Chapter 2 – Applications
Protective Isolation/Positive Pressurization Mode – Application 701 and 702
NOTE: It is normal for the room pressure reading to briefly go beyond the alarm limits and
then return to the desired range. This condition is caused by:
•
•
•
•
•
•
Opening the door
Walking past the sensor
Changing airflow supplied to or exhausted from the room
Set the alarm delay long enough that these normal occurrences do not cause
false alarms.
Isolation/Occupied Room
If the differential pressure falls below the low limit and remains so longer than the time set in
the alarm delay, the low pressure alarm will turn on and the DPM’s LCD displays
LOW
PRESSURE
. The alarm clears when the differential pressure rises above the low limit and the
DPM’s LCD no longer displays
LOW PRESSURE.
Anteroom
If the differential pressure falls below the low limit and remains so longer than the time set in
the alarm delay, the low pressure alarm will turn on and the DPM’s LCD displays
LOW
PRESSURE
and ANTEROOM. The alarm clears when the differential pressure rises above the low
limit and the DPM’s LCD no longer displays
LOW PRESSURE and ANTEROOM.
Infectious Isolation/Negative Pressurization Mode – Application 703 and 704
NOTE: It is normal for the room pressure reading to briefly go beyond the alarm limits and
then return to the desired range. This condition is caused by:
Opening the door
Walking past the sensor
Changing airflow supplied to or exhausted from the room
Set the alarm delay long enough that these normal occurrences do not cause
false alarms.
Isolation/Occupied Room
If the differential pressure rises above the high limit and remains so longer than the time set
in the alarm delay, the high pressure alarm will turn on and the DPM’s LCD displays
HIGH
PRESSURE
.
The alarm clears when the differential pressure falls below the high limit and the DPM’s LCD
no longer displays
HIGH PRESSURE.
Siemens Building Technologies, Inc. 9
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