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Dwyer 3000MRS-0 Photohelic Switch/Gauge 0 to 0.5 inch

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Dwyer 3000MRS-0 Photohelic Switch/Gauge 0 to 0.5 inch

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Dwyer 3000MRS-0 Photohelic Switch/Gauge 0 to 0.5 inch Specification

Grade
Industrial Grade

Display
Analog (with pointer and scale)

Thread
1/8 female NPT high and low pressure connections

Outer Size
Approximately 4 (101.6 mm) diameter housing

Bourdon Tube
Not Applicable (Diaphragm based)

Sensor Type
Differential Pressure Sensor (Photohelic switch/gauge)

Seal Material
Silicone diaphragm, Buna-N (standard) seals

Material
Die-cast aluminum case, clear acrylic cover

Dial Material
White aluminum dial with black markings

Pointer Material
Aluminum pointer

Processing Type
Factory calibrated

Diameter
4 inches (101.6 mm)

Glass Size
Front lens approximately 4 inches

Mount Type
Flush or surface mount

Scale Range
0 to 0.5 inch of water column (in. w.c.)

Accuracy
2% of full scale

Finishing
Matte/satin finished case

Measure Pressure Of
Air and non-combustible compatible gases

Accessories
Mounting bracket, terminal screws, panel mounting hardware

Dwyer 3000MRS-0 Photohelic Switch/Gauge 0 to 0.5 inch Trade Information

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

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

Main Domestic Market
All India

About Dwyer 3000MRS-0 Photohelic Switch/Gauge 0 to 0.5 inch

Dwyer 3000MRS-0 Photohelic Switch/Gauge 0 to 0.5 inch

Series 3000MR/3000MRS Photohelic® Switch/Gage

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

Model	Description
3000MRS-0.5 inch	Pressure Switch/Gage,Range 0-0.5 inch, .01 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-Grade Differential Pressure Monitoring

Engineered for durability and precision, the 3000MRS-0 Photohelic switch/gauge meets rigorous requirements of industrial pressure monitoring. Its diaphragm-based sensor offers 2% accuracy across a 0 to 0.5 in. w.c. range, suitable for air and non-combustible gases. The IP54-rated front panel ensures protection in demanding environments.

Dual SPDT Snap Switches for Versatile Control

Equipped with two independent SPDT snap switches, the device supports a range of control applications. Each snap switch handles loads up to 10A at 120/240 VAC or 3A at 480 VAC, enabling integration with HVAC, fan, or filter systems. Switches respond instantaneously and require external power, but gauge readings are always available without power.

Flexible Installation and Hassle-Free Operation

The Dwyer Photohelic 3000MRS-0 features a 4-inch diameter for clear local display and is supplied with mounting bracket and panel hardware for easy flush or surface installation. Connections are made via 1/8" NPT female ports for high and low pressure. Its factory-calibrated construction ensures ready-to-use precision, while maintenance is simplified due to its robust design.

FAQs of Dwyer 3000MRS-0 Photohelic Switch/Gauge 0 to 0.5 inch:

Q: How does the Dwyer 3000MRS-0 Photohelic Switch/Gauge function without a power supply for gauge readings?

A: The gauge uses a mechanical differential pressure diaphragm to display pressure. This mechanical design does not require any external power to provide an accurate analog reading, ensuring reliable performance even during power loss.

Q: What types of applications benefit from using this Photohelic switch/gauge?

A: It is ideal for HVAC fan control, monitoring air filters, and controlling air flow in industrial systemsany application requiring both local pressure indication and electrical switching to automate equipment or alarms.

Q: When should I supply power to the 3000MRS-0?

A: External power is needed only for operating the SPDT snap switches, which provide electrical contacts for control circuits. The analog gauge will always display pressure readings mechanically regardless of power availability.

Q: Where are the pressure connections located and what type are they?

A: There are two 1/8" NPT female connections on the unitone for high and one for low pressure lines. These enable accurate differential pressure measurement across filters, fans, or ducts.

Q: What is the installation process for mounting the Photohelic 3000MRS-0?

A: The unit can be flush or surface mounted using the provided bracket, panel mounting hardware, and terminal screws. It has a 4-inch front face, designed for easy visibility and accessibility in control panels.

Q: How instantaneous is the devices mechanical switching response?

A: The mechanical snap switches respond instantly to pressure changes within the set range, allowing for immediate operation of external controls such as alarms, fans, or relays.

Q: What are the benefits of choosing this industrial-grade gauge over others?

A: Users gain reliable, accurate readings (2% of full scale), robust construction for harsh environments, IP54 panel protection, dual SPDT switching flexibility, and a low-maintenance, factory-calibrated deviceall contributing to reduced downtime and enhanced system control.

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