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Differential Pressure Gauge with low/high switch “Dwyer” M. 3000




Series 3000MR

Photohelic® Switch/Gages


Combines Differential Pressure Gage with Low/High Set-points


Using solid state technology, the Series 3000MR and 3000MRS Photohelic® switch/gages

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” (122 mm) hole or surface mounted with hardware supplied.

3000MR models employ versatile electromechanical relays with gold over silver contacts – ideal for dry circuits.

For applications requiring high cycle rates, choose 3000MRS models with SPST (N.O.) solid state relays. All

models provide both low and high limit control and include 18-inch (45 cm) cable assemblies for electrical



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 (1.725 bar). Optional construction is available for use to either

35 psig (2.42 bar) or 80 psig (5.51 bar).




Service: Air and non-combustible, compatible gases.


Wetted Materials: Consult factory.


Accuracy: +/-2% of full scale (3000-0 +/-3% of full scale). (3000-00 +/-4% of full scale).


Pressure Limit: -20” Hg. To 25 psig (-0.677 bar to 1.72 bar). MP option; 35 psig (2.41 bar),

HP option; 80 psig (5.52 bar).


Temperature Limits: 20 to 120F (-6.67 to 48.9C).


Process Connections: 1/8” female NPT (duplicated side and back).


Size: 4” (101.6 mm) dial face, 5” (127 mm) O.D. x 3-1/8” (79.38 mm).


Weight: 1.8 lb (816 g).



Switch Type: Each setpoint has 1 form C relays (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” (46 cm) cable assembly with 8 conductors. Optional lengths to 100´ (30.5 m).


Power Requirements: 24 VDC, regulated +/-10%.


Mounting Orientation: Diaphragm in vertical position. Consult factory for other position orientations.


Set Point Adjustment: Adjustable knobs on face.


Agency Approvals: CE.


Series 3000MR, 3000MRS Photohelic®


Range, MM W.C.

Minor Divs.

















* +/-3% of full scale.


This product was added to our catalog on Sunday 29 May, 2011.
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Nanomachinery Co., Ltd.
4, Soi Petchkasem 100 ,Phetchkasem Rd. ,Bangkaenue ,Bangkae ,Bangkok, 10160, THAILAND.
Tel : 086-322-6876 ,02-421-9927 ,Fax : 02-809-2591 E-mail : pongthorn@nano-machinery.com
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