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Dwyer 3000MRS Photohelic Switch/Gauge 0 to 50 MM

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Dwyer 3000MRS Photohelic Switch/Gauge 0 to 50 MM

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Dwyer 3000MRS Photohelic Switch/Gauge 0 to 50 MM Specification

Seal Material
Synthetic Rubber (Buna-N)

Grade
Industrial Grade

Thread
1/8 NPT Female

Bourdon Tube
Not Applicable (Diaphragm Actuated)

Sensor Type
Differential Pressure Sensor

Display
Analog with Switch Indication

Outer Size
Standard Round Housing

Material
Die-cast Aluminum Case, Acrylic Cover

Dial Material
Aluminum with White Background

Pointer Material
Red Tapered Pointer (Plastic)

Processing Type
Injection Molded Casing

Diameter
4 (101.6 mm)

Glass Size
4 Round Clear Acrylic Lens

Mount Type
Flush or Surface Mount

Scale Range
0 to 50 MM W.C.

Accuracy
2% of Full Scale

Finishing
Black Textured Finish

Measure Pressure Of
Air and Compatible Gases

Accessories
Mounting Bracket, Screws, Instruction Manual

Electrical Rating
5A at 125/250VAC, 1A at 30VDC

Compliance
RoHS, CE Marked

Operating Temperature
-7°C to 60°C (20°F to 140°F)

Enclosure Rating
NEMA 2 (IP42 Equivalent)

Application
Filter Monitoring, Fan Control, Duct Pressure Monitoring

Mounting Orientation
Vertical

Switch Type
Dual SPDT Relay Contacts (Photoelectric)

Model Number
3000MRS-50MM

Weight
Approx. 500g

Connection Ports
Two, Side-Mounted, 1/8" NPT

Response Time
Instantaneous Switching

Set Point Adjustment
External, Adjustable (Front Knob)

Power Supply
No Power Required for Gauge, Switch Operates on Line Voltage

Dwyer 3000MRS Photohelic Switch/Gauge 0 to 50 MM Trade Information

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

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

Main Domestic Market
All India

About Dwyer 3000MRS Photohelic Switch/Gauge 0 to 50 MM

Dwyer 3000MRS Photohelic Switch/Gauge 0 to 50 MM

Series 3000MR/3000MRS Photohelic® Switch/Gage

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

Model	Description
3000MRS-50 MM	Pressure Switch/Gage,Range 0 - 50 MM, 1.0 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

Dual Functionality for Precision and Automation

The Dwyer 3000MRS Photohelic Switch/Gauge seamlessly integrates high-accuracy analog differential pressure measurement with photoelectric relay switching. Users benefit from real-time gauging and automated process control in air handling or filtration systems without needing additional power for the gauge itself.

Reliable and Durable Design

Built with a die-cast aluminum housing, acrylic lens, and synthetic rubber seals, this gauge offers robust endurance for industrial environments. Its NEMA 2 (IP42) enclosure safeguards against dust and accidental splashes, ensuring consistent operation and long-lasting reliability in harsh settings.

FAQs of Dwyer 3000MRS Photohelic Switch/Gauge 0 to 50 MM:

Q: How is the set point on the Dwyer 3000MRS-50MM Photohelic Switch/Gauge adjusted?

A: The set point can be conveniently adjusted using the external front knob, allowing for precise configuration of switching thresholds without disassembling the unit.

Q: What are the typical applications for this differential pressure gauge?

A: This device is ideal for filter monitoring, fan control, and duct pressure applications in air handling systems, helping ensure proper airflow and system efficiency.

Q: When should the Dwyer 3000MRS-50MM be used in industrial environments?

A: Use this gauge whenever both accurate visual pressure monitoring and reliable pressure-based switch control are required, especially where no separate power supply for the gauge is desirable.

Q: Where can the 3000MRS-50MM be mounted for optimal operation?

A: It is designed for vertical mounting and supports both flush and surface mounting, allowing flexible installation within HVAC panels or process control enclosures.

Q: What process fluids are compatible with this instrument?

A: The gauge is suitable for measuring the pressure of air and compatible non-corrosive gases; it should not be used with liquids or aggressive gases.

Q: How does the switching function operate and what are the benefits?

A: The dual SPDT relay contacts offer instantaneous switching based on adjustable pressure thresholds, providing automatic control for fans, alarms, or system interlocks, thus enhancing operational safety and efficiency.

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