MINI-PHOTOHELIC ® DIFFERENTIAL PRESSURE SWITCH/GAGE Compact, Low Cost Switch Gage DWYER INSTRUMENTS, INC. | dwyer-inst.com44 The Series MP Mini-Photohelic ® Differential Pressure Switch/Gage combines the time proven Minihelic ® II differential pressure gage with two SPDT switching set points. The Mini-Photohelic® switch/gage is designed to measure and control positive, negative, or differential pressures consisting of non-combustible and non-corrosive gases. Gage reading is independent of switch operation. Switching status is visible by LED indicators located on the front and rear of the gage. Set points are adjusted with push-buttons on the back of the unit. FEATURES/BENEFITS • Gage reading unaffected by switch operation and will continue to read pressure even during power loss • Visible switch status LED provides indication of set point switching state • Compact design but with the power of larger devices can meet the same application specifications APPLICATIONS • Fume hoods • Dust collection • Pneumatic conveying • Clean room LOW PRESSURE PORT HIGH PRESSURE PORT 3-1/32 [77.00] 1 [25.4] 3-1/16 [77.79] Ø2-19/32 [65.88] 3-13/16 [96.84] 3-1/32 [77.00] 9/32 [7.134] SPECIFICATIONS GAGE SPECIFICATIONS Service: Air and non-combustible, compatible gases. Wetted Materials: Consult factory. Accuracy: ±5% of FS @ 70ºF (21.1ºC). Gage face mounted in vertical position. Pressure Limits: 30 psig (2.067 bar). Temperature Limits: 20 to 120ºF (-6.7 to 49ºC). Process Connections: Barbed for 3/16˝ ID tubing (STD); 1/8˝ male NPT (optional). Size: 4-1/8˝ (104.78 mm) depth x 3-1/16˝ (77.79 mm) diameter. Weight: 23 oz (652 g). SWITCH SPECIFICATIONS Switch Type: (2) SPDT relays. Electrical Rating: 5 A @ 120/240 VAC resistive; 5 A @ 30 VDC. Electrical Connections: Screw type terminal block. Accepts 22-12 AWG wire. Power Requirements: 24 VDC / 24 VAC 50/60 Hz 4 watts. Mounting Orientation: Gage face in vertical position. Set Point Adjustment: Push-buttons. Standard Accessories: (2) mounting screws, (1) .050˝ hex allen wrench. Agency Approvals: CE, cULus. Differential Pressure Gages/Switches, Dial PRESSURE Process Tubing Options: See page 453 (Gage Tubing Accessories) SERIES MP MODEL CHART Model Range, Inches of WaterModel Range, Pa MP-000 MP-001 MP-002 MP-003 MP-005 MP-010 MP-020 0-0.5 0-1.0 0-2.0 0-3.0 0-5.0 0-10 0-20 MP-125PA MP-250PA MP-500PA 0-125 0-250 0-500 Model Range, kPa MP-1KPA MP-3KPA 0-1 0-3 ACCESSORIES ModelDescription A-301 A-302 A-302F-A A-489 Static pressure tip for 1/4˝ metal tubing connection Static pressure tip for 3/16˝ and 1/8˝ I.D. plastic or rubber tubing 303 SS static pressure tip with mounting flange; for 3/16˝ ID rubber or plastic tubing; 4˝ insertion depth; includes mounting screws 4˝ straight static pressure tip with flange OPTIONS To order add suffix:Description -NPT1/8˝ male NPT connections Example: MP-000-NPT; Note: Allow additional lead time. -NISTNIST traceable calibration certificate Example: MP-005-NIST Pressure_2021.indb 447/15/20 8:16 AMNext >