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Dwyer 3000MR Photohelic,Switch/Gauge 0 to 4kpa

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Dwyer 3000MR Photohelic,Switch/Gauge 0 to 4kpa

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Dwyer 3000MR Photohelic,Switch/Gauge 0 to 4kpa Specification

Bourdon Tube
Not Applicable (uses diaphragm sensing element)

Thread
1/8 NPT Female Connection

Display
Analog with Photohelic (electromechanical relay) Switch

Sensor Type
Differential Pressure Sensor

Grade
Industrial

Outer Size
Bezel diameter approx. 4-1/2 inch (115 mm)

Seal Material
Buna-N (standard) gaskets

Material
Cast aluminum case, polycarbonate window

Dial Material
White background with black markings

Pointer Material
Black, high-contrast molded polymer

Processing Type
Photoelectric switching with analog gauge

Diameter
4-1/2 inch (115 mm) nominal

Glass Size
Bezel face, approx. 4-1/2 inch

Mount Type
Panel Mount

Scale Range
0 to 4 kPa

Accuracy
2% of full scale

Finishing
Powder-coated, corrosion-resistant finish

Measure Pressure Of
Air and compatible non-combustible gases

Accessories
Mounting ring, snap ring, and terminal screws included

Dwyer 3000MR Photohelic,Switch/Gauge 0 to 4kpa Trade Information

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

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

Main Domestic Market
All India

About Dwyer 3000MR Photohelic,Switch/Gauge 0 to 4kpa

Dwyer 3000MR Photohelic,Switch/Gauge 0 to 4kpa

Series 3000MR/3000MRS Photohelic® Switch/Gage

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

Model	Description
3000MR-4kpa	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

Advanced Differential Pressure Monitoring

The Dwyer 3000MR Photohelic combines the reliability of an analog gauge with the precision of photoelectric switching. This ensures rapid response and accurate measurement of air or compatible gas differentials, all while enabling precise control using its dual SPDT relays. Its robust construction and corrosion-resistant finish offer durability in harsh industrial environments.

Intuitive Operation & Installation

Engineered for ease of use, this device features a large, clear display with high-contrast markings for quick pressure readings. The included mounting ring, snap ring, and terminal screws simplify panel mounting and installation. Its 1/8 NPT female connections accommodate standard fittings, making setup straightforward for most industrial systems.

Benefits for Industrial Applications

Built to withstand tough conditions, the 3000MR Photohelics cast aluminum case, Buna-N seals, and polycarbonate window ensure longevity and resistance to corrosion. Instantaneous response time aids in maintaining process safety and efficiency, while its analog-and-switch design offers both continuous monitoring and automated control in a single unit.

FAQs of Dwyer 3000MR Photohelic,Switch/Gauge 0 to 4kpa:

Q: How do I install the Dwyer 3000MR Photohelic Switch/Gauge?

A: The unit is designed for panel mounting and includes a mounting ring, snap ring, and terminal screws for secure installation. Connect the 1/8" NPT female ports to your pressure lines, provide a 120 VAC power supply, and wire the SPDT relays as needed for your application.

Q: What type of gases can be measured with this device?

A: The Dwyer 3000MR Photohelic is intended for use with air and compatible non-combustible gases. Ensure that the gases do not contain corrosive elements that could damage the wetted materials (brass, phos. bronze, Buna-N, polycarbonate, aluminum).

Q: When should the SPDT relay switches be used?

A: The dual SPDT relays are used when you need automated control capabilities, such as activating alarms or equipment when a pressure setpoint is reached. The relays operate at 5A for 120/240 VAC or 28 VDC circuits.

Q: Where can I use the Dwyer 3000MR in an industrial setting?

A: This gauge is suitable for anywhere accurate air or compatible gas differential pressure measurement and control are requiredsuch as HVAC systems, clean rooms, filter monitoring, or industrial process equipment. Its robust construction makes it ideal for demanding environments.

Q: What is the process for setting the pressure setpoints?

A: Setpoints are adjusted directly on the gauge, allowing the relays to actuate precisely at your chosen differential pressure levels. Adjust the setpoint dials according to your systems requirements and confirm relay switching at the desired pressures.

Q: What are the main benefits of using a Photohelic switch/gauge?

A: Combining real-time analog readout with automated switching provides both visibility and control in one device. The instantaneous gauge response and precise relay operation enhance process safety and efficiency, reducing the need for separate instruments.