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Dwyer 3000MRS Photohelic Switch/Gauge 0 to 100 MM

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Dwyer 3000MRS Photohelic Switch/Gauge 0 to 100 MM

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Dwyer 3000MRS Photohelic Switch/Gauge 0 to 100 MM Specification

Display
Analog with Mechanical Pointer

Seal Material
Buna-N

Sensor Type
Photohelic Differential Pressure Sensor

Outer Size
110 mm (Approximate Outer Diameter)

Grade
Industrial

Thread
1/8 NPT Female

Material
Die-cast Aluminum Case, Acrylic Window

Dial Material
Acrylic

Pointer Material
Aluminum

Processing Type
Precision Engineered

Diameter
110 mm (Bezel OD)

Glass Size
Approx. 100 mm

Mount Type
Flush or Panel Mount

Scale Range
0 to 100 MM (Millimeters of Water)

Accuracy
2% of Full Scale

Finishing
Powder Coated/Anodized Housing

Measure Pressure Of
Air and Compatible Gases

Accessories
Mounting Hardware, Operation Manual, Electrical Connectors

Dwyer 3000MRS Photohelic Switch/Gauge 0 to 100 MM 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, South America, Eastern Europe, Middle East, Western Europe, Africa, Central America, Asia, North America

Main Domestic Market
All India

About Dwyer 3000MRS Photohelic Switch/Gauge 0 to 100 MM

Dwyer 3000MRS Photohelic Switch/Gauge 0 to 100 MM

Series 3000MR/3000MRS Photohelic® Switch/Gage

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

Model	Description
3000MRS-100 MM	Pressure Switch/Gage,Range 0-100 MM, 2.0 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

Versatile Switch/Gauge for Industrial Pressure Applications

The Dwyer 3000MRS Photohelic Switch/Gauge offers precise differential air pressure measurements with robust switching capability. Its adjustable dual SPDT switches enable effective automation in monitoring filters, blowers, and clean rooms, among other applications. Designed for flush or panel mounting, it fits seamlessly into new or existing control systems.

Durable Construction and Reliable Operation

Crafted from die-cast aluminum with a powder-coated or anodized finish and acrylic viewing window, the 3000MRS stands up to demanding environmental conditions. Its IP54 rating ensures resistance to dust and water splashes. The mechanical, power-free operation guarantees dependability, even during power outages.

Easy Installation and Comprehensive Accessories

Each unit comes complete with mounting hardware, electrical connectors, and an in-depth operation manual, making the installation process straightforward. The 1/8 NPT female threads and 110 mm bezel diameter allow for standard panel integration, while the analog pointer ensures at-a-glance readings for rapid diagnostics.

FAQs of Dwyer 3000MRS Photohelic Switch/Gauge 0 to 100 MM:

Q: How does the Dwyer 3000MRS Photohelic Switch/Gauge operate without external power?

A: The Dwyer 3000MRS functions mechanically to measure pressure differences, requiring no external power. Its analog display uses a mechanical pointer, while setpoint switches are actuated through the measured pressure itself.

Q: What is the benefit of dual SPDT snap-acting switches in the 3000MRS?

A: Dual SPDT switches allow independent setting of two actuation points, enabling flexible alarm, control, or automation functions like filter status indication or blower activation based on differential pressure thresholds.

Q: Where can the Dwyer 3000MRS Photohelic Gauge be installed?

A: This gauge can be flush or panel mounted, making it suitable for control panels, HVAC filter banks, blower monitoring setups, or clean rooms in industrial and laboratory environments.

Q: When is it recommended to use this gauge in air velocity or filter monitoring applications?

A: Use the 3000MRS when you need real-time, reliable differential pressure monitoring and want automated alerts or system responses for air filters, ventilation systems, or clean-room air management.

Q: What gases can be measured with this device?

A: The device measures air and compatible non-corrosive gases. Its Buna-N seals and acrylic window ensure safety and compatibility with standard HVAC and process air applications.

Q: How accurate and repeatable are the measurements with the 3000MRS?

A: The gauge offers an accuracy of 2% of full scale and repeatability within 0.5%, providing consistent, dependable readings needed for critical industrial monitoring tasks.

Q: What accessories are included with the 3000MRS Photohelic Switch/Gauge?

A: The device is supplied with mounting hardware, an operation manual, and electrical connectors, ensuring you have everything necessary for a straightforward installation and setup process.

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