Photohelic® Switch/Gages Series 3000MR 3000MRS
Combines differential pressure gage with low/high set points.

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^® design. Switch setting is easy to adjust with large external knobs on 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 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).

PHYSICAL DATA
Maximum Pressure: 25 psig (1.72 bar)
Media Compatibility: air and non-combustible, non-corrosive gases
Accuracy: ±2% of full scale
Operating Temperature: 20-120°F (-6.7 to 48.9°C) (dry air)
Finish: Baked dark gray epoxy hammerloid
Weight: 1 lb., 10 oz. (.74 kg)
Pressure Connections: 1/8 - 27 NPT(F) (duplicated side and back)
Power Supply: 24 VDC, regulated
Electrical Connections: 18" (45 cm) cable assembly with 8 conductors, 3000MR; 6 conductors, 3000MRS

3000 MR Models
Relay Contacts: (resistive load) 2 SPDT rated 1.0 amp @ 30 VDC, 0.3 amp @ 110 VDC or 0.5 amp @ 125 VAC. Gold over silver - suitable for dry circuits.

3000MRS Models
Switching Voltage: 20-250 VAC (47-440 Hz)
Switching Current: 0.8 amp (AC) max. up to 40°C (104°F), 0.6 amp (AC) max. up to 48°C (120°F)(AC only), 0.5 mA (AC) min, (2) SPST N.O.

Accessories
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)

OPTIONS - ACCESSORIES
Tamper Proof Knobs, require spanner type key (supplied) to change setpoints. Add suffix -TAMP.
Low Temperature Option for operation under 20°F (-6.7°C). Add suffix -LT.
Medium Pressure increases maximum rated pressure to 35 psig (2.41 bar). Add suffix -MP.
High Pressure increase maximum rated pressure to 80 psig (6.89 bar). Add suffix -HP.
A371 Surface Mounting Bracket for use on vertical or horizontal surfaces. Heavy 16 ga. steel with dark grey epoxy hammertone finish.
A-600 R/C Snubber: Recommended for inductive (solenoid or contactor) loads. Specify part no. A-600.