Installation Guide
Differential Pressure Switches
CSE-1102/1103
Mounting
Select a mounting location that is free from vibration.
Mount in any vertical plane in order to obtain the
lowest specified operating setpoint. Avoid mounting
with the sample line connections in the “up” posi-
tion. Surface mount via the two 3/16" diameter holes
in the integral mounting bracket. The mounting
holes are 3-7/8" apart.
1. Align the unit vertically with the barbed ports
at the bottom (alternately pointing to the left or
right).
2. Using the two 3/16" mounting holes, attach to the
ducting.
3. Using the knockout, attach a 1/2" conduit.
4. Connect wires to the screw terminals. See the
Wiring section.
Connecting Sensing Ports
NOTE: A sampling probe should be located
a minimum of 1.5 duct diameters
downstream from the air source. Install the
sampling probe as close to the center of the
airstream as possible.
NOTE: For sample lines of up to 10 feet, 1/4" OD
tubing is acceptable. For lines up to 20 feet,
use 1/4" ID tubing. For lines up to 60 feet,
use 1/2" ID tubing.
To attach a sampling line:
• To a CSE-110
2
with barbed connections, use 1/4
to 3/8" (6 to 9 mm) tubing for air sampling lines
and connect the tubing to the appropriate port(s).
• To a CSE-110
3
with compression connections,
connect 1/4" OD copper to the compression
fitting(s).
Connect the sampling lines according to the applica-
tion:
• Positive Pressure Only:
Connect the sample line
to inlet H. (Inlet L remains open to the atmo-
sphere.)
• Negative Pressure Only:
Connect the sample line
to inlet L. (Inlet H remains open to the atmo-
sphere.)
• Two Negative Samples:
Connect the higher
negative sample to inlet L. Connect the lower
negative sample to inlet H.
• Two Positive Samples:
Connect the higher posi-
tive sample to inlet H. Connect the lower positive
sample to inlet L.
• One Positive and One Negative Sample:
Con-
nect the positive sample to inlet H. Connect the
negative sample to inlet L.
Mounting
1
Connecting Sensing Ports 1
Optional HFO-001x Sensor Probe 2
Wiring
2
Setpoint Adjustment 2
Maintenance
2
(CSE-1103 Shown)
