Dwyer 3000MRS Photohelic Switch/Gauge 0 to 250 Pa

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Dwyer 3000MRS Photohelic Switch/Gauge 0 to 250 Pa

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Dwyer 3000MRS Photohelic Switch/Gauge 0 to 250 Pa Specification

Thread
1/8 female NPT high and low pressure connections

Grade
Industrial

Display
Analog with Setpoint Windows

Seal Material
Silicone O-ring

Sensor Type
Photohelic Differential Pressure Sensor

Outer Size
Approx. 116 mm diameter (including flange)

Material
Die-cast aluminum case, polycarbonate cover, brass fittings

Dial Material
White aluminum with black markings

Pointer Material
Black anodized aluminum

Processing Type
Electrical relay integrated

Diameter
Approx. 101 mm housing

Glass Size
Clear polycarbonate window, 4 inches

Mount Type
Flush panel or surface mount

Scale Range
0 to 250 Pa

Accuracy
2% of full scale

Accessories
Standard mounting bracket, hardware, and instructions

Panel Cutout Size
114 mm diameter

Switch Type
SPDT snap switches, 2 integral setpoints

Operating Temperature Range
-18C to 60C

Power Requirements
No external power needed for gauge; switching 120/240 VAC required for relays

Repeatability
1% of full scale

Relay Response Time
Within milliseconds (fast acting relays)

Pressure Limits
-68 to 103 kPa (overpressure/safe limits)

Weight
Approx. 700 g

Protection Degree
IP65 (front), dust-tight, splash resistant

Electrical Rating
10 A @ 120/240 VAC

Dwyer 3000MRS Photohelic Switch/Gauge 0 to 250 Pa 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

Dwyer 3000MRS Photohelic Switch/Gauge 0 to 250 Pa About

Dwyer 3000MRS Photohelic Switch/Gauge 0 to 250 Pa

Series 3000MR/3000MRS Photohelic Switch/Gage

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

Model	Description
3000MRS-250 Pa	Pressure Switch/Gage,Range 0-250 Pa, 5.0 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 70F
Pressure Limits	-20" Hg to 25 psig
Temperature Limits	20 to 120F
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

Durable and Reliable Industrial Design

Enclosed within a die-cast aluminum case with a molded polycarbonate front, the Dwyer 3000MRS ensures long-lasting performance in tough environments. Its protection degree of IP65 makes it dust-tight and resistant to splashes, suitable for various industrial applications such as steam, oil, and gas measurement.

Precise Control and Monitoring

Equipped with highly responsive SPDT snap switches and a repeatability of 1% of full scale, this gauge allows accurate pressure setpoints and control. The clear analog display with setpoint windows provides easy pressure reading and facilitates process automation.

Versatile Mounting and Easy Installation

The 3000MRS features both flush panel and surface mounting options, complete with a standard mounting bracket and hardware. Its compact, lightweight design and 114 mm panel cutout requirement ensure straightforward integration into control panels or machinery.

FAQ's of Dwyer 3000MRS Photohelic Switch/Gauge 0 to 250 Pa:

Q: How does the Dwyer 3000MRS Photohelic Switch/Gauge operate without external power?

A: The gauge function of the Dwyer 3000MRS relies on an analog mechanism and does not require external power; only the switching relays need 120/240 VAC supplied for their operation. This ensures continuous pressure monitoring, even if external power is lost.

Q: What types of media can the 3000MRS measure pressure for?

A: This instrument is designed to measure the differential pressure in steam, oil, and gas systems, making it suitable for a wide variety of industrial applications.

Q: When should the setpoints for the SPDT snap switches be adjusted?

A: Setpoints should be configured during installation or whenever process requirements change. These setpoints determine the pressure thresholds at which each relay will activate or deactivate.

Q: Where can the 3000MRS be installed in an industrial setup?

A: It can be surface mounted or installed flush into a control panel using its standard mounting bracket. The required panel cutout is 114 mm in diameter, supporting versatile placement options.

Q: What protective features does the 3000MRS offer for demanding environments?

A: It features an IP65-rated front, ensuring dust-tight and splash-resistant operation. The molded clear polycarbonate cover and silicone O-ring seal further protect the internal components from harsh surroundings.

Q: How fast does the relay respond to pressure changes?

A: The integrated SPDT relays respond within milliseconds, enabling immediate switching to safeguard processes and equipment.

Q: What are the benefits of using a Photohelic Differential Pressure Sensor in this gauge?

A: The Photohelic sensor combines precise pressure sensing with the convenience of integrated electrical switching, delivering reliable control and monitoring in one compact device.

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