Skip to the beginning of the images gallery

Series 1900 Compact Low Differential Pressure Switches

Series 1800 Low Differential Pressure Switch for General Industrial Service

Set Points from 0.07" to 85" w.c. Repetitive Accuracy within 2%

Essential for industrial environments, the Series 1800 Low Differential Pressure Switch for general industrial service combines small size and low price with 2% repeatability for all but the most demanding applications. Set point adjustment inside the mounting stud permits mounting the switch on one side of a wall or panel with adjustment easily accessible on the opposite side. UL and CSA listed, and FM approved.

CAUTION: FOR USE ONLY WITH AIR OR COMPATIBLE GASES.

Please see Series AT-1800 for ATEX approved.

Product Applications

Process applications
Mechanical equipment control

Starting at $109.20

Ordering

Grouped product items
Model	Description	Availability*	Price
1823-0	Differential pressure switch, range 0.15-.5" w.c., approx. deadband @ min. set point 0.06, approx. deadband @ max. set point 0.06.	1-3 days*	$109.20
1823-00	Differential pressure switch, range 0.07-0.22" w.c., approx. deadband @ min. set point 0.05, approx. deadband @ max. set point 0.05.	1-3 days*	$114.55
1823-1	Differential pressure switch, range 0.3-1.0" w.c., approx. deadband @ min. set point 0.08, approx. deadband @ max. set point 0.08.	1-3 days*	$109.20
1823-10	Differential pressure switch, range 2.0-10" w.c., approx. deadband @ min. set point 0.18, approx. deadband @ max. set point 0.45.	1-3 days*	$109.20
1823-2	Differential pressure switch, range 0.5-2.0" w.c., approx. deadband @ min. set point 0.10, approx. deadband @ max. set point 0.12.	1-3 days*	$109.20
1823-20	Differential pressure switch, range 3-22" w.c., approx. deadband @ min. set point 0.35, approx. deadband @ max. set point 0.70.	1-3 days*	$109.20
1823-40	Differential pressure switch, range 5-44" w.c., approx. deadband @ min. set point 0.56, approx. deadband @ max. set point 1.10.	1-3 days*	$109.20
1823-5	Differential pressure switch, range 1.5-5.0" w.c., approx. deadband @ min. set point 0.14, approx. deadband @ max. set point 0.28.	1-3 days*	$109.20
1823-80	Differential pressure switch, range 9-85" w.c., approx. deadband @ min. set point 1.30, approx. deadband @ max. set point 3.0.	1-3 days*	$109.20

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.
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).
Compliance:: CE, CSA, FM, UL. NOTE: Optional (-EXPL) Explosion-proof Enclosure does not possess any agency approvals.

Features

Compact size and repeatability provide a high-value switch for many industrial applications
Designed for panel and wall mounting to easily meet mounting requirements in most industrial settings
Pressure ranges from 0.07 in w.c. to 85 in w.c. make this switch suitable for a wide range of applications

Options

Weatherproof Housing - 16-ga. steel enclosure with gasketed cover (NEMA 4, IP66) for wet or oily conditions. Withstands 200 hour salt spray test. Wt. 5-1/2 lbs. (2.5 kg). Switch must be factory installed. Change 1823 base number to 1824 and add -WP suffix. Example: 1824-1-WP.
Explosion-proof Housing - Cast iron base with aluminum cover. Rated Class I, Group D; Class II, Div. 1 & 2, Groups E,F,G; Class III and NEMA 7 C,D, NEMA 9 E,F,G. Wt. 7-1/2 lbs. (3.4 kg). Switch must be factory installed. Change base number to 1824 and add -EXPL suffix. Example: 1824-1-EXPL.
MIL Environmental Construction - Unlisted Model 1820 can be furnished with a special sealed snap switch for protection against high humidity, fungus and/or military applications. Similar to Model 1823 except dead band is slightly greater and some lower set points may not be possible. To order, add suffix -MIL. Example: 1820-2-MIL.

Support Library

Product Literature

Manuals

Instruction Manual

Catalog Pages

Series 1800 Catalog Page

Product Data Sheet

1800

Approvals

Drawings

Model Chart

EXAMPLE	1820	00	AT	Series 1820-00-AT Low Differential Pressure Switch, range 0.07-0.22" w.c., with aluminum tag.
SERIES	1820 1823 1824			Low Differential Pressure Switch Low Differential Pressure Switch with Conduit Low Differential Pressure Switch without Conduit
RANGE		00 0 1 2 5 10 20 40 80		0.07-0.22" w.c. 0.15-0.5" w.c. 0.3-1.0" w.c. 0.5-2.0" w.c. 1.5-5.0" w.c. 2.0-10.0" w.c. 3.0-22.0" w.c. 5.0-44.0" w.c. 9.0-85.0" w.c.
OPTIONS			AT B BGAP EXPL GOLD LC MIL MR PRESET SF ST WP	Aluminum Tag Buna-N Elastomers B-Gap Micro Switch Cast Iron Explosion-proof Housing Gold Contact Switch Less Conduit MIL Switch Manual Reset Preset Silicone Free (includes Buna-N Elastomers) Stainless Steel Tag Weatherproof Housing

FAQ

Questions

Question

Do you have a troubleshooting guide for the 1823-80?

Answer

We have the Instruction manual which comes with the unit or can be found under the Support Library tab on the Series 1800 web page. Beyond that, we would recommend contacting Dwyer’s technical support team.

Related

Series 1800

Question

Will a Dwyer pressure switch be damaged if the pressure exceeding the maximum set-point is applied to the switch?

Answer

No. Not unless the maximum pressure rating of the switch is exceeded.

Related

Series A-3000

Series PDPS

Series 3000MR/3000MRS

Series ADPS/EDPS

Series 1900

Series 1800

Reviews

Write Your Own Review

Only registered users can write reviews. Please Sign in or create an account

Accessories

Model	Description	Availability*	Price
A-302F-A	303 SS Static pressure tip with mounting flange, for 3/16" I.D. rubber or plastic tubing. 4" insertion depth, includes mounting screws	1-3 days*	$12.40
A-302F-B	303 SS Static pressure tip with mounting flange, for 3/16" rubber or plastic tubing. 6" insertion depth, includes mounting screws	1-3 days*	$17.00
A-302F-C	303 SS Static pressure tip with mounting flange, for 3/16" rubber or plastic tubing. 8" insertion depth, includes mounting screws	1-3 days*	$19.35
A-389	Mounting bracket, 16 ga steel, zinc plated and Dichromate dipped for corrosion resistance	1-3 days*	$10.90
A-489	4" 303 SS straight static pressure tip with flange, 1/4" hose barb.	1-3 days*	$9.50
A-491	6" straight SS static pressure tip with mounting flange, 1/4" hose barb.	1-3 days*	$9.50
A-493	8" straight SS static pressure tip with mounting flange, 1/4" hose barb.	1-3 days*	$9.90