Dwyer Instruments SERIES 3000MR, SERIES 3000MRS Data Sheet

SERIES 3000MR/3000MRS | PHOTOHELIC® SWITCH/GAGE

FEATURES/BENEFITS

•  Gage reading unaffected by switch operation and will continue to read pressure

even during power loss

•  Zero and range adjustments outside of gage means no disassembly in normal

service

•  Solid state design allows for switching in high cycle rate applications without

degradation

•  Optional stainless steel bezel is the same installation diameter as Magnehelic

gage and simplifies field upgrade to Photohelic® switch/gage

APPLICATIONS

•  Pneumatic conveying

•  Air conditioning systems

•  Clean rooms

®

DESCRIPTION

Using solid state technology, the SERIES 3000MR & 3000 MRS Photohelic® Switches/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
design. Switch setting is easy to adjust with large external knobs on the gage face. Gage reading

is unaffected by the 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 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 connections.

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).

®

gage

Note: Shown with optional -SS bezel.

Backward compatible with Magnehelic® gage.

DWYER INSTRUMENTS, INC.

GAGE SPECIFICATIONS

Wetted Materials

Accuracy

Pressure Limit

Temperature Limits

Process Connections

Weight

Relay Contacts

Electrical Connections

Power Requirements

Set Point Adjustment

Agency Approvals

Switching Current

Electrical Connections

Power Requirements

Set Point Adjustment

Agency Approvals

Service Air and non-combustible, compatible gases.

Consult factory.
±2% of FS (3000-0 ±3% of FS). (3000-00 ±4% of FS).

-20" Hg to 35 psig (-0.677 bar to 1.72 bar). MP option: 35 psig (2.41 bar), HP option: 80 psig (5.52 bar).
20 to 120°F (-6.67 to 48.9°C).
1/8" female NPT (duplicated side and back).

Size 4" (101.6 mm) dial face, 5" (127 mm) OD x 3-1/8" (79.38 mm); -SS Bezel: 4-3/4" (120.7 mm) OD x 2-21/32" (67.5 mm).

1.8 lb (816 g).

3000 MR SWITCH SPECIFICATIONS

Switch Type Each set point has 1 form C relays (SPDT)

(Resistive load) 1 form C rated 1.0 A @ 30 VDC, 0.3 A @ 110 VDC or 0.5 A @ 125 VAC. Gold over clad silver – suitable for
dry circuits.

18" (46 cm) cable assembly with 8 conductors. Optional lengths to 100' (30.5 m).
24 VDC, regulated 10%.

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

Adjustable knobs on face.
CE.

3000MRS SPECIFICATIONS

Switch Type Each set point has a solid state relay.

Switching Voltage 20 to 280 VAC (47 to 63 Hz).

1.0 A (AC) max., 0.01 mA (AC) min., (2) SPST NO.
18" (46 cm) cable assembly with 6 conductors, optional lengths to 100' (30.5 m).
24 VDC, regulated ±10%.

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

Adjustable knobs on face.
CE.

DWYER INSTRUMENTS, INC.