Advanced design and precision
construction permit
these switches 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 use with air and non-combustible gases.
Series 1900 switches are available with set points of 0.07
to 20 inches water column. Set point adjustment can be
made easily - before or after installation. Range screw is
inside conduit enclosure to help prevent tampering. For
easy mounting and access, pressure and electrical con-
nections and set point adjustment are located on one
side. This permits installation in corners or spaces too
small for other switches.
SPECIAL MODELS & ACCESSORIES
Special close coupled street elbow for right angle pres-
sure connections. Can be installed on switch anytime.
Zinc plated aluminum.
Series 1900 Pressure Switch
Specifications - Installation and Operating Instructions
Bulletin E-56
SPECIFICATIONS
Service:
Air and non-combustible, compatible gases.
Wetted Materials:
Consult Factory.
Temperature Limits:
-30 to 180°F (-34 to 82.2°C) (32°F
for non dry air).
Pressure Limits:
45˝ 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.
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, UL, CSA, FM.
ATEX: For ATEX compliant model change the Series Number
to 1911 and add a “-CN” suffix. These versions follow Directive
94/9/EC ATEX compliant for II 2 G EEx d IIB T6.
NOTE:
For ATEX units wire in accordance with local electrical
codes. Cable should enter enclosure housing through an
approved EX cable gland (not supplied).
Series 1910 pressure switch. All
pressure and electrical connec-
tions and set point adjustments
are on one side for easy installa-
tion.
Series 1910 switch with conduit
enclosure off. Shows electric
switch and set point adjustment
screw.
The Dwyer-engineered force-motion amplifier increases the
leverage of diaphragm movement and results in a switch with
excellent sensitivity and repeatability.
41/64
[16.27]
1-19/32
[40.48]
2-11/32
[59.53]
Ø7/8 [22.23]
CONDUIT
CONNECTION
1-3/4 [44.45]
CLEARANCE
FOR COVER
REMOVAL
3
[76.20]
Ø3-1/2
[88.90]
60 TYP
1/8 FEMALE NPT
HIGH PRESS.
CONNECTION
1-5/16
[33.32]
TYP
2-7/16 [61.90]
2-9/32
[57.94]
1-7/8
[47.63]
(2) Ø3/16 [4.76]
MOUNTING HOLES
ON A 4-3/16 [106.36] B.C.
1/8 FEMALE NPT
LOW PRESSURE
CONNECTION
51/64
[20.24]
DWYER INSTRUMENTS, INC.
Phone: 219/879-8000
www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, IN 46361, U.S.A.
Fax: 219/872-9057
e-mail: [email protected]
Model
Number
Operating
Range,
Inches W.C.
Approximate
Dead Band
At Min.
Set Point
At Max.
Set Point
1910-00
1910-0
1910-1
1910-5
1910-10
1910-20
0.04
0.10
0.15
0.30
0.40
0.40
0.04
0.10
0.16
0.30
0.40
0.50
0.07 to 0.15
0.15 to 0.55
0.40 to 1.6
1.40 to 5.5
3.0 to 11.75
4.0 to 20.0
SERIES 1910 SWITCHES — MODELS OPERATING
RANGES, DEADBANDS
Weatherproof Housing
16 ga. steel enclosure with gasketed
cover (NEMA 4) for wet or oily condi-
tions. Withstands 200 hour salt spray
test. Wt. 5 Ibs. (2.3 kg). Switch must
be factory installed. Change 1910
base number to 1911 and add -WP
suffix. Example: 1911-1-WP.
Explosion-Proof Housing
NEMA 7, 9 NEMA 3. (7 lbs). Switch
must be factory installed. Change
model to 1911 and add -EXPL suffix.
Example: 1911-1-EXPL. Aluminum
base and cover rated Class I, Groups
C & D, Div. 1. Class II, Groups E, F, &
G, Div. 1.
4 [101.6] SQ.
7/8
[22.23]
3/4
[19.05]
3/4 [19.05]
4-3/4
[120.65]
5-1/2
[139.7]
HIGH PRESS.
CONN. 1/8 N.P.T.
LOW PRESS.
CONN. 1/8 N.P.T.
2 [50.8]
3 [76.2]
(4) 5-16 [7.94] DIA.
MTG. HOLES
WEATHERPROOF ELECTRIC
CONNECTION HUB
1/2
⬙
NPT FEMALE
1-1/8
[28.58]
1-1/4 [31.75]
3/32
[2.38]
3 [76.2]
3-1/8 [79.38]
2-3/4
6-1/2 [165.10]
CLEARANCE FOR
COVER REMOVAL
1/2 NPT PROCE
SS
CONNECTION
3X 1-1/16
[26.99]
6-5/8 [168.28]
3 [76.20]
2X 4-1/4
[107.95]
2X 6-1/8
[155.58]
1/8 FEMALE NPT
LOW PRE
SS
URE CONNECTION
4X Ø.281 [7.14]
1/8 FEMALE NPT
HIGH PRE
SS
URE CONNECTION
E-56 ATEX:E-56atex 2/11/10 10:04 AM Page 1
1.800.868.7495
QualityInstruments-Direct
.ca
