Compact Low Differential Pressure Switches

Compact Low Differential Pressure Switches
034_Layout 1 7/8/14 9:44 AM Page 34
PRESSURE
Series
1900
Compact Low Differential Pressure Switches
Set Points from 0.07 in to 20 in w.c. Repetitive Accuracy within 3%
1/8 FEMALE NPT
HIGH PRESS. CONNECTION
60° TYP
(2) Ø3/16 [4.76]
MOUNTING HOLES
ON A 4-3/16 [106.36] B.C.
Differential Pressure Switches
3
[76.20]
1-5/16
[33.32]
TYP
Ø3-1/2
[88.90]
41/64
Series 1910 switch with conduit [16.27]
enclosure off. Shows electric
switch and set point adjustment
screw located on same side for
easy installation.
Scan here
to watch
product video
Ø7/8 [22.23] 51/64
[20.24]
CONDUIT
CONNECTION
1-19/32
[40.48]
2-11/32
[59.53]
1-7/8
[47.63]
2-9/32
[57.94]
2-7/16
[61.90]
1-3/4 [44.45]
CLEARANCE
FOR COVER REMOVAL
The Dwyer-engineered force-motion amplifier increases the leverage of diaphragm
movement and results in a switch with excellent sensitivity and repeatability.
Our most popular series combines advanced design and precision construction to make
these switches able to perform many of the tasks of larger, costlier units. Designed for air
conditioning service, they also serve many fluidics, refrigeration, oven and dryer
applications. For air and non combustible compatible gases, Series 1900 switches have set
points from 0.07 to 20 in w.c. (1.8 to 508 mm). Set point adjustment is easy with range
screw located inside conduit enclosure. Internal location helps prevent tampering. UL,
CE, CSA listed, and FM approved.
Series 1910 Switches
Operating Ranges, Deadbands
Approximate
Operating Dead Band
Range,
At Min.
Model in w.c.
Set Point
1910-00 0.07 to 0.15 0.04
1910-0 0.15 to 0.55 0.10
1910-1 0.40 to 1.6 0.15
1910-5 1.40 to 5.5 0.30
1910-10 3.0 to 11.75 0.40
1910-20 4.0 to 20.0 0.40
1/8 FEMALE NPT
LOW PRESSURE
CONNECTION
At Max.
Set Point
0.04
0.10
0.16
0.30
0.40
0.50
SPECIFICATIONS
Service: Air and non-combustible,
compatible gases.
Wetted Materials: Consult factory.
Temperature Limits: -30 to 180°F (-34
to 82.2°C).
Pressure Limits: 45 in w.c. (11.2 kPa)
continuous, 10 psig (68.95 kPa) surge.
Switch Type: Single-pole double-throw
(SPDT).
Repeatability: ±3%.
Electrical Rating: 15 A @ 120-480
VAC, 60 Hz. Resistive 1/8 HP @125
VAC, 1/4 HP @ 250 VAC, 60 Hz.
Derate to 10 A for operation at high
cycle rates.
5 7/16 [138.1]
4 3/4 [120.7]
4
[101.6]
Electrical Connections: 3 screw type,
common, normally open and normally
closed.
Process Connections: 1/8˝ female
NPT.
Mounting Orientation: Diaphragm in
vertical position. Consult factory for
other position orientations.
Set Point Adjustment: Screw type
inside conduit enclosure.
Weight: 1lb, 4.5 oz (581 g).
Agency Approvals: CE , CSA, FM,
and UL. Optional-EXPL explosion-proof
enclosure does not possess any
agency approvals.
WEATHERPROOF ELECTRIC CONNECTION HUB
SRU-TITE #ST-1-1/2 PIPE SIZE
1 1/8
[28.58]
7/8 [22.22]
2
[50.80]
OPTION
Manual reset Model 1900 MR includes special snap switch which latches on
pressure increase above the setpoint. Switch must be manually reset after pressure
drops below the setpoint. To order, change base model to 1900 and add MR suffix
after range number. Example: 1900-10-MR. Available on -1, -5,-10 or -20 ranges
only. Option is not UL, CSA or FM listed
LO
OPEN
NORMALLY
CLOSED
P R
3
[76.20]
1 1/4
Ø5/16 [Ø7.938]
[31.75]
3/4
[19.05]
3/4 [19.05]
3/32 [2.381]
3 [76.20]
LOW PRESSURE
HIGH PRESSURE
3
1/8 [79.38]
CONNECTION 1/8 N.P.T.
CONNECTION 1/8 N.P.T.
Weatherproof Housing
16 ga. steel enclosure with gasketed cover (NEMA 4, IP66) for wet or oily
conditions. Withstands 200 hour salt spray test. Wt. 5 Ib (2.3 kg). Switch must be
factory installed. Change 1910 base number to 1911 and add -WP suffix.
Example: 1911-1-WP.
6-1/2 [165.10]
CLEARANCE FOR
COVER
REMOVAL
4X Ø.281
[7.14]
1/2 NPT PROCESS
CONNECTION
2X 4-1/4
[107.95] 2X 6-1/8
[155.58]
Note: Manual Reset (MR) Option for use only in single positive pressure applications.
ACCESSORIES
A-399, Duct Pressure Monitor Kit — For use with standard or manual reset model
switches. Includes mounting flange, tubing and adapters.
A-329, Street Ell — Brass adapter for applications requiring right angle connections.
Two required for differential pressures.
A-302F-A, 303 SS Static Pressure Tip with mounting flange. For 3/16˝ ID rubber or
plastic tubing. 4˝ insertion depth. Includes mounting screws
A-489, 4˝ Straight Static Pressure Tip with Flange
COMMON
NORMALLY
HI
P R
1/8 FEMALE NPT
HIGH PRESSURE
CONNECTION
1/8 FEMALE NPT
LOW PRESSURE
CONNECTION
3X 1-1/16
[26.99]
3 [76.20]
6-5/8
[168.28]
Explosion-Proof Housing
Cast iron base with brass cover. Rated Class I, Groups D; Class II, Div. 2, Groups
E, F, G; Class III and NEMA 7, 9 NEMA 3. (7 lb). Switch must be factory installed.
Change model to 1911 and add -EXPL suffix.
Example: 1911-1-EXPL
Process Tubing Options: See page 547 (Gage Tubing Accessories)
34
DWYER INSTRUMENTS, INC. | www.dwyer-inst.com
Find Quality Products Online at:
www.
GlobalTestSupply.com
[email protected]
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