Setra System SRPM - Manual (Page 5)

5
1.2 SRPM FUNCTION
The SRPM senses very low differential pressure using high accuracy
capacitive sensor technology. The pressure difference for these
applications is the difference in static pressure between a critical
environment room and its surrounding reference area (usually a hallway
or another room). Maintaining and monitoring a static room pressure
difference ensures that the critical environment room is either protected
or isolated from a surrounding environment. Protection strategy requires
a net positive room static pressure difference, while isolation requires a
net negative static pressure difference. The SRPM can be programmed
to monitor either positive or negative room static pressure. Low pressure
sensing technology is coupled with multifunctional alarming and simple
touch screen user interface with password security protection. The BACnet
communication option allows the device to communicate with other
BACnet devices to allow the supervisory system to change confi guration
setups and monitor alarms in an open network.
User Interface: LCD Display 128 x 128 COG module, with custom RGB
LED backlight and custom 4-wire resistive touch screen
RGB Backlight. The SRPM indicates the status of the room being
monitored using visual backlight color.
Color Status
Green Room Pressure is within alarm limits
Yellow Door is open. (Door input must be enabled)
Red Room Pressure is outside alarm limits and
alarm delay period has been exceeded and
room is not in “No Isolation” mode.
Visual Feedback: LEDs, green for normal, red for alarm
Audible Feedback: Beeper will sound when pressure is out of range and
alarm delay has timed out. Volume can be adjusted between 1 to 4 in
relative sound levels up to the maximum level specifi cation of the beeper
of 85 dB at 4”. Audible alarm can also be disabled.
Quick Room Mode Change: Sometimes the room needs to be changed
quickly from in use (Occupied) to out of use (No Isolation). This is
accomplished by using 2 levels of password protection. The Operator
level allows access to change room modes but no other changes. The
Supervisor Level allows full access to all menus. In No Isolation mode
no alarms are generated even if the pressure is outside limits. To change
modes see page 22, Room Mode Change, for directions to change modes.