Dwyer 3030MRS Photohelic Switch/Gauge 0 to 30 inch

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Dwyer 3030MRS Photohelic Switch/Gauge 0 to 30 inch

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Dwyer 3030MRS Photohelic Switch/Gauge 0 to 30 inch Specification

Bourdon Tube
Not Applicable (uses diaphragm sensing)

Outer Size
126 mm (5 in) dia. case

Display
Analog with Dual Set Point Switches

Sensor Type
Photohelic Differential Pressure Sensor

Thread
1/8 NPT Female

Grade
Industrial

Seal Material
Buna-N

Material
Die-cast aluminum case, acrylic cover

Dial Material
Printed Plastic

Pointer Material
Anodized Aluminum

Processing Type
Photoelectric/Electro-mechanical

Diameter
5 inches (126 mm)

Glass Size
126 mm (5 inch) diameter viewing area

Mount Type
Flush, Surface or Panel Mountable

Scale Range
0 to 30 inches of water column (in. w.c.)

Accuracy
2% of full scale

Accessories
Surface mounting bracket, hardware kit, and instruction manual

Switch Type
SPDT snap action - 2 adjustable set points

Power Supply
None required for switching; dry contact outputs

Temperature Range
20 to 120F (-6.67 to 48.9C)

Enclosure Rating
IP52

Electrical Rating
10A @ 120/240 VAC, 28 VDC

Pressure Connections
High and low pressure ports, 1/8" NPT Female

Weight
About 2 lbs (0.91 kg)

Model
3030MRS

Dwyer 3030MRS Photohelic Switch/Gauge 0 to 30 inch Trade Information

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

Main Export Market(s)
Asia

Main Domestic Market
All India

About Dwyer 3030MRS Photohelic Switch/Gauge 0 to 30 inch

Dwyer 3030MRS Photohelic Switch/Gauge 0 to 30 inch

Series 3000MR/3000MRS Photohelic® Switch/Gage

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

Model	Description
3030MRS-30 inch	Pressure Switch/Gage,Range 0-30 inch, 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

Industrial Differential Pressure Control

The Dwyer 3030MRS excels in measuring and controlling differential pressure in steam, oil, or gas systems. With robust die-cast aluminum construction and an IP52 enclosure rating, it is engineered for reliability and protection in demanding industrial environments. The analog display and dual setpoint switching provide at-a-glance status and automatic control to maintain process safety.

Simple Installation and Operation

Designed for flexibility, this Photohelic switch/gauge can be flush-mounted, panel-mounted, or surface-mounted. It comes with a mounting bracket, hardware kit, and clear instruction manual. The 1/8" NPT female ports allow straightforward integration into existing systems, while the dry contact switches operate without an external power supply, making setup hassle-free.

Precision and Versatility

With an accuracy of 2% of full scale and an easy-to-read 5-inch analog dial, the 3030MRS offers reliable pressure readings every time. Two independently adjustable SPDT snap-action switches enable customizable control, making it ideal for various industrial control and safety applications requiring timely response and consistent performance.

FAQ's of Dwyer 3030MRS Photohelic Switch/Gauge 0 to 30 inch:

Q: How does the Dwyer 3030MRS Photohelic Switch/Gauge operate without a power supply?

A: The Dwyer 3030MRS uses dry contact SPDT snap-action switches that require no external power for switching. The photoelectric and electro-mechanical design utilizes the diaphragm sensing pressure differential to trigger the switches, providing outputs suitable for most control applications.

Q: What types of fluids can this gauge measure pressure for?

A: This model is suitable for measuring differential pressure in steam, oil, and gas systems, making it a versatile choice for a range of industrial applications involving pressurized mediums.

Q: When should the two adjustable set points be used?

A: The dual adjustable SPDT switches allow users to set upper and lower pressure thresholds. These set points can be configured to trigger alarms or control devices, making them essential for process safety and automation when monitoring critical pressure ranges.

Q: Where can the 3030MRS be installed?

A: The 3030MRS is designed for easy installation on panels, flush surfaces, or walls. With a 5-inch diameter case and included mounting hardware, it can be adapted to most industrial setups requiring differential pressure indication and control.

Q: What is the benefit of the IP52 enclosure rating?

A: The IP52 rating ensures that the 3030MRS is protected against dust and limited water ingress, providing added durability and reliability in industrial environments where exposure to particulates and occasional drips is possible.

Q: How is the accuracy of pressure measurement ensured?

A: The 3030MRS Photohelic gauge achieves an accuracy of 2% of full scale. Its precision diaphragm sensing and photoelectric mechanism are engineered to provide consistent and dependable pressure readings.

Q: What accessories are supplied with the 3030MRS?

A: Each unit includes a surface mounting bracket, a comprehensive hardware kit, and a detailed instruction manual for hassle-free installation and operation.

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