INFICON Guardian EIES Controller - Manual (Page 44)

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Guardian Co-Deposition Controller Operating Manual
2.4.4 Sensor Setup
The Guardian controller can operate up to two standard or gas compensating
sensors. During operation, the controller must maintain a constant sensor emission
current. As a sensor is used and material is deposited on the sensor, an unwanted
leakage current can develop. When the leakage current becomes too large, the
Guardian controller can no longer control emission current.
The Emission current can be set as high as 10 mA but must be set at no more
than 4 mA when using 016-Series Thoria filaments and 2 mA when using
016-Series Yttria filaments. Correct emission current is stated on a label attached
to the plastic bag the sensor or replacement emitter was packaged in. Leakage
setting of 1/2 the emission current setting is recommended for most applications.
See
Chapter 3 for more information on sensor setup.
CAUTION
Refer to the label attached to your sensor or emitter
assembly package for correct emission current settings.
Do not operate 016-xxx series sensors with Yttria
filaments at Emission current greater than 2 mA. Instant
filament failure may occur! 016-xxx series sensors with
Thoria filaments may be operated at 4 mA emission.
Figure 2-19 Edit System Sensor Tab