Dwyer 3000MRS Photohelic Switch/Gauge 0 to 4 kPa

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Dwyer 3000MRS Photohelic Switch/Gauge 0 to 4 kPa

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Dwyer 3000MRS Photohelic Switch/Gauge 0 to 4 kPa Specification

Sensor Type
Photohelic (Electromechanical Switch/Gauge)

Seal Material
Silicone rubber gasket

Outer Size
Standard 4 (101.6 mm) case

Bourdon Tube
Not Applicable (uses diaphragm)

Thread
1/8 NPT female connections

Grade
Industrial

Display
Analog, with pointer

Material
Die-cast aluminum case, polycarbonate window

Dial Material
White aluminum with black markings

Pointer Material
Black anodized aluminum

Processing Type
Precision mechanical movement with electrical switching

Diameter
4 inches (101.6 mm)

Glass Size
4 inches (101.6 mm) window

Mount Type
Flush mount or surface mount with accessory

Scale Range
0 to 4 kPa

Accuracy
2% of full scale

Accessories
Mounting hardware, wiring terminals, instruction manual

Enclosure Protection
IP54 (front of panel)

Mounting Orientation
Must be vertical for specified accuracy

Temperature Range
-18 to 65C (0 to 150F)

Electrical Rating
10A @ 120/240 VAC; 3A @ 28 VDC resistive

Power Supply
No auxiliary power required for gauge (switches only)

Maximum Pressure
Hydrostatic Pressure Max.: 172 kPa (25 psi)

Zero Adjustment
External, screw adjustment

Response Time
Virtually instantaneous

Weight
approx. 900 g (2 lb)

Repeating Accuracy
1% of full scale

Set Point Adjustment
External, front accessible via knobs

Switch Type
SPDT snap switches (2), field adjustable set points

Dwyer 3000MRS Photohelic Switch/Gauge 0 to 4 kPa 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 3000MRS Photohelic Switch/Gauge 0 to 4 kPa

Dwyer 3000MRS Photohelic Switch/Gauge 0 to 4 kPa

Series 3000MR/3000MRS Photohelic® Switch/Gage

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

Model	Description
3000MRS-4 kPa	Pressure Switch/Gage,Range 0-4 kPa, .10 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

Precision Pressure Monitoring and Control

Engineered for industrial use, the Dwyer 3000MRS combines precision pressure measurement and reliable switching. With a repeating accuracy of 1% and a 2% full-scale gauge accuracy, it supports critical monitoring of steam, oil, or gas processes. The external front-accessible adjustment knobs simplify both zero and set point tuning, enhancing usability and accuracy for technical environments.

Robust Construction and Versatile Installation

Built to withstand harsh conditions, this model boasts a powder-coated die-cast aluminum housing and a silicone rubber gasket for added sealing. Its IP54 front panel protection makes it suitable for plant and field installations. Flexible mounting options-flush or surface mount with the included accessory-adapt to your specific application needs, while the standard 4-inch dial ensures clear, analog readout at a glance.

FAQ's of Dwyer 3000MRS Photohelic Switch/Gauge 0 to 4 kPa:

Q: How do I adjust the switch set points on the Dwyer 3000MRS Photohelic Gauge?

A: The Dwyer 3000MRS features externally accessible knobs located on the front panel, allowing you to conveniently adjust each set point without dismantling the instrument. This makes on-site configuration and recalibration quick and straightforward.

Q: What substances can the 3000MRS Photohelic Switch/Gauge measure?

A: This model is suitable for monitoring pressure in steam, oil, or gas systems, making it ideal for a range of industrial applications where reliable low-pressure control is required.

Q: When does the device require a power supply?

A: No separate power supply is needed for the pressure gauge function. However, the snap-action SPDT switches require power only for switching operations, making the device energy efficient and simplifying installation.

Q: Where should I install the Dwyer 3000MRS for optimal accuracy?

A: For best accuracy, mount the gauge vertically as specified by the manufacturer. This orientation ensures precise pressure readings and reliable switch operation as per its calibrated design.

Q: What is the process for zero point adjustment?

A: Zero adjustment is accomplished externally through a screw adjustment mechanism on the front of the unit, allowing users to maintain calibration without dismantling the panel or removing the gauge.

Q: How does the IP54 enclosure benefit my application?

A: The IP54-rated front panel provides protection against dust and water splashes, safeguarding internal components and ensuring reliable operation even in demanding industrial environments.

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