1823-1

## Dwyer ® 

## **SERIES 1800 |** LOW DIFFERENTIAL PRESSURE SWITCH 

## **FEATURES/BENEFITS** 

- **Compact size and repeatability provide a high-value switch useful in 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** 

## **APPLICATIONS** 

- Process applications 

- Mechanical equipment control 

## **DESCRIPTION** 

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. 

## **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 Connection** 3 screw type, common, normally open and normally closed. **Process Connection** 1/8˝ female NPT. **Mounting Connection** Diaphragm in vertical position. Consult factory for other position orientations. **Set Point Adjustment** Screw type inside mounting spud. **Weight** 1lb 5 oz (595 g). **Agency Approvals** CE, CSA, FM, UL. Optional –EXPL explosion-proof enclosure does not possess any agency approvals. 

**DIMENSIONS** 

**==> picture [262 x 136] intentionally omitted <==**

**----- Start of picture text -----**<br>
1-1/8<br>1-27/32 [28.57]<br>[46.83]<br>1/8 FEMALE NPT<br>Ø7/8 [22.23] HIGH PRESSURE<br>CONDUIT CONNECTION<br>CONNECTION 1/2 MALE NPT<br>3-39/64 MOUNTING SPUD<br>[91.68]<br>1/8 FEMALE NPT<br>LOW PRESSURE<br>CONNECTION<br>3-1/8 3/4<br>[79.38] [19.05] 2-3/32<br>Ø4 [53.18]<br>O [101.60] s s 2-1/8 , 3-27/32<br>[53.98] [97.63]<br>CLEARANCE FOR<br>COVER REMOVAL<br>**----- End of picture text -----**<br>


## **HOW TO ORDER** 

Use the **bold** characters from the chart below to construct a product code. 

**1820 -00 -WP** 

- **SERIES OPTIONS 1820:** Pressure switch **-AT:** Aluminum tag **1823:** Pressure switch with conduit **-B:** Buna-N elastomers **1824:** Pressure switch without conduit **-BGAP:** B-gap micro switch **RANGE** ~~—~~ **-EXPL:** Cast iron explosion-proof housing **-GOLD:** Gold contact switch 

- **-00:** 0.07-0.22 in w.c. **-LC:** Less conduit (1820 only) 

- **-0:** 0.15-0.5 in w.c. **-MIL:** MIL switch 

- **-1:** 0.3-1.0 in w.c. **-MR:** Manual reset 

- **-2:** 0.5-2.0 in w.c. **-PRESET:** Preset 

- **-5:** 1.5-5.0 in w.c. **-SF:** Silicone free (includes Buna-N elastomers) 

- **-10:** 2.0-10.0 in w.c. **-ST:** Stainless steel tag 

- **-20:** 3.0-22.0 in w.c. **-WP:** Weatherproof housing 

- **-40:** 5.0-44.0 in w.c. **-80:** 9.0-85.0 in w.c. 

## **ACCESSORIES** 

|**Model**|**Description**|
|---|---|
|**A-389**<br>**A-489**<br>**A-491**<br>**A-493**<br>**A-302F-A**<br>**A-302F-B**<br>**A-302F-C**|Mounting bracket; 16 ga. steel, zinc plated and dichromate dipped for corrosion resistance<br>4˝ straight static pressure tip with flange<br>6˝ straight static pressure tip with flange<br>8˝ straight static pressure tip with flange<br>303 SS static pressure tip with mounting flange; for 3/16˝ ID rubber or plastic tubing; 4˝ insertion depth; includes mounting screws<br>303 SS static pressure tip with mounting flange; for 3/16˝ ID rubber or plastic tubing; 6˝ insertion depth; includes mounting screws<br>303 SS staticpressure tipwith mountingflange;for 3/16˝ ID rubber orplastic tubing;8˝ insertion depth;includes mountingscrews|



## ORDER ONLINE TODAY! dwye ~~r-~~ inst ~~.~~ com/Product/Series1800 

## DWYER INSTRUMENTS, INC. 

©Copyright 2019 Dwyer Instruments, Inc. Printed in U.S.A. 11/19 DS-1800 

Important Notice: Dwyer Instruments, Inc. reserves the right to make changes to or discontinue any product or service identified in this publication without notice. Dwyer advises its customers to obtain the latest version of the relevant information to verify, before placing any orders, that the information being relied upon is current.