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

Thread
1/8 NPT Female Connections

Outer Size
Approx. 130 mm (5-1/8 in) diameter front flange

Bourdon Tube
Not Applicable (Diaphragm based)

Sensor Type
Photohelic Differential Pressure Sensor

Grade
Industrial

Seal Material
Neoprene

Display
Analog with Setpoint LEDs

Material
Die Cast Aluminum Case

Dial Material
White Aluminum with Black Markings

Pointer Material
Precision Balanced Aluminum

Processing Type
Pressure Sensing and Control

Diameter
130 mm (front flange)

Glass Size
Clear Acrylic Lens, Approx. 100 mm

Mount Type
Flush or Surface Mount

Scale Range
0 to 50 mm

Accuracy
2% of Full Scale

Accessories
Mounting Bracket, Terminal Screws, Manual

Operating Temperature Range
-18C to 60C (0F to 140F)

Electrical Rating
5 A @ 120/240 VAC

Switch Type
SPDT (Single-Pole Double-Throw), 2 setpoints

Enclosure Rating
Front IP52 (protection against limited dust ingress and dripping water)

Panel Cutout Size
114 mm (4-1/2 in) diameter

Compliance
CE Marked

Application
Filter Monitoring, Fan Control, Duct Static Pressure

Set Point Adjustment
External, via knobs on dial face

Contact Type
Gold-plated relay contacts

Power Supply
Not required for mechanical gauge operation (switching uses relay contacts)

Response Time
Instantaneous (mechanical)

Maximum Pressure
10 psi (0.7 bar)

Weight
Approx. 680g (1.5 lbs)

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

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

Main Export Market(s)
Asia

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

Versatile Differential Pressure Monitoring

The Dwyer 3000MRS Photohelic is engineered for industrial applications, delivering accurate monitoring and control for a variety of processes. Its external setpoint adjustment and robust SPDT relay option make it especially suitable for filter status indication and automatic duct fan control.

Easy Installation and Reliable Design

Featuring a flush or surface mount configuration and supplied mounting bracket, the 3000MRS installs securely into standard panel cutouts. The textured black matte housing, clear acrylic lens, and die-cast aluminum case provide lasting performance in demanding operating environments.

Efficient Control Without Extra Power

This gauge doesn't require an additional power supply for standard pressure measurement; switching operations utilize integral relay contacts. Gold-plated relay contacts and external setpoint adjustment ensure precise, instant control activation for a wide range of system automation tasks.

FAQ's of Dwyer 3000MRS Photohelic Switch/Gauge 0 to 50 MM:

Q: How does the Dwyer 3000MRS Photohelic gauge operate without an external power supply?

A: The mechanical pressure measurement function of the 3000MRS does not require any external power; the gauge operates via diaphragm-based sensing. Switch outputs are handled through gold-plated relay contacts, also not needing external power for switching small loads.

Q: What applications are suitable for the 3000MRS Photohelic?

A: This model is well-suited for monitoring and controlling filter status, fan operation, and static pressure in ducts. Its industrial-grade build and high accuracy make it ideal for systems handling steam, oil, and gas in process industries.

Q: When should I adjust the setpoints on the Photohelic gauge, and how is it done?

A: Adjust the setpoints any time your system's control requirements change. The two setpoints are configured externally using knobs located on the dial face, allowing for quick and easy field changes without removing the gauge from service.

Q: Where can the 3000MRS be installed?

A: It can be flush or surface-mounted in control panels using the included bracket. The gauge is designed to fit standard 114 mm (4-1/2 in) diameter cutouts and has a front IP52 enclosure rating for protection against limited dust and dripping water.

Q: What is the benefit of having gold-plated relay contacts in the switch?

A: Gold-plated relay contacts ensure reliable and long-lasting electrical switching by preventing corrosion and reducing contact resistance, even in demanding industrial environments.

Q: How do I use the analog display and setpoint LEDs for system monitoring?

A: The analog display provides a clear, continuous reading of differential pressure, while integrated setpoint LEDs indicate when measured pressure crosses user-defined thresholds, facilitating prompt system adjustments or automated control.

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