The Series SSS-1000 Lightweight Averaging Flow
Sensor from Dwyer Instruments, Inc. is ideal for sensing
differential pressure in the inlet section of variable air volume
terminal units and fan terminal units. They can also be used
to sense differential pressure at other locations in the main,
or branch duct systems.
The “H” port senses total pressure and the “L” port senses
static pressure. The difference between these signals is the
differential, or velocity pressure.
Models offer up to four sensing points and lengths of 3-
5/32˝ to 9-29/32˝ (8.02 to 25.26 cm) to accommodate box
size diameters of 4˝ to 16˝ (10.16 to 40.64 cm).
INSTALLATION
The Series SSS-1000 utilizes 1/4˝ I.D. tubing for 3/8˝ O.D.
tubing. First check that there are no sharp bends in the tub-
ing at any connection. Bends and creases may leak over
time as the tubing ages.
Connect the “H” Port to the high input on the differential
pressure gage, transmitter, or switch.
Connect the “L” Port to the low input on the differential
pressure gage, transmitter, or switch.
Series SSS-1000 Lightweight Averaging Flow Sensor
Specifications - Installation and Operating Instructions
Bulletin SSS-1000
DWYER INSTRUMENTS, INC.
Phone: 219/879-8000 www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com
SPECIFICATIONS
Service: Air and compatible gases.
Wetted Materials: ABS/Polycarbonate (UL94-5V).
Temperature Limits: Operating: 40 to 120°F (4 to 49°C);
Storage: -40 to 140°F (-40 to 60°C).
Connection: 1/4˝ (6 mm) I.D. tubing for 3/8˝ (10 mm) O.D.
tubing.
Mounting Orientation: Integral flange with gasket.
Weight: 1 oz (28 g).
CONNECTION CURVE
3-1/2
[88.90]
2-3/4
[69.85]
1-1/4
[57.15]
PUSH-ON
CONNECTIONS
FOR 3/8 OD
POLY TUBING
[9.53 OD]
FOAM GASKET
1/4 THK
[6.35 THK]
A
Model
SSS-1002
SSS-1003
SSS-1004
SSS-1005
Length (A)
3-5/32˝ (80.17 mm)
5-13/32˝ (137.32 mm)
7-21/32˝ (195.47 mm)
9-29/32˝ (252.62 mm)
DIMENSIONS
.80
.70
.60
.50
.40
.30
.20
.10
0
1000
2000
3000
ΔP INCHES H2O
VELOCITY - FEET PER MINUTE
SSS-1002
SSS-1003
SSS-1004 &
SSS-1005
SSS-1000:SSS-1000 8/13/09 11:08 AM Page 1
©Copyright 2009 Dwyer Instruments, Inc. Printed in U.S.A. 7/09 FR# R1-443361-00 Rev. 3
DWYER INSTRUMENTS, INC.
Phone: 219/879-8000 www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com
MOUNTING
1. Install the unit horizontally to assure accurate velocity
readings.
2. Determine the duct’s flow direction and install the Series
SSS-1000 based on the unit’s flow arrow imprint.
3. Cut a 7/8˝ hole in the ducting to accept the unit.
4. Attach using two self-tapping screws inserted in the 3/16˝
mounting holes.
MOUNTING DETAILS
MAINTENANCE
Sensing orifices must be kept free of dust accumulation or
debris.
The Series SSS-1000 Lightweight Averaging Flow Sensors
are not field repairable. If you wish to return a unit contact
customer service to receive a return goods authorization
number before shipping.
Bulletin SSS-1000
1-3/8˝
[35]
1-3/8˝
[35]
7/8˝ [22] DIA
CLEARANCE HOLE
(2) 3/16 DIA HOLE FOR
SELF TAPPING SCREWS
SSS-1000:SSS-1000 8/13/09 11:08 AM Page 2
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