INFICON Composer Gas Concentration Controller - Manual (Page 136)

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Composer Operating Manual
6.2.4 Category 4; Installation Related
Table 6-4 Category 4; Installation Related
Failure Symptom Visibility Effect on Accuracy
Acoustically noisy
environment Noisy C signal Noise on C signal
Electrically noisy
environment Noisy C signal Noise on C signal
Maximum flow rate
exceeded Noisy C signal Noise on C signal
Inlet and outlet reversed None None
Ambient temperature
exceeds setpoint Temperature and
Warning LEDs blink,
Error relay opens N/A
Low line voltage HALT lamp illuminates N/A
Analog output's load
<2K ohm None Nonlinear response of
control and C outputs
Noise on or variability of
the analog input None, (control hunting
not visible without
Monitor software for
viewing) Proportional to input
variation