the #4-40 socket head cap screws (SHCS) as shown below.
5. Detach the metal enclosure and the electronics from the sensor. Gently pull the electronics enclosure away
from the sensor using a gentle rocking motion.
6. Replace sensor. Reinstall the 4-40 SHCS (4 ea.)
7. Reprogram new sensor sensitivity. The sensitivity is a value designated by the letter "S" and marked on the
sensor End Plate.
InstruTech, Inc.
IGM401 Hornet
Page 42