Pfeiffer Vacuum A 1204H, Operating Instructions Manual

Page: 37 / 92

Advanced settings
37
7.2 Exhaust pressure monitoring
Exhaust pressure monitoring is used to control the level of clogging in the functional
block. The nitrogen injection system is equipped with a pressure sensor that measures
the pump exhaust pressure. A pre-warning, a warning, a pre-alarm thresholds and their
associated delay can be set in
[SETTING] [EXH PRESS] [PRE-WARNING/WARNING/
PRE-ALARM] [THRESHOLD]/[DELAY] (see 8.2) .
The alarm threshold cannot be adjusted. A 5 s time delay can be set on menu [DELAY
STOP ALARM] [ENABLED] before stopping the pump.
– alarm threshold: 1990 hPa (high threshold).
If the pressure drops below 550 hPa (not adjustable value), a warning is triggered (pres-
sure sensor non-operational) after the expiry of a 10 s time delay (not adjustable value).
– warning threshold: 550 hPa (low threshold).
7.2.1 Silencer exhaust pressure measurement (option SEPM)
The SEPM (Silencer Exhaust Pressure Measurement) option measures the pressure in
the exhaust silencer. Installed in the factory, this option requires no adjustment.
The operation of this SEPM option is the same as the operation of the exhaust pressure
monitoring described in chapter above.
T T T T
1990 hPa
Exhaust pressure
Time
Alarm threshold
Warning threshold
Pre-warning threshold
550 hPa
Pre-alarm threshold
No message
Warning message
Message de pré-alerte
Warning message - low threshold
pre-warning warning pre-alarm
Pre-alarm message
alarm
Alarm m
pump stopped