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Dwyer 3000MR Photohelic Switch/Gauge 0 to 20 CM

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Dwyer 3000MR Photohelic Switch/Gauge 0 to 20 CM

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Dwyer 3000MR Photohelic Switch/Gauge 0 to 20 CM Specification

Display
Analog Gauge

Seal Material
Neoprene Gasket

Thread
1/8 Female NPT

Grade
Industrial

Bourdon Tube
Not Applicable (Utilizes Diaphragm Sensing Element)

Sensor Type
Differential Pressure Sensor with Electromechanical Switch

Outer Size
118 mm x 118 mm x 62 mm (4-21/32 x 4-21/32 x 2-7/16)

Material
Case: Die Cast Aluminum; Window: Acrylic; Switch: SPDT Relay Contacts

Dial Material
Aluminum with Baked Enamel Finish

Pointer Material
Engineered Polymer

Processing Type
Precision Molded Housing with Corrosion-Resistant Coating

Diameter
Dial Diameter: 101 mm (4 inches)

Glass Size
Front Cover Lens: Approximately 101 mm

Mount Type
Panel Mount

Scale Range
0 to 20 cm of Water Column (CMWC)

Accuracy
2% of Full Scale

Finishing
Black Textured Finish

Measure Pressure Of
Air and Non-combustible, Compatible Gases

Accessories
Mounting Ring, Snap Ring, and Connector Plugs Included

Power Consumption
Less than 3 Watts

Set Point Adjustment
Front Accessible, External Knobs

Enclosure Rating
IP54 (Front Face When Properly Installed)

Operating Temperature Range
-6.67°C to 60°C (20°F to 140°F)

Switch Type
Photohelic SPDT Snap-Action, Magnetically Actuated

Number of Switches
2 (Dual Set-Point)

Electrical Rating
10A @ 120/240 VAC, 3A @ 28 VDC

Process Connection Location
Back (Standard), Side (Optional)

Dwyer 3000MR Photohelic Switch/Gauge 0 to 20 CM Trade Information

Payment Terms
Cash Against Delivery (CAD), Cash on Delivery (COD), Cash in Advance (CID), Cheque, Cash Advance (CA)

Main Export Market(s)
Australia, North America, South America, Eastern Europe, Middle East, Western Europe, Central America, Asia, Africa

Main Domestic Market
All India

About Dwyer 3000MR Photohelic Switch/Gauge 0 to 20 CM

Dwyer 3000MR Photohelic Switch/Gauge 0 to 20 CM

Dwyer, 3000MR-20CM Series 3000MR Photohelic Switch/Gage, Electromechanical Relays, 0-20 cm w.c.

Relay Type: Electromechanical, Range: 0-20 cm w.c.

Combines Differential Pressure Gage with Low/High Set-Points,Compact Size

Model	Description
3000MR-20 CM	Pressure Switch/Gage,Range 0-20CM, .50 minor divisions.

Description

Series 3000MR Photohelic Switch/Gage, Electromechanical Relays, 0-20 cm w.c., .50 minor divisions.

Includes

mounting ring, snap ring
18" cable assembly
(2) 3/16" tubing to 1/8" NPT adapters
(2) 1/8" NPT pipe plugs
(4) 6-32 x 1-1/4" RH machine screws (panel mounting)
(3) 6-32 x 5/16" RH machine screws (surface mounting)

he Series 3000MR Photohelic® Switch/Gage combine the functions of a precise, highly repeatable differential pressure switch with a large easy-to-read analog pressure gage employing the durable, time-proven Magnehelic® gage design. Switch setting is easy to adjust with large external knobs on the gage face. Gage reading is unaffected by switch operation - will indicate accurately even if power is interrupted. Solid state design now results in greatly reduced size and weight. Units can be flush mounted in 4-13/16" hole or surface mounted with hardware supplied. 3000MR models employ versatile electromechanical relays with gold over silver contacts - ideal for dry circuits.

Gage accuracy is ±2% of full scale and switch repeatability is ±1%. Switch deadband is one pointer width - less than 1% of full scale. Compatible with air and other non-combustible, non-corrosive gases, they can be used in systems with pressures to 25 psig.

Applications

Fan Control
Damper Control
Environmental Pollution Control

Approvals

CE Approval
GOST-R Certificate

Specification

Service	Air and non-combustible, compatible gases
Accuracy	±2% of FS at 70°F
Pressure Limits	-20" Hg to 25 psig
Temperature Limits	20 to 120°F
Process Connections	1/8 female NPT (duplicated side and back)
Size	4" dial face, 5" O.D. x 3-1/8"
Weight	1.8 lb
Switch Specifications
Switch Type	Each setpoint has 1 Form C relay (SPDT)
Relay Contacts	(resistive load) 1 Form C rated 1.0A @ 30 VDC, 0.3A @ 110 VDC or 0.5A @ 125 VAC. Gold over clad silver - suitable for dry circuits
Electrical Connections	18" cable assembly with 8 conductors
Power Requirements	24 VDC, regulated ±10%
Mounting Orientation	Diaphragm in vertical position
Set Point Adjustment	Adjustable knobs on face
Agency Approvals	CE

Precision Differential Pressure Measurement and Switching

Rely on the Dwyer 3000MR Photohelic Switch/Gauge for highly accurate differential pressure readings and two independent switching points. Its analog display and dual SPDT relay contacts ensure both visual monitoring and automated control for critical ventilation, filtration, or industrial gas processes.

Durable Construction for Demanding Applications

Built from die-cast aluminum with a black textured finish, the 3000MR features a corrosion-resistant coating and an IP54-rated front face (when properly installed), making it suitable for harsh industrial settings. The convenient panel-mount design fits seamlessly into control panels or enclosures.

Easy Front-Panel Set Point Adjustment

Adjustment of switching thresholds is simple thanks to external knobs located on the front panel, eliminating the need to access the back of the unit. This feature saves time during setup and maintenance, allowing quick response to changing process requirements.

FAQs of Dwyer 3000MR Photohelic Switch/Gauge 0 to 20 CM:

Q: How is the set point adjusted on the Dwyer 3000MR Photohelic Switch/Gauge?

A: Set points on this gauge are easily adjusted using external knobs on the front panel, providing direct access for precise tuning without having to remove or disassemble the instrument.

Q: What gases can be measured with this switch/gauge?

A: The Dwyer 3000MR is intended for use with air and other non-combustible, compatible gases. It is not suitable for hazardous or flammable gases.

Q: Where is this device typically mounted?

A: It is designed for panel mounting, with a standard back process connection. Optional side connections are available. Its rugged construction allows integration into industrial control panels.

Q: What are the main benefits of using a Photohelic switch/gauge?

A: It provides both reliable electronic switching (on/off control) and easy-to-read analog pressure measurement in a single device, streamlining process monitoring and automation in HVAC and filtration systems.

Q: When should I use the dual set-point feature?

A: Dual set points are most useful when you need to establish two distinct pressure thresholds for control or alarm purposessuch as activating equipment or signaling maintenance needs when pressure moves above or below user-defined limits.

Q: What is the electrical rating of the switches, and what kind of circuits can they control?

A: The SPDT relay contacts are rated for 10A at 120/240 VAC and 3A at 28 VDC, making them suitable for controlling a range of industrial devices, including motors, alarms, and solenoid valves.

Q: How does the enclosure rating protect the device in industrial environments?

A: The front face of the enclosure is rated IP54 when properly installed, protecting against dust and splashing water, which helps the device endure routine industrial cleaning and airborne particulates.

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