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Dwyer 3000MRS Photohelic Switch/Gauge 0 to 20 CM

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Dwyer 3000MRS Photohelic Switch/Gauge 0 to 20 CM

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

Thread
No external process connection

Seal Material
Buna-N

Outer Size
Panel face diameter approx. 120 mm

Grade
Industrial

Display
Analog

Sensor Type
Photohelic Pressure Switch/Gauge

Material
ABS Plastic housing, Polycarbonate lens

Dial Material
Aluminum with printed scale

Pointer Material
Anodized aluminum

Processing Type
Injection Molded

Diameter
120 mm (Face)

Glass Size
105 mm (Viewing area)

Mount Type
Panel Mount

Scale Range
0 to 20 cm WC (Water Column)

Accuracy
2% of full scale

Finishing
Black ABS plastic housing

Measure Pressure Of
Air and compatible gases

Accessories
Mounting bracket, Installation hardware, User manual

Weight
Approx. 580 grams

Switch Type
Photohelic electronic switches (2 SPDT relay outputs)

Compliance
CE certified

Electrical Rating
5A @ 120/240 VAC

Response Time
Fast-acting relay switching

Input Pressure Connections
1/8" female NPT (High and Low)

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

Power Supply
120 VAC, 50/60 Hz

Enclosure Protection
IP54 (front face)

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

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

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

Main Domestic Market
All India

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

Dwyer 3000MRS Photohelic Switch/Gauge 0 to 20 CM

Series 3000MR/3000MRS Photohelic® Switch/Gage

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

Model	Description
3000MRS-20 CM	Pressure Switch/Gage,Range 0 - 20 CM, .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

Advanced Dual-Function Gauge and Control

The 3000MRS integrates both pressure measurement and control in a single device, combining analog visual feedback with fast-acting electronic switching. With two SPDT relay outputs and an accurate 2% full scale reading, this Photohelic unit streamlines monitoring and station automation for air or compatible gas systems.

Industrial-Strength Design

Manufactured with injection-molded ABS plastic housing and a durable polycarbonate lens, the 3000MRS is built to perform reliably in demanding industrial settings. The IP54 front face rating shields the gauge from dust and splashing, while CE certification confirms compliance with international safety and performance standards.

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

Q: How is the Dwyer 3000MRS Photohelic Switch/Gauge installed?

A: The 3000MRS is designed for easy panel mounting. It comes with a mounting bracket and hardware, allowing straightforward integration into control panels. A user manual is included to guide proper installation and electrical connection to the 1/8" NPT female input ports.

Q: What type of pressure can the 3000MRS measure?

A: This device measures the pressure of air and compatible gases in the range of 0 to 20 cm WC (water column), making it suitable for various HVAC, filter monitoring, and process control applications.

Q: When should the relay outputs be used?

A: The dual SPDT relay outputs should be used when automatic switching, control, or alarming is necessary based on set pressure thresholds. The fast-acting relays respond quickly to pressure changes, enhancing process safety and automation.

Q: Where is the best environment to use the 3000MRS?

A: Thanks to its IP54-rated front face, robust ABS housing, and operating temperature range of -6.67 to 60C, the 3000MRS is suitable for industrial environments where accurate pressure control and durability are vital.

Q: What are the benefits of using a photohelic pressure switch/gauge?

A: Photohelic switches combine the functions of a precise analog gauge and reliable electronic switching, reducing installation complexity, saving space, and providing both monitoring and control in one resilient device.

Q: How accurate is the Dwyer 3000MRS and what ensures this performance?

A: The 3000MRS offers 2% full-scale accuracy for dependable measurements. Its analog dial, robust construction, and strict manufacturing standards, including CE certification, guarantee consistent and precise operation.

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