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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

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

Sensor Type
Photohelic (Switch/Gauge)

Display
Analog

Thread
1/8 NPT (Female)

Seal Material
Neoprene

Outer Size
Standard panel mount size

Bourdon Tube
Not applicable (uses diaphragm sensing)

Grade
Industrial

Material
Die-cast aluminum case, polycarbonate lens

Dial Material
Polycarbonate window with printed dial

Pointer Material
High contrast plastic

Processing Type
Precision-molded housing

Diameter
102 mm (4 dial)

Glass Size
Full view dial window, approx. 4 (102 mm)

Mount Type
Flush,panel mount

Scale Range
0 to 4 kPa

Accuracy
2% of full scale

Finishing
Black Polycarbonate Front Bezel

Measure Pressure Of
Air and compatible gases

Accessories
Mounting hardware, Instruction manual

Weight
Approx. 652 g (1.44 lbs)

Pressure Connection
1/8" NPT Female (High & Low)

Switch Rated Capacity
5 A @ 120/240 VAC

Installation
Panel mount with included hardware

Switch Type
SPDT relays (2 setpoints)

Model
3000MRS-4-KPA

Power Requirement
None for gauge, line voltage for switches

Repeatability
±1% of full scale

Response Time
Immediate, mechanical movement

Enclosure Rating
NEMA 2 (IP52)

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

Electrical Connection
Screw terminals

Set Point Adjustment
External, with knobs

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

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

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

Reliable Pressure Monitoring and Switching

Equipped with a photohelic sensor, the 3000MRS-4-KPA enables both indication and automatic control of air/gas pressures. Its analog dial facilitates full-view visibility, while immediate response time and 1% repeatability of full scale foster accuracy and confidence in critical industrial tasks.

Durable Construction for Industrial Use

With a robust die-cast aluminum case and black polycarbonate bezel, the Dwyer 3000MRS ensures optimal performance in demanding environments. The IP52-rated enclosure and flush panel-mount options give it versatility for a variety of installations, enhancing longevity and safety.

User-Friendly Setpoint Adjustments

External adjustment knobs on the front of the meter allow operators to quickly and accurately modify setpoint values as process needs change. The included mounting hardware and instruction manual simplify panel integration and on-site setup.

FAQs of Dwyer 3000MRS Photohelic Switch/Gauge 0 to 4 kPa:

Q: How is the set point adjusted on the Dwyer 3000MRS-4-KPA?

A: Set point adjustment is performed externally using the two knobs located on the devices front panel, allowing quick and precise modification of both relay setpoints without disassembling the unit.

Q: What are the electrical requirements for the switch and gauge functions?

A: The gauge portion of the 3000MRS-4-KPA operates without external power, while the integrated SPDT relay switches require connection to line voltage to function, supporting 5A at 120/240 VAC.

Q: Where can the Dwyer 3000MRS be installed?

A: This model is intended for flush panel mounting with included hardware. Its IP52 (NEMA 2) protection rating makes it suitable for indoor industrial applications where moderate resistance to dust and dripping water is required.

Q: When should this Photohelic Switch/Gauge be used?

A: The 3000MRS-4-KPA is recommended for continuous pressure monitoring and automated control in environments like HVAC systems, cleanrooms, and process lines, especially when reliable switching and display of low-pressure gases are essential.

Q: How does the pressure sensing mechanism operate in this unit?

A: Instead of a Bourdon tube, the device uses a diaphragm sensing design to measure differential air or gas pressure with high accuracy and repeatability, immediately activating the relay switches when setpoints are reached.

Q: What benefits does the Dwyer 3000MRS-4-KPA offer?

A: It provides precise and highly repeatable switching with analog indication, robust industrial construction, ease of installation, and straightforward setpoint adjustments, making it an efficient solution for process control and safety assurance.

Q: What does the product include upon delivery?

A: Each Dwyer 3000MRS-4-KPA is supplied with all necessary mounting hardware, an instruction manual, and comes factory-finished with a black polycarbonate front bezel and high-contrast plastic pointer for clear readings.

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