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 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 stud permits mounting 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 AT21823 for ATEX approved.

Product Applications

Process applications
Mechanical equipment control

Models & Ordering

Shipping Information

All shipping times are dependent on product availability at time of shipment.

Although we make every effort to ensure a continuous supply of our products, occasional circumstances may force us to temporarily run out of a product, or have shipping delays. Should this occur, customers will be notified soon after placement of any orders for such products and, if applicable, items will be put on backorder. For orders requiring expedited shipment, our customer service team can be contacted to confirm product availability

Build Your Custom Part. Use our Product Configurator

Model	Description	Usually Ships*	Price	Order
1823-0 Ships: Next Day Price: $67.00	Differential pressure switch, range 0.15-.5" w.c., approx. deadband @ min. set point 0.06, approx. deadband @ max. set point 0.06.	Next Day*	$67.00	Order
1823-00 Ships: Next Day Price: $70.50	Differential pressure switch, range 0.07-0.22" w.c., approx. deadband @ min. set point 0.05, approx. deadband @ max. set point 0.05.	Next Day*	$70.50	Order
1823-1 Ships: Next Day Price: $67.00	Differential pressure switch, range 0.3-1.0" w.c., approx. deadband @ min. set point 0.08, approx. deadband @ max. set point 0.08.	Next Day*	$67.00	Order
1823-10 Ships: Next Day Price: $67.00	Differential pressure switch, range 2.0-10" w.c., approx. deadband @ min. set point 0.18, approx. deadband @ max. set point 0.45.	Next Day*	$67.00	Order
1823-2 Ships: Next Day Price: $67.00	Differential pressure switch, range 0.5-2.0" w.c., approx. deadband @ min. set point 0.10, approx. deadband @ max. set point 0.12.	Next Day*	$67.00	Order
1823-20 Ships: Next Day Price: $67.00	Differential pressure switch, range 3-22" w.c., approx. deadband @ min. set point 0.35, approx. deadband @ max. set point 0.70.	Next Day*	$67.00	Order
1823-40 Ships: Next Day Price: $67.00	Differential pressure switch, range 5-44" w.c., approx. deadband @ min. set point 0.56, approx. deadband @ max. set point 1.10.	Next Day*	$67.00	Order
1823-5 Ships: Next Day Price: $67.00	Differential pressure switch, range 1.5-5.0" w.c., approx. deadband @ min. set point 0.14, approx. deadband @ max. set point 0.28.	Next Day*	$67.00	Order
1823-80 Ships: Next Day Price: $67.00	Differential pressure switch, range 9-85" w.c., approx. deadband @ min. set point 1.30, approx. deadband @ max. set point 3.0.	Next Day*	$67.00	Order

Can't find what you need? Build Your Custom Part. Use our Product Configurator

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

Features

Compact size and repeatability, provides a high-value switch for many industrial applications
Designed for panel and wall mounting and provides easy access that simplifies making adjustments or changes to switch setting
Wide range of models from 0.07 in w.c. to 85 in w.c. can meet exacting specifications for a low pressure switch

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.

Accessories

Model Number	Description	Usually Ships*	Price	Order
A-389	Mounting bracket, 16 ga steel, zinc plated and Dichromate dipped for corrosion resistance.	Next Day	$6.50	Order
A-489	4" 303 SS straight static pressure tip with flange.	Next Day	$6.67	Order
A-491	6" straight SS static pressure tip with mounting flange.	Next Day	$6.67	Order
A-493	8" straight SS static pressure tip with mounting flange.	Next Day	$7.50	Order
A-302F-B	303 SS Static pressure tip with mounting flange, for 3/16" rubber or plastic tubing. 6" insertion depth, includes mounting screws	Next Day	$12.75	Order
A-302F-C	303 SS Static pressure tip with mounting flange, for 3/16" rubber or plastic tubing. 8" insertion depth, includes mounting screws	Next Day	$14.50	Order
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	Next Day	$9.20	Order

Videos

No Contact! When to Use Gold Contact Switches

What is Deadband? Switch Actuation & Deactuation

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

Product Literature

Manuals

Instruction Manual

Catalog Pages

Approvals

Drawings

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 Literature tab on the Series 1800 web page. Beyond that, we would recommend contacting Dwyer’s technical support team at 219-879-8000.

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