INFICON Composer Gas Concentration Controller - Manual (Page 135)

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Composer Operating Manual
6.2.2 Category 2; Acoustic Generator Related
NOTE: PRT stand for Platinum Resistance Thermometer, C stands for
concentration, µP stands for microphone.
6.2.3 Category 3; Acoustic Receiver Related
Table 6-2 Category 2; Acoustic Generator Related
Failure Symptom Visibility Effect on
Accuracy
Drive µP fails/not
connected
Low amplitude, Noisy C signal Noise on C
signal
Both µPs fail/not
connected
Control and Warning LEDs blink,
HALT LED illuminated N/A
Unbalanced µP
assembly
Low amplitude or Noisy C signal Noise on C
signal
Table 6-3 Category 3; Acoustic Receiver Related
Failure Symptom Visibility Effect on
Accuracy
Receiver µP fails/not
connected
Control and Warning LEDs blink,
Error relay opens N/A
Receiver µP loses
sensitivity
Noisy C signal at low P Noise on C
signal
Receiver µP loses bias No signal, Error relay opens N/A
Receiver µP has
unstable bias
Noisy C signal Noise on C
signal