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Dwyer 1910-10 Compact Differential Pressure Switch, 3.0-11.75 in WC, SPDT, 15A, UL/CSA/FM

Dwyer

MSRP: $91.65
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SKU:
1910-10
Condition:
New
Availability:
66 In Stock
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Range3.0-11.75 in WC
Deadband (Min SP)0.40 in WC
Deadband (Max SP)0.40 in WC
Switch TypeSPDT, 15 A @ 120-480 VAC
Repeatability+/- 3%
Process Connection1/8 in FNPT, front-mounted
VariantStandard
CertificationsUL, CSA, FM, CE

The Dwyer 1910-10 is the standard form of Dwyer's most popular compact differential pressure switch. The 1910 has been a workhorse of the HVAC industry for decades and is specified on countless air-conditioning, refrigeration, oven, and dryer applications. It covers a setpoint range of 3.0-11.75 in WC, switches 15 A at 120-480 VAC through an SPDT relay, and is built around Dwyer's force-motion amplifier mechanism for repeatable trip performance (+/-3%) at very low actuating pressures. Service is air and other non-combustible, compatible gases only.

Best for: high-static AHU and rooftop unit monitoring, industrial process airflow proving, and variable-air-volume controller inputs. For natural-gas or hazardous-location service, see the explosion-proof Dwyer Series 1950G family. For UL508 plenum-rated installations, see the Dwyer EDPS series.
2-YEAR
WARRANTY
Manufacturer-backed coverage. Dwyer Series 1900 switches carry a two-year limited warranty against defects in materials and workmanship. ZOT Supply is an authorized Dwyer distributor; product ships factory-new with full manufacturer warranty intact and access to Dwyer technical support.

Key Features

Force-Motion Amplifier Mechanism

Dwyer-engineered internal linkage amplifies diaphragm motion, giving the snap switch more travel per unit of pressure change. Result: +/-3% repeatability even at actuating pressures as low as 0.07 in WC.

15 A Switch Rating

SPDT snap switch is rated 15 A at 120-480 VAC, 60 Hz - significantly heavier duty than typical HVAC pilot relays. Drive small motors, contactors, or alarm circuits directly without an interposing relay. Derate to 10 A for high cycle rates.

Tamper-Resistant Adjustment

Setpoint adjustment screw is located inside the conduit enclosure - removal of the snap-on cover is required to access it. Prevents accidental or unauthorized changes to the trip point in the field.

One-Side Installation

Pressure ports, electrical conduit, and setpoint adjustment are all located on the same side of the housing. The switch can be installed in corners or tight spaces where a conventional pressure switch with rear connections will not fit.

Wide Service Envelope

Operating temperature -30 to 180 F (32 F minimum for non-dry air), 80% RH non-condensing, up to 6,560 ft altitude. Continuous overpressure rated 45 in WC, 10 psig surge - tolerant of typical HVAC transients.

UL/CSA/FM/CE Listed

Series 1910 and 1920 carry multi-agency approvals: UL listed, CSA certified, FM approved, and CE marked. Installation category III (transient overvoltage); pollution degree 2. Ready for use in code-listed control panels.

Technical Specifications

SpecificationValue
Model1910-10
Operating Range3.0-11.75 in WC
Approx. Deadband at Min. Setpoint0.40 in WC
Approx. Deadband at Max. Setpoint0.40 in WC
ServiceAir and non-combustible, compatible gases (not for natural gas or other combustibles)
Wetted MaterialsConsult factory
Switch Type1 Form C relay, SPDT
Electrical Rating15 A @ 120-480 VAC, 60 Hz; resistive 1/8 HP @ 125 VAC, 1/4 HP @ 250 VAC, 60 Hz. Derate to 10 A for high cycle rates.
Repeatability+/- 3%
Electrical Connections3 screw-type terminals: common (COM), normally open (NO), normally closed (NC)
Installation CategoryIII (transient overvoltage)
Pollution Degree2
Process Connections1/8 in female NPT, front-mounted (high and low)
EnclosureStandard conduit enclosure with snap-on cover (7/8 in conduit connection)
Temperature Limits, Operating-30 to 180 F (-34 to 82.2 C); 32 F minimum for non-dry air
Humidity Limit80% RH, non-condensing
Altitude Limit6,560 ft (2,000 m) max
Pressure Limit, Continuous45 in WC (11.2 kPa)
Pressure Limit, Surge10 psig (68.95 kPa)
Mounting OrientationDiaphragm in vertical plane
Setpoint AdjustmentSlotted screw inside conduit enclosure (tamper-resistant)
Weight1 lb 4.5 oz (581 g)
ComplianceCE, UL, CSA, FM
Manufacturer Part Number1910-10

Documentation

PDFCatalog DatasheetPDFInstallation and Operating Manual (Bulletin E-56)

Frequently Asked Questions

What pressure range does the 1910-10 cover?
This SKU is the -10 range, with an adjustable setpoint of 3.0-11.75 in WC. Approximate deadband is 0.40 in WC at the minimum setpoint and 0.40 in WC at the maximum setpoint. Maximum continuous overpressure is 45 in WC (11.2 kPa); maximum surge pressure is 10 psig (68.95 kPa).
Can the 1910-10 be used outdoors or in cold environments?
The published operating range is -30 to 180 F. However, the -30 F lower limit applies only to dry air. For humid HVAC air or any service where moisture is present, the practical minimum operating temperature is 32 F - below freezing, moisture inside the switch can freeze and prevent the diaphragm from operating reliably. For wet, oily, or outdoor service, specify the -WP (weatherproof, NEMA 4) housing option from the 1911/1921 family.
Is the 1910-10 rated for natural gas or other combustible gases?
No. The Series 1900 family is rated only for air and other non-combustible, non-aggressive gases. Use with combustible media can cause operating faults or unsafe conditions. For natural gas service or installation in Class I Div 1 hazardous areas, see the explosion-proof Dwyer Series 1950G family instead.
What if I need a NEMA 4 weatherproof or explosion-proof version?
The Series 1900 family offers two factory-installed enclosure upgrades. The -WP option (e.g., 1911-1-WP) places the switch in a 16-gauge steel NEMA 4 housing for wet, oily, or outdoor service. The -EXPL option (e.g., 1911-1-EXPL) provides a cast-iron NEMA 7/9 housing rated Class I Group D and Class II Groups E/F/G for hazardous locations. Both require the bare-switch 1911 base; the switch must be factory-installed in the housing - field assembly is not supported.
What is the Dwyer force-motion amplifier and why does it matter?
The force-motion amplifier is a Dwyer-engineered internal mechanical linkage that multiplies the small motion of the pressure diaphragm into a larger motion at the snap switch lever. The practical benefit is that the switch can resolve very small pressure changes (as low as 0.07 in WC trip points) while maintaining +/-3% repeatability across many thousands of cycles. This is what lets the compact 1900 family compete on accuracy with much larger, more expensive industrial pressure switches.
How do I wire the snap switch?
Remove the snap-on conduit enclosure cover by loosening its retaining screw and pulling firmly at the bottom. Three screw terminals are exposed: COM (common), NO (normally open), and NC (normally closed). On rising pressure past the setpoint, COM transfers from NC to NO. Wire COM to your input/load common, and use NO for fail-safe-open logic or NC for fail-safe-closed logic. The 7/8 in conduit connection accepts standard 1/2 in NPT conduit fittings with the supplied adapter. Always de-energize before wiring.
Brand:
Dwyer
Series:
1900
Sub-Family:
1910
Product Type:
Compact Differential Pressure Switch
Operating Range:
3.0-11.75 in WC
Range Code:
-10
Deadband at Min Setpoint:
0.40 in WC
Deadband at Max Setpoint:
0.40 in WC
Service:
Air, Noncombustible Gases (not natural gas)
Switch Type:
SPDT, 1 Form C Relay
Reset Type:
Automatic
Electrical Rating:
15 A at 120-480 VAC, 60 Hz
Repeatability:
+/- 3%
Process Connection:
1/8 in FNPT, Front
Conduit Connection:
7/8 in (1/2 in NPT compatible)
Conduit Enclosure:
Standard, with snap-on cover
Pressure Limit (Continuous):
45 in WC, 11.2 kPa
Pressure Limit (Surge):
10 psig, 68.95 kPa
Temperature Range:
-30 to 180 F, -34 to 82.2 C (32 F min for non-dry air)
Humidity Limit:
80% RH non-condensing
Altitude Limit:
6,560 ft, 2,000 m
Installation Category:
III
Pollution Degree:
2
Mounting Orientation:
Diaphragm Vertical
Setpoint Adjustment:
Slotted screw inside enclosure (tamper-resistant)
Certifications:
CE, UL, CSA, FM
Weight:
1 lb 4.5 oz, 581 g
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