Dwyer Instruments SERIES 1900 Catalog Page

SERIES 1900

COMPACT LOW DIFFERENTIAL PRESSURE SWITCHES

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

PRESSURE

41/64

[16.27]

Series 1910 switch with conduit enclosure off.

Shows electric switch and set point adjustment screw located

Our most popular Series 1900 Compact Low Differential Pressure Switches combine 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 uidics, refrigeration, oven and dryer applications.

Series 1900 switches have set points from 0.07 to 20 in 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. For use with air or compatible gages.

FEATURES/BENEFITS

• Compact size and repeatability, provides a high-value switch for many industrial and OEM applications

• Wide range of models from 0.07 in w.c. to 20 in w.c. can meet exacting OEM

specications for a low pressure switch

• Range screw protected inside enclosure provides simplies making adjustments but

prevents tampering

APPLICATIONS

• Air conditioning refrigeration coil icing detection; defrost cycle initiation

• Clogged lter detection

• Variable air volume controller

MODEL CHART

Model 1910-00 1910-0 1910-1 1910-5 1910-10 1910-20

ACCESSORIES Model Description A-399

A-329

A-302F-A

A-489

on same side for easy installation.

Operating Range in w.c.

0.07 to 0.15

0.15 to 0.5

0.40 to 1.6

1.40 to 5.5

3.0 to 11.75

4.0 to 20.0

Duct pressure monitor kit; for use with standard or manual reset

model switches; includes mounting ange, tubing and adapters

Street ell; brass adapter for applications requiring right angle connections; two required for differential pressures

303 SS static pressure tip with mounting ange; for 3/16˝ ID rubber or plastic tubing; 4˝ insertion depth; includes mounting

screws

4˝ straight static pressure tip with ange

Approximate Deadband At Min. Set Point

0.04

0.10

0.15

0.30

0.40

At Max. Set Point

0.04

0.10

0.16

0.30

0.40

0.50

1-19/32

[40.48]

diaphragm movement and results in a switch with excellent sensitivity and repeatability.

HIGH PRESS. CONNECTION

2-11/32

[59.53]

The Dwyer-engineered force-motion amplier increases the leverage of

1-3/4 [44.45]

CLEARANCE

FOR COVER REMOVAL

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 in 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.

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 Ib (2.5 kg). Switch must be factory installed.

Note: To order, change 1910 base number to 1911, add -WP sufx. Example: 1911-1-WP Explosion-Proof Housing

Cast iron base with brass cover. Rated Class I, Groups D; Class II, Div. 2, Groups E, F, G; Class III and NEMA 7, 9 NEMA 3. (7 lb). Switch must be factory installed.

Note: To order, change 1910 base number to 1911, add -EXPL sufx. Example: 1911-1-EXPL Manual Reset Option (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. Available on -1, -5,-10 or -20 ranges only. Option is not UL, CSA or FM listed. For use only in single positive pressure applications.

Note: To order, change 1910 base number to 1900, add -MR sufx. Example: 1900-10-MR

Manual reset option

USA: California Proposition 65 WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

1/8 FEMALE NPT

[76.20]

1-5/16 [33.32]

TYP

Ø3-1/2 [88.90]

Ø7/8 [22.23] CONDUIT CONNECTION

51/64

[20.24]

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,

and UL. Optional-EXPL explosion-proof enclosure does not possess any agency approvals.

Process Tubing Options: See page 455 (Gage Tubing Accessories)

1-7/8

[47.63] 2-9/32

[57.94]

2-7/16 [61.90]

60° TYP

(2) Ø3/16 [4.76] MOUNTING HOLES ON A 4-3/16 [106.36] B.C.

1/8 FEMALE NPT LOW PRESSURE CONNECTION

DWYER INSTRUMENTS, INC. |

Differential Pressure Switches