7
SP-MODULE rev.04
SP-MODULE
Connecting the Sensor
To connect the sensor, refer to the wiring diagram. Make sure the
power supply is suitable for the sensor (see technical specifications at
the end of this manual).
WARNING. All wiring must be done by an authorized elec-
trician according to all applicable codes, laws and regula-
tions. Make sure that the power is off before doing any
wiring or opening the sensor to avoid electrical shocks and
equipment damage.
Pass all wiring through the bottom of the enclosure. Do
not drill holes on the side or the top of the enclosure as this
may allow water to enter the enclosure.
To punch holes through the bottom, use a hammer and punch to carefully
punch the holes you need.
Never mount the sensor near water or rain pipes, as failure
of these pipes may cause strong water jets to reach the
sensor.
Do not under any circumstances change the setting of the
calibration potentiomenter inside the enclosure. This will
decalibrate the pressure gauge.
Do not install ends of inlet (reference) and outlet (room)
tubes in walls, in insulation, in a humid environment or near
walls affected by drafts.
!
WARNING
!
WARNING
10
SP-MODULE
SP-MODULE rev.04
Span Adjustment (Complete the zero adjustment before setting span):
Span on full scale output adjustments should only be performed by using
an accurate pressure standard (electronic manometer, digital pressure
gage, etc.) with at least comparable accuracy to the SP-Module (668
Series) (<±1% full scale). With full scale pressure applied to the high
pressure port (reference port open to atmosphere) adjust span to achieve
20 mA output.
Example 1 : Unidirectional pressure range of 0 to 1"W.C. Apply
1.00"W.C., adjust span to 20 mA.
Notes: The input is reverse-voltage protected. The output is internally
protected against damage if shorted to ground. Recheck all
connections before applying power.
