Series 1900 Compact Low Differential Pressure Switches

Product Description

Set Points from 0.07″ to 20″ w.c., Repetitive Accuracy within 3%

Our most popular series combines advanced design and precision construction to make these switches able to perform many of the tasks of larger, costlier units. Designed for air conditioning service, they also serve many fluidics, refrigeration, oven and dryer applications. For air and non-combustible compatible gases, Series 1900 switches have set points from 0.07 to 20″ w.c. (1.8 to 508 mm). Set point adjustment is easy with range screw located inside conduit enclosure. Internal location helps prevent tampering. UL, CE and CSA listed, and FM approved.

CAUTION: FOR USE ONLY WITH AIR OR COMPATIBLE GASES.

Please see SERIES AT11910 for ATEX approved.

Product Applications

• Air conditioning refrigeration coil icing detection; defrost cycle initiation.
• Clogged filter detection.
• Variable air volume controller.

Specifications

Specifications

Service:

Air and non-combustible, compatible gases.

Wetted Materials:

Consult factory.

Temperature Limits:

-30 to 180°F (-34 to 82.2°C).

Pressure Limits:

45″ w.c. (11.2 kPa) continuous, 10 psig (68.95 kPa) surge.

Switch Type:

Single-pole double-throw (SPDT).

Repeatability:

±3%.

Electrical Rating:

15 A @ 120-480 VAC, 60 Hz. Resistive 1/8 HP @ 125 VAC, 1/4 HP @ 250 VAC, 60 Hz. Derate 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 conduit enclosure.

Weight:

1 lb 4.5 oz (581 g).

Agency Approvals:

CE, CSA, FM, UL. Optional EXPL Explosion-proof enclosure does not possess any agency approvals.

Options

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 lbs
  (2.3 kg). Switch must be factory installed. Change 1910 base number
  to 1911 and add –WP suffix. Example: 1911-1-WP.
• Explosion-proof Housing – Cast iron base with brass cover. Rated Class I, Group D;
  Class II, Groups E, F, G.
  (7 lbs). Switch must be factory installed. Change model number to 1911
  and add –EXPL suffix. Example: 1911-1-EXPL.
• Manual Reset Model 1900-MR – includes special snap switch
  which latches on pressure increase above the setpoint. Switch
  must be
  manually reset after pressure drops below the setpoint. To order
  change base model to 1900 and add MR suffix after range number.
  Example: 1900-10-MR. Available on -1, -5, -10 or -20 ranges only.
  Option is not UL, CSA or FM listed. NOTE: Manual Reset (MR) option for
  use only in single positive pressure applications.

Literature

Manuals

Instruction Manual

Catalog Pages

Series 1900 Catalog Page

Approvals

Approvals

CSA Approval-Switches
CSA Approval-Industrial Control Equipment
UL-Motor Controllers-Canada
UL-Motor Controllers-US
UL-Motor Controllers (Components)-Canada
UL-Motor Controllers (Components)-US
UL-Switches (Components)-US
CE Approval
RoHS Letter of Compliance

Drawings

Drawings

RoHS Letter of Compliance
1900 (pdf)
1900-WP (dwg)
1900-WP (pdf)
3-D Drawing for A-489

Accessories

Accessories

	Model Number	Description
	A-399	Duct pressure monitor kit, for use with standard or manual reset model switches.
	A-329	1/8″ NPT close coupled street ell, brass.
	A-489	4″ 303 SS straight static pressure tip with flange.
	A-302F-A	303SS static pressure tip with mounting flange, 4″ hook style. For 3/16″ ID rubber or plastic tubing, includes mounting screws.

FAQ

FAQ

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

Question

How can a standard 1910 pressure switch be used to sense pressure in an oven operating at 200 degrees Celsius?

Answer

Use metal tubing for sensing lines long enough to safely dissipate the heat.

Related

Series 1900