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 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

Build Your Custom Part. Use our Product Configurator

Model Description Usually Ships Price Order
1823-0
Ships: Next Day
Price: $65.00
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 $65.00 Order
1823-00
Ships: Next Day
Price: $68.00
Differential pressure switch, range 0.07-0.22" w.c., approx. deadband @ min. set point 0.05, approx. deadband @ max. set point 0.05. Next Day $68.00 Order
1823-1
Ships: Next Day
Price: $65.00
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 $65.00 Order
1823-10
Ships: Next Day
Price: $65.00
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 $65.00 Order
1823-2
Ships: Next Day
Price: $65.00
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 $65.00 Order
1823-20
Ships: Next Day
Price: $65.00
Differential pressure switch, range 3-22" w.c., approx. deadband @ min. set point 0.35, approx. deadband @ max. set point 0.70. Next Day $65.00 Order
1823-40
Ships: Next Day
Price: $65.00
Differential pressure switch, range 5-44" w.c., approx. deadband @ min. set point 0.56, approx. deadband @ max. set point 1.10. Next Day $65.00 Order
1823-5
Ships: Next Day
Price: $65.00
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 $65.00 Order
1823-80
Ships: Next Day
Price: $65.00
Differential pressure switch, range 9-85" w.c., approx. deadband @ min. set point 1.30, approx. deadband @ max. set point 3.0. Next Day $65.00 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
Mounting bracket, 16 ga steel, zinc plated and Dichromate dipped for corrosion resistance. A-389 Mounting bracket, 16 ga steel, zinc plated and Dichromate dipped for corrosion resistance. Next Day $6.50 Order
4 A-489 4" 303 SS straight static pressure tip with flange. Next Day $6.67 Order
6 A-491 6" straight SS static pressure tip with mounting flange. Next Day $6.67 Order
8 A-493 8" straight SS static pressure tip with mounting flange. Next Day $7.50 Order
303 SS Static pressure tip with mounting flange, for 3/16 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
303 SS Static pressure tip with mounting flange, for 3/16 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
303 SS Static pressure tip with mounting flange, for 3/16 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

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

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.
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.

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