Differential Pressure Monitor Owner’s Manual
No Isolation
–
The DPM expects to detect no air entering or leaving the patient room. This is
achieved by exhausting the same amount of air that is being supplied to the room. The DPM
monitors the differential pressure, measured by the RPT, but does not compare it to the user
defined pressure limits. While in No Isolation, the DPM does not alarm.
Setting Pressurization Mode
The pressurization mode can be set using the Pressure Mode Key Switch, the Portable
Operator’s Terminal, or the network.
A Constant Volume Controller can be used to pressurize the anteroom in the opposite mode
of the patient room (
Application 702 only
).
Pressure Mode Key Switch (optional) –
The pressurization mode may be set by changing
the position of the switch using the key. Two modes are available:
•
•
Protective Isolation/Positive Pressurization and No Isolation
Infectious
Isolation/Negative
Pressurization and No Isolation
Database Points –
The pressurization mode may be set by using the network to override
database points. This method overrides the Pressure Mode Key Switch (if present) and
renders the switch ineffective until the points are released by an operator. The LCD will
display the status message
SWITCH OVERRIDE
when a Pressure Mode Key Switch is present.
The
SWITCH OVERRIDE
message will not appear with the keyless version of the DPM.
Pressurization Switchover
Whenever the pressurization mode is changed, pressurization in the controlled rooms
changes and requires time to stabilize. When switchover begins, the DPM ignores abnormal
pressurization for a defined amount of time. The DPM will check status, if pressurization is
still abnormal, the DPM will wait a defined amount of time before triggering an alarm.
During switchover, the DPM’s LCD continues to display the original pressurization mode and
flashes the new pressurization mode, and the Normal LED is turned off. Once switchover
time is complete, the LCD displays only the new pressurization mode, and the Normal LED is
turned on, assuming the room has also switched and is controlling properly.
Pressure Alarms
An alarm condition can exist whenever the pressurization mode is set to either Protective or
Infectious Isolation. The following situations will cause an alarm:
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