6
SP-MODULE
SP-MODULE rev.04
ATTIC
AIR INLET:
“REFERENCE”
AIR OUTLET:
“ROOM”
LOOP TO TRAP HUMIDITY
LOOP TO TRAP
HUMIDITY
1/4” (0.6cm)
DIAMETER TUBE
1/4” (0.6cm)
DIAMETER TUBE
40"
(100cm)
PLASTIC
INSECT FILTER
PLASTIC
INSECT FILTER
Pressure Fitting
3/16"I.D for tubing lengths up to 100 feet long
1/4" I.D. for tubing lengths up to 300 feet
3/8" I.D. for tubing lengths up to 900 feet
*
*
*
Fig. 3 Installation of the SP-MODULE
Always make loops in the inlet and outlet tubes. If this is not
done, humidity may permanently damage the sensor.
!
WARNING
Fig. 2 Mounting hole pattern
Figure 3 shows how to install the SP-MODULE. The end of the outlet
tube must be placed in the ventilated room with the plastic filter pro-
vided. This filter prevents insects from entering the tube.
The end of the inlet tube must be installed with the plastic filter away
from drafts.The attic can generally be used as a reference. To deter-
mine if the attic is an adequate reference, read the pressure difference
between the attic and outside. It should be close to zero.
Make a loop in both tubes (room and reference) to trap humidity (Fig. 3).
11
SP-MODULE rev.04
TECHNICAL SPECIFICATIONS
Type
SP-MODULE
Accuracy:
±1% of full scale (RSS) (includes non-
linearity, hysteresis, and non-repeatability
Nominal operating voltage:
14-28 VDC, 13-24 VAC 50/60 Hz
Operating current:
20 to 50 mA
Output
4 TO 20mA, 2-wire
Maximum pressure:
10 psig (0.7kg/cm
2
)
Loop Resistance:
0-800 ohms
Supply Voltage:
12-30 VDC
Zero and Span Adjust:
±1mA, non-interactive
Compensated Temperature
Range:
0 to 150°F (-18 to 65°C)
Thermal Effects:
0.033% FS/°F (0.018% FS/°C)
Housing:
IP54, plastic casing
Weight:
0.35 kg (unpacked)
Dimensions (LxWxH):
114 x 114 x 85 mm
Operating temperature:
0 to 150°F (-18 TO 65°C)
Storage temperature:
-40to 185°F (-40 to 85°C)
Pressure Connection:
3/16" O.D. fitting for 1/4"I.D tubing
Minimum Supply Voltage:
12+0.02x(resistance of receiver plus line)
Maximum Supply Voltage:
30+0.004x(resistance of receiver plus line)
The unit is calibrated at the factory using a 250 ohm load at 28VDC
