Page 1
Series 1800 Low Differential Pressure Switches
1-1/8
MOUNTING SPUD
COVER REMOVAL
1-1/2 [38.10]
1-1/2 [38.10] TYP
6 [15.40]
[190.50]
CONNECTION
6-1/2 [165.10]
CONNECTION
[168.28]
®
for General Industrial Service
Bulletin E-53
Specications - Installation and Operating Instructions
Model 1823 pressure switch.
UL and CSA Listed, FM and
CENELEC approved.
One of our most popular pressure switches. Combines small size and low price with
2% repeatability for enough accuracy for all but the most demanding applications.
Set point adjustment inside the mounting switch on one side of a wall or panel with
adjustment easily accessible on the opposite side.
*Model 1823 shown; (1823 replaces 1820, 1821 and 1822 which are similar).
Environmental (MIL) Switch
Unlisted Model 1820 can be furnished with special snap switch sealed against the
environment for high humidity and/or for government applications. Similar to standard
Model 1823 except dead band is slightly greater. Specify Model 1820 (Range No.)
“MIL” in ordering.
MODEL CHART
Model
1823-00
1823-0
1823-1
1823-2
1823-5
1823-10
1823-20
1823-40
1823-80
INSTALLATION
1. Select a location free form excessive vibration and where oil or water will not drip
upon the switch. See special housings for unusual conditions.
2. While not required, positioning the pressure connections down is recommended.
Mount the switch with the diaphragm in a vertical plane. Switch with the diaphragm
in a vertical plane. Switch must be recalibrated for each change in operating
position.
3. Connect switch to source of pressure differential. Metal tubing with 1/4˝ O.D. is
recommended but any tubing system which will not restrict the air ow is
satisfactory. Note that the low pressure connection may be made to the 1/2˝ spud
at the back of the switch if desired. If so connected, drill 1/16˝ diameter holes in the
Spring Retainer ange and the head of Adjustment Screw to provide opening to the
switch interior and plug the other low pressure connection.
4. Electrical connections to the standard single pole, double throw snap switch are
provided by means of screw terminals marked “common”, “norm open”, and “norm
closed”. The normally open contacts close and the normally closed contact open
when pressure increases beyond the set point.
5. Switch loads should not exceed the maximum specied current rating of 15 amps
resistive. Switch capabilities decrease with high load inductance or rapid cycle
rates. Whenever and application involves one or more of these factors, the user
may nd it desirable to limit the switched current to 10 amps or less in the interest
of prolonged switch life.
ADJUSTMENT
1. If the switch has been factory preset, check the set-point before placing in service
to assure it has not shifted in transit.
2. If switching has not been preset or it is desired to change the point, observe the
following procedure:
a. To adjust the set point turn the slotted Adjustment Screw clockwise to increase
the set point and counterclockwise to decrease the set point.
b. The following is a recommended procedure for calibrating or checking
calibration: Use a “T” assembly with three rubber tubing leads, all as short as
possible and the entire assembly offering minimum ow restriction. Run
one lead to the pressure switch, another to a manometer of known accuracy
and appropriate range, and apply pressure through the third tube. Make nal
approach to the set point slowly. Note the manometer and pressure switch will
have different response characteristics due to different internal volumes,
lengths of tubing, oil drainage, etc. Be certain switch is checked in position it will
assume in use, i.e. vertical, horizontal, etc.
Operating Range,
in w.c.
0.07 to 0.22
0.15 to 0.5
0.3 to 1.0
0.5 to 2.0
1.5 to 5.0
2.0 to10
3 to 22
5 to 44
9 to 85
Approximate Dead Band
At Min.
Set Point
0.05
0.06
0.08
0.10
0.14
0.18
0.35
0.56
1.30
At Max.
Set Point
0.05
0.06
0.08
0.12
0.28
0.45
0.70
1.10
3.0
1-27/32
[46.83]
Ø7/8 [22.23]
CONDUIT
CONNECTION
3-39/64
[91.68]
3-1/8
[79.38]
Ø4
[101.60]
Construction and dimensions. Series 1823 pressure switches.
SPECIFICATIONS
Service: Air and non-combustible,
compatible gases.
Wetted Materials: Consult factory.
Temperature Limits: -30 to 180°F (-34
to 82.2°C). 1823-00, -20 to 180°F (-28.9
to 82.2°C).
Pressure Limits: 10 psig (68.95 kPa)
continuous, 25 psig (172.4 kPa) surge.
Switch Type: Single-pole double-throw
(SPDT).
Repeatability: ±2%.
Electrical Rating: 15 A @ 120-480 VAC,
60 Hz. Resistive 1/8 HP @125 VAC, 1/4
HP @ 250 VAC, 60 Hz. De-rate to 10 A
for operation at high cycle rates.
4 [101.60]
TYP
SQ
1/2 FEMALE
NPT CONDUIT
CONNECTION
Weatherproof Enclosure
16 ga. steel enclosure for unusually wet or oily conditions. Withstands 200 hour salt
spray test. Gasketed cover. Weight 5-1/2 lb (2.5 kg). Switch must be installed at
factory. Specify “WP” in addition to switch catalog number.
4X Ø.281
[7.14]
1/8 FEMALE
NPT HIGH
PRESSURE
Explosion-Proof Housing
Cast iron base and aluminum dome cover. Approximate weight 7-1/2 lb (3.4 kg).
Specify “EXPL” in addition to switch catalog number. Rated Class I, Groups C & D,
Div. 1. Class II, Groups E, F, & G, Div. 1.
3
[76.20]
6-3/4
[171.45] TYP
7-1/2
2X 4-1/4
[107.95]
1/8 FEMALE NPT
LOW PRESSURE
CONNECTION
3/4
[19.05]
CLEARANCE FOR
1/8 FEMALE NPT
LOW PRESSURE
CONNECTION
Ø5/16 [7.94]
MOUNTING
HOLES TYP
CLEARANCE FOR
COVER REMOVAL
2X 6-1/8
[155.58]
2-3/32
[53.18]
2-1/8
[53.98]
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 mounting spud.
Weight: 1 lb, 5 oz (595 g).
Agency Approvals: CE, UL, CSA, FM.
4 PLACES
3-27/32
[97.63]
3/4
[19.05]
CLEARANCE FOR
COVER REMOVAL
4-1/6
[103.19]
6-5/8
[28.57]
1/8 FEMALE NPT
HIGH PRESSURE
CONNECTION
1-1/4 [31.75]
3/32 [2.38]
1/8 FEMALE NPT
HIGH PRESSURE
1-7/16
[36.53]
3
[76.20]
1/2 MALE NPT
1/8 FEMALE NPT
LOW PRESSURE
CONNECTION
CONNECTION
1/2 NPT
PROCESS
3X 1-1/16
[26.99]
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Phone: 219/879-8000
Fax: 219/872-9057
www.dwyer-inst.com
e-mail: info@dwyermail.com
Page 2
Serie 1800 Interruptor Para Baja
1-1/8
MOUNTING SPUD
COVER REMOVAL
1-1/2 [38.10]
1-1/2 [38.10] TYP
6 [15.40]
CONNECTION
6-1/2 [165.10]
CONNECTION
[168.28]
®
Presión Diferencial
Bulletin E-53
1-27/32
[46.83]
Ø7/8 [22.23]
CONDUIT
CONNECTION
3-39/64
[91.68]
3-1/8
[79.38]
Ø4
[101.60]
Model 1823 pressure switch. UL
and CSA Listed, FM approved.
Uno de nuestros mas populares interruptores de presión. Combina un pequeño
tamaño y bajo precio, con una repetibilidad del 2%, exactitud suciente para las
aplicaciones con mas demanda. El ajuste del punto de operación en un extremo,
permite instalar el interruptor de un lado en las pared o tablero, permitiendo acceso
al tornillo de ajuste.
Interruptor para Ambiente Húmedo (MIL)
El modelo 1820 puede ser fabricado son un sello especial a prueba de intemperie, o
para aplicaciones con alta humedad. Similar al modelo 1823, excepto que la banda
de operación es mayor.
Especique el modelo 1820 (Rango No.) “Mil” en su orden.
MODEL CHART
Model
1823-00
1823-0
1823-1
1823-2
1823-5
1823-10
1823-20
1823-40
1823-80
Especicaciones:
Interruptor de presión diferencial operado por diafragma de 4”, para activar un
interruptor de presión tipo simple polo doble tiro. El diafragma esta controlado por
un resorte calibrado que se puede ajustar para jar la presión diferencial exacta a la
cual el interruptor actuara. El movimiento del diagragma es transmitido al botón del
interruptor por un medio mecánico. Interruptor Dwyer Instruments, Inc. Catalogo No.
1823-__ __ para el rango de operación requerido.
INSTALACIÓN:
1. Seleccione una ubicación libre de vibración excesiva, en donde el agua o aceite no
entre al interruptor. Revise encapsulados especiales para aplicaciones especiales.
2. Mientras no se requiera otra, las conexión de presión inferior es recomendada.
Monte el interruptor con el diafragma en posición vertical, el interruptor debe
recalibrarse para cada cambio de posición.
3. Conecte el interruptor a la fuente de presión diferencial. Tubo metálico con
diámetro de 1/4˝ es recomendado, pero cualquier sistema de tubería que no
restrinja el ujo de aire es bueno.
4. Conexiones eléctricas estándar de los interruptores SPDT, común, NA y NC. Los
contactos cambian cuando se incrementa la presión del punto de operación.
5. La carga del interruptor no debe exceder los 15 Amp. Especicados. Las
capacidades decrecen con altas cargas inductivas y ciclos rápidos de actuación,
por lo que en estos casos los limites de corriente deben ser 10 Amp. 0 menores
para incrementar la vida del interruptor.
AJUSTES:
1. Si el interruptor ha sido calibrado en fabrica, revise el punto de operación antes de
ponerlo en servico.
2. De lo contrario, siga los siguientes pasos:
A. Para ajustar el punto de operación, gire el tornillo de calibración en sentido de
las manecillas del reloj para aumentar el valor y en contra de las manecillas del
reloj para dis minuir el valor del punto de operación.
B. Lo siguiente se recomienda para calibrar o revisar la calibración: Use una T con
tres mangueras plásticas, tan pequeñas como sean posible. Conecte una
manguera al interruptor de presión, otra al manómetro y por la tercera aplique
la presión de esta forma podrá ajustar el interruptor a la presión requerida lo
mas exacto posible.
©Copyright 2017 Dwyer Instruments, Inc. Printed in U.S.A. 5/17 FR# 440256-00 Rev. 3
Operating Range,
in w.c.
0.07 to 0.22
0.15 to 0.5
0.3 to 1.0
0.5 to 2.0
1.5 to 5.0
2.0 to10
3 to 22
5 to 44
9 to 85
Approximate Dead Band
At Min.
Set Point
0.05
0.06
0.08
0.10
0.14
0.18
0.35
0.56
1.30
At Max.
Set Point
0.05
0.06
0.08
0.12
0.28
0.45
0.70
1.10
3.0
Construction and dimensions. Series 1823 pressure switches.
SPECIFICATIONS
Service: Air and non-combustible,
compatible gases.
Wetted Materials: Consult factory.
Temperature Limits: -30 to 180°F (-34
to 82.2°C). 1823-00, -20 to 180°F (-28.9
to 82.2°C).
Pressure Limits: 10 psig (68.95 kPa)
continuous, 25 psig (172.4 kPa) surge.
Switch Type: Single-pole double-throw
(SPDT).
Repeatability: ±2%.
Electrical Rating: 15 A @ 120-480 VAC,
60 Hz. Resistive 1/8 HP @125 VAC, 1/4
HP @ 250 VAC, 60 Hz. De-rate to 10 A
for operation at high cycle rates.
4 [101.60]
TYP
SQ
1/2 FEMALE
NPT CONDUIT
CONNECTION
Encapsulado a Prueba de Intemperie
Encapsulado de acero para condiciones húmedas y/o aceitosas, soporta pruebas de
200 horas de spray salino, pesa 5-1/2 libras. El interruptor debe ser instalado en la
planta al momento de su fabricación. Especique “WP” mas el modelo del interruptor
en catalogo.
4X Ø.281
[7.14]
1/8 FEMALE
NPT HIGH
PRESSURE
Encapsulado a Prueba de Explosión
Encapsulado a base de Hierro y Aluminio, pesa aproximadamente 7-1/2 libras.
Especique “EXPL” mas modelo del interruptor en catalogo.
3
[76.20]
6-3/4
[171.45] TYP
7-1/2
2X 4-1/4
[107.95]
1/8 FEMALE NPT
LOW PRESSURE
CONNECTION
3/4
[19.05]
CLEARANCE FOR
1/8 FEMALE NPT
LOW PRESSURE
CONNECTION
Ø5/16 [7.94]
MOUNTING
HOLES TYP
4 PLACES
CLEARANCE FOR
COVER REMOVAL
2X 6-1/8
[155.58]
2-3/32
[53.18]
2-1/8
[53.98]
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 mounting spud.
Weight: 1 lb, 5 oz (595 g).
Agency Approvals: CE, UL, CSA, FM.
CLEARANCE FOR
COVER REMOVAL
3/4
[19.05]
3-27/32
[97.63]
4-1/6
[103.19]
6-5/8
[28.57]
1/8 FEMALE NPT
HIGH PRESSURE
3
[76.20]
CONNECTION
1/2 MALE NPT
1/8 FEMALE NPT
LOW PRESSURE
CONNECTION
1-1/4 [31.75]
3/32 [2.38]
1/8 FEMALE NPT
HIGH PRESSURE
CONNECTION
1-7/16
[36.53]
1/2 NPT
PROCESS
3X 1-1/16
[26.99]
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Phone: 219/879-8000
Fax: 219/872-9057
www.dwyer-inst.com
e-mail: info@dwyermail.com
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