Setra System SRCM - Manual (Page 13)

13
The SRCM can display up to four (4) parameters for each of 2 rooms. The
parameters can be Pressure, Temperature, Humidity, and the fourth user defined
(Ex., CO 2 ). Start with the Primary Room and set up the Parameters to be moni-
tored and displayed on the default or home screen. As Parameters and inputs
are selected further selection of parameters and inputs will become self limiting
(Ex., If Temperature is selected in Parameter 2, it is not available for selection
in Parameter 3 or 4.)
Start with Parameter 1, this is the Room Pressure. Select the Input Source as
OnBoard, ADC-Ch1 or ADC-CH-2.
Parameter 2, Select None, Temperature, or Humidity. Temperature is suggest-
ed. Select Source as ADC-Ch1, ADC-Ch2, or BACnet.
Parameter 3, Select None, Temperature or Humidity. Humidity is suggested.
Select Source as ADC-Ch1, ADC-Ch2, or BACnet.
Parameter 4 Select None, User Defined.
Touch the label box and using data entry keypad input the Room Label for the
Primary Room. This will be displayed at the top of the default screen to iden-
tify the room that the parameters refer to. Use the Primary/Secondary Room
radio buttons to select the secondary room (generally an anteroom) and label
that room if desired
This Analog Output (AO) is used to communicate the value of the differential
pressure of the Primary Room to an external source such as a Building Man-
agement System (BMS). The value is scaled as either 4-20 mA, 0-5 Vdc, or
0-10 Vdc, selectable. A normalized pressure value is generated once every 100
milliseconds. The analog output is only available for the Primary room.
Units of measurement to show on the Home screen, selectable as either inches
of Water Column ("WC) or Pascals (Pa). The unit are factory calibrated as
"WC, if the unit is changed to Pa, the rang will be change to Pascals (Pa). This
is selected from the Parameter 1 tab as it is associated with the primary room
pressure.
The SRCM is manufactured with an on-board differential pressure transducer.
This transducer is manufactured to specifications for fixed minimum and
maximum pressure measurement, known as the full-scale range of the trans-
ducer. When the on-board transducer is used exclusively, these values cannot
change. Alarm setpoints cannot be set above the positive value or below the
negative value. If a wider or narrower sensor range is required for the project,
an external pressure transducer such as a Setra 264 or Setra 267 may be chosen
to match the requirements. See more above under Primary Room or Secondary
Room.
If an external transducer is used, the full-scale values and other parameters
need to be configured into the SRCM so the unit understands the scale of mea-
surement being received on the inputs Analog CH1 or Analog CH2.
Room Parameters
Label
Primary Analog
Output
Engineering Unit
Sensor Range