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Dwyer 3000MRS Photohelic Switch/Gauge 0 to 6 MM

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Dwyer 3000MRS Photohelic Switch/Gauge 0 to 6 MM

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Dwyer 3000MRS Photohelic Switch/Gauge 0 to 6 MM Specification

Sensor Type
Photohelic Differential Pressure Sensor

Display
Analog with Dual Set Point Relay Switch

Grade
Industrial

Outer Size
Standard 4 (101 mm) bezel diameter

Thread
1/8 NPT female connections

Bourdon Tube
Not Applicable (utilizes diaphragm sensing element)

Seal Material
Silicone Rubber

Material
Die-cast aluminum case

Dial Material
White PVC with black and red markings

Pointer Material
Red anodized aluminum

Processing Type
Precision-engineered, Factory calibrated

Diameter
101 mm (4 inches) Nominal

Glass Size
101 mm (4 inches)

Mount Type
Flush / Surface Mount

Scale Range
0 to 6 mm (water column)

Accuracy
2% of full scale

Finishing
Powder Coated Front Bezel with Clear Acrylic Cover

Measure Pressure Of
Air and compatible gases

Accessories
Mounting hardware included, Instruction Manual, Panel mounting bracket

Dwyer 3000MRS Photohelic Switch/Gauge 0 to 6 MM Trade Information

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

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

Main Domestic Market
All India

About Dwyer 3000MRS Photohelic Switch/Gauge 0 to 6 MM

Dwyer 3000MRS Photohelic Switch/Gauge 0 to 6 MM

Series 3000MR/3000MRS Photohelic® Switch/Gage

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

Model	Description
3000MRS-6 MM	Pressure Switch/Gage,Range 0 - 6 MM, .20 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 Industrial Application

The Dwyer 3000MRS Photohelic Switch/Gauge is designed for industrial-grade monitoring and control of air and compatible gases. Its robust die-cast aluminum construction and clear acrylic cover offer lasting durability. The gauges versatility enables both flush and surface mounting, fitting seamlessly in various environments where differential pressure measurement is critical.

Instantaneous and Accurate Measurement

Equipped with a diaphragm sensing element, the 3000MRS provides an immediate mechanical response and relay activation within 50 ms, supporting precise process control. Its analog display and dual relay set points enable users to visually monitor and automate systems, ensuring process safety and efficiency with 2% accuracy.

User-Friendly Setup and Operation

Front-adjustable set point knobs, easily accessed under the cover, allow for straightforward configuration without disassembly. The included mounting accessories, instruction manual, and panel bracket facilitate fast installation, while the photohelic sensors factory calibration ensures users can rely on consistent, accurate readings right out of the box.

FAQs of Dwyer 3000MRS Photohelic Switch/Gauge 0 to 6 MM:

Q: How do I adjust the set point on the Dwyer 3000MRS Photohelic Switch/Gauge?

A: To adjust the set points, simply remove the front cover to access the adjustment knobs. Rotate the knobs to your desired set point values, then replace the cover for normal operation. This procedure allows for precise on-site customisation without the need for disassembly.

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

A: The Dwyer 3000MRS is engineered to measure the differential pressure of air and compatible gases only. It is not suitable for measuring liquids or corrosive gases that may damage the silicone rubber seals or diaphragm sensing element.

Q: When should I use a Photohelic switch/gauge instead of a standard pressure gauge?

A: Use the 3000MRS Photohelic when monitoring and controlling pressure in automated processes is essential. Its dual set point relays allow it to function as both a gauge and a control switch, ideal for applications requiring immediate response and system integration.

Q: Where is the ideal installation location for this gauge?

A: The gauges IP52-rated front and panel mounting options make it suitable for indoor industrial environments, such as process control panels or HVAC systems. For optimal performance, mount it flush or on a surface where it is protected from water sprays and extreme dust infiltration.

Q: What is the electrical requirement and relay configuration for the 3000MRS?

A: Depending on model, the 3000MRS operates on 24 or 120 VAC and features two SPDT electromechanical relays, each rated for 5A at 120/240 VAC. This makes it adaptable for integration with a wide variety of control systems.

Q: How does the instantaneous mechanical response benefit users?

A: The near-instantaneous mechanical response with relay operations under 50 milliseconds allows for real-time process protection and rapid system adjustments, reducing the risk of damage or downtime in critical industrial environments.

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