Photohelic Series 3000 MR

Dwyer Series 3000MR-3000MRS Photohelic Switch Gage

Photohelic Series 3000 MR
Photohelic Series 3000 MR

Combines Differential Pressure Gage with Low/High Set-points

Using solid state technology, the Photohelic Series 3000 MR 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 connections.

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).

Included Accessories: mounting ring, snap ring; 18″ (45 cm) 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); and (3) 6-32 x 5/16″ RH machine screws (surface mounting).

Service: Air and non-combustible, compatible gases.
Wetted Materials: Consult factory.
Accuracy: ±2% of full scale at 70°F (21.1°C). ±3% on -0 and ± on -00 models.
Pressure Limits: -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 120°F. (-6.67 to 48.9°C).
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 a 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″ (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.

Switch Type: Each setpoint has a solid state relay.
Switching Voltage: 20-280 VAC (47 – 63 Hz).
Switching Current: 1.0 amp (AC) max., 0.01 mA (AC) min., (2) SPST N.O.
Electrical Connections: 18″ (46 cm) cable assembly with 6 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.

Mounting ring, snap ring
18″ (45 cm) cable assembly
(2) 3/16″ tubing to 1/8″ NPT
(2) 1/8″ NPT pipe plugs
(4) 6-32 x 1 ¼” RH machine screws (panel mounting)
(3) 6-32 X 5/16″ RH machine screws (surface mounting)

-TAMP Tamper-Proof Knobs, require special spanner-type key (included) to adjust set points.
-LT Low Temperature Option for use under 20°F (-6.7°C).
-MP Medium Pressure increases maximum rated pressure to 35 psig (2.41 bar).
-HP High Pressure increases maximum rated pressure to 80 psig (5.5 bar).
A-298 Flat Aluminum Bracket
A-370 Mounting Bracket
A-600 R/C Snubber

Differential pressure switches shall incorporate gages and setpoint indicators for continuous indication of applied pressure and switch settings. Units shall be diaphragm operated with switching accomplished by phototransistor controlled (SPDT electro-mechanical relays)(solid state switches). Setpoint shall be controlled by knobs on front of unit. Switch/gages shall be Dwyer Instruments, Inc., Series 3000(MR)(MRS) Photohelic Catalog No. reading to ” w.c. in ” divisions. SERIES 3000MR(S)


3000MR-00-0.5" w.c..01 w.c.
3001MR0-1" w.c..02 w.c.
3002MR0-2" w.c..05 w.c.
3003MR0-3" w.c..10 w.c.
3005MR0-5" w.c..10 w.c.
3010MR0-10" w.c..20 w.c.
3015MR0-15" w.c..50 w.c.
3020MR0-20" w.c..50 w.c.
3030MR0-30" w.c.1.0 w.c.
3050MR0-50" w.c.1.0 w.c.
3100MR0-100" w.c.2.0 w.c.
3000MR-125PA0-125 Pa5.0 Pa
3000MR-250PA0-250 Pa5.0 Pa
3000MR-500PA0-500 Pa10.0 Pa
3000MR-60PA0-60 Pa2.0 Pa
3000MR-1KPA0-1 kPa.02 kPa
3000MR-3KPA0-3 kPa.10 kPa
3000MR-4KPA0-4 kPa.10 kPa
3000MR-100MM0-100 mm w.c.2.0mm w.c.
3000MR-10MM0-10 mm w.c..50mm w.c.
3000MR-25MM0-25 mm w.c..50mm w.c.
3000MR-50MM0-50 mm w.c.1.0 mm w.c.
3000MR-6MM0-6 mm w.c..20mm w.c.
3000MR-20CM0-20 cm w.c..50cm w.c.
3000MRS-00-0.5" w.c..01 w.c.
3001MRS0-1" w.c..02w.c.
3002MRS0-2" w.c..05w.c.
3003MRS0-3" w.c..10w.c.
3005MRS0-5" w.c..10w.c.
3010MRS0-10" w.c..20 w.c.
3015MRS0-15" w.c..50 w.c.
3020MRS0-20" w.c..50 w.c.
3030MRS0-30" w.c1.0 w.c.
3050MRS0-50" w.c.1.0 w.c.
3100MRS0-100" w.c.2.0 w.c.
3000MRS-125PA0-125 Pa5.0 Pa
3000MRS-250PA0-250 Pa5.0 Pa
3000MRS-500PA 0-500 Pa10.0 Pa
3000MRS-60PA0-60 Pa2.0 Pa
3000MRS-1KPA0-1 kPa.02 kPa
3000MRS-3KPA0-3 kPa.10 kPa
3000MRS-4KPA0-4 kPa.10 kPa
3000MRS-100MM0-100 mm w.c.2.0mm w.c.
3000MRS-10MM0-10 mm w.c..50mm w.c.
3000MRS-25MM0-25 mm w.c..50mm w.c.
3000MRS-50MM0-50 mm w.c.1.0 mm w.c.
3000MRS-6MM0-6 mm w.c.2.0 mm w.c.
3000MRS-20CM0-20 cm w.c..50cm w.c.