Series 1950 Explosion-proof Differential Pressure Switch

Compact, Low Cost, Explosion-proof and Weatherproof

Series 1950 Explosion-Proof Differential Pressure Switch combines the best features of the popular Dwyer® Series 1900 Pressure Switch with an integral explosion-proof and weatherproof housing, making it an exceptional value for either application. It is CE, UL and CSA listed, FM approved for use in Class I, Div 1, Groups C and D, Class II Groups E, F, and G and Class III hazardous atmospheres (NEMA 7 & 9), Raintight NEMA 3 (IP54). Weatherproof features include a drain plug and O-ring seal in cover. Electrical connections are easily made by removing front cover. For convenience the set point adjustment screw is located on the outside of the housing. Twelve models offer set points from .03 to 20 in w.c. (0.0075 to 5 kPa) and from .5 to 50 psi (0.035 to 3.5 bar). The unit is very light and compact — about half the weight and bulk of other explosion-proof or weather-proof switches with separate enclosures.

CAUTION: For use only with air or compatible gases. Applications with hazardous atmospheres and a single positive pressure may require special venting.

Product Applications

HVAC applications
Process applications
All-weather applications

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Models & Ordering

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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

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Model	Description	Usually Ships*	Price	Order
1950-0-2F Ships: 9-10 Weeks Price: $311.00	Differential pressure switch, range .15-.50" w.c., approx. deadband @ min. set point 0.10, approx. deadband @ max. set point 0.15.	9-10 Weeks*	$311.00	Order
1950-00-2F Ships: 9-10 Weeks Price: $311.00	Differential pressure switch, range .07-.15" w.c., approx. deadband @ min. set point 0.04, approx. deadband @ max. set point 0.05.	9-10 Weeks*	$311.00	Order
1950-1-2F Ships: 9-10 Weeks Price: $311.00	Differential pressure switch, range .4-1.6" w.c., approx. deadband @ min. set point 0.15, approx. deadband @ max. set point 0.20.	9-10 Weeks*	$311.00	Order
1950-10-2F Ships: 9-10 Weeks Price: $311.00	Differential pressure switch, range 3-11" w.c., approx. deadband @ min. set point 0.40, approx. deadband @ max. set point 0.50.	9-10 Weeks*	$311.00	Order
1950-20-2F Ships: 9-10 Weeks Price: $311.00	Differential pressure switch, range 4-20" w.c., approx. deadband @ min. set point 0.40, approx. deadband @ max. set point 0.60.	9-10 Weeks*	$311.00	Order
1950-5-2F Ships: 9-10 Weeks Price: $311.00	Differential pressure switch, range 1.4-5.5" w.c., approx. deadband @ min. set point 0.30, approx. deadband @ max. set point 0.40.	9-10 Weeks*	$311.00	Order

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Specifications

Service:: Air and non-combustible, compatible gases.
Wetted Materials:: Consult factory.
Temperature Limits:: -40 to 140°F (-40 to 60°C); 0 to 140°F (-17.8 to 60°C)for 1950P-8, 15, 25, and 50. -30 to 130°F (-34.4 to 54.4°C) for 1950-02.
Pressure Limits:: Continuous: 1950's - 45" w.c. (0.11 bar); 1950P's - 35 psi (2.41 bar); 1950P-50 only - 70 psi (4.83 bar). Surge: 1950's - 10 psi (0.69 bar); 1950P's - 50 psi (3.45 bar); 1950P-50 only - 90 psi (6.21 bar).
Enclosure Rating:: NEMA 3 (IP54), NEMA 7 and 9.
Switch Type:: Single-pole double-throw (SPDT).
Electrical Rating:: 15 A @ 125, 250, 480 VAC, 60 Hz. Resistive 1/8 HP @ 125 VAC, 1/4 HP @ 250 VAC, 60 Hz.
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 on top of housing.
Weight:: 3.25 lb (1.5 kg); 1950-02 model 4.4 lb (2 kg).
Agency Approvals:: CE, CSA, FM, UL.

Features

Explosion-proof and weatherproof housing provides device protection for outdoor use or harsh environment operation
External set point screw provides easy access that simplifies making adjustments without opening or disassembling enclosure
Easily accessible electrical connection simplifies the installation

Videos

Liquid in your Housing? How to Prevent Conduit Condensation

What is Deadband? Switch Actuation & Deactuation

Model Chart

EXAMPLE	1950	02	2	S	AT	Series 1950-02-2S-AT Explosion-proof Differential Pressure Switch, range 0.03-0.10" w.c., mica silver contact micro switch, silicone diaphragm, with aluminum tag.
SERIES	1950 1950P					Explosion-proof Differential Pressure Switch (for Inches w.c. Ranges) Explosion-proof Differential Pressure Switch (for psid Ranges)
RANGE		02 00 0 1 5 10 20 2 8 15 25 50				0.03-0.10" w.c. 0.07-0.15" w.c. 0.15-0.5" w.c. 0.4-1.6" w.c. 1.4-5.5" w.c. 3.0-11.0" w.c. 4.0-20.0" w.c. 0.5-2.0 psid 1.5-8.0 psid 3.0-15.0 psid 4.0-25.0 psid 15.0-50.0 psid
MICRO SWITCH TYPE			2 6 M			10G Mica Silver Contact 10G Phenolic Gold Contact 10G Phenolic Silver Contact
DIAPHRGM MATERIAL				B F N S V		Buna-N Fluorosilicone Neoprene (1950 only) Silicone (1950 only) Fluoroelastomer (1950 only)
OPTIONS					AT PRESET ST	Aluminum Tag Preset Stainless Steel Tag