Specifications (PDF)
Photohelic® Switch/Gages function as versatile, highly repeatable pressure switches combined with a precise pressure gage employing the time-proven Magnehelic® gage design. The Photohelic® switch/gage measures and controls positive, negative or differential pressures of air and compatible gases. Standard models are rated to 25 psig (1.7 bar) with options to 35 (2.4) or 80 (5.5 bar) psig. Single pressure 36000S models measure to 6000 psig (413 bar) with a 9000 psig (620 bar) rating. Two phototransistor actuated, DPDT relays are included for low/high limit control. Easy to adjust set point indicators are controlled by knobs located on the gage face. Individual set point deadband is one pointer width – less than 1% of full scale. Set points can be interlocked to provide variable deadband – ideal for control of fans, dampers, etc. Gage reading is continuous and unaffected by switch operation, even during loss of electrical power. Choose from full scale pressure ranges from a low 0-.25″ (0-6 mm) w.c. up to 30 psi (21 bar); single positive pressure to 6000 psig (413 bar).
Photohelic Sensing – How It Works
In typical applications, these Dwyer switch/gages control between high and low pressure set points. When pressure changes, reaching either set point pressure, the infrared light to the limiting phototransistor is cut off by the helix-driven light shutter. The resulting phototransistor signal is electronically amplified to actuate its DPDT slave relay and switching occurs. Dead band between make and break is 1% of full scale or less – just enough to assure positive, chatter-free operation.
Relay-Transformer Features
A plastic housing protects all electronic components. Solid-state and integrated circuit electronics are on glass-epoxy printed circuit boards and self-extinguishing terminal boards.
| GAGE SPECIFICATIONS 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 ±4% on -00 models. Pressure Limits: -20″ Hg. to 25 psig (-0.677 to 1.72 bar). MP option; 35 psig (2.41 bar), HP option; 80 psig (5.52 bar). 36003S 36010S; 150 psig (10.34 bar). 36020S and higher; 1.2 x full scale pressure. Temperature Limits: 20 to 120°F. (-6.67 to 48.9°C) Low temperature option available. Process Connections: 1/8″ female NPT. Size: 4″ (101.6 mm) dial face, 5″ (127 mm) O.D. x 8-1/4″ (209.55 mm). Weight: 4 lb (1.81 kg). SWITCH SPECIFICATIONS
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| EXAMPLE | A3000-00N | 24VAC | Series A3000-00N-24VAC Photohelic® Pressure switch/Gage, range .05-0-0.2″ w.c., with 24VAC relay pack. |
| RANGE | A3000-00N A3000-00 A3000-0 A3001 A3002 A3003 A3004 A3005 A3006 A3008 A3010 A3015 A3020 A3025 A3030 A3040 A3050 A3060 A3080 A3100 A3150 A3300-0 A3301 A3302 A3304 A3310 A3320 A3330 A3340 A3360 A3380 A3000-00AV A3000-0AV A3001AV A3002AV A3010AV A3000-50FTWC A3201 A3202 A3203 A3204 A3205 A3210 A3215 A3220 A3230 A36003S A36006S A36010S A36020S A36030S A36060S A36100S A36300S A36500S A3000-5HG A3000-8HG A3000-10HG A3000-15HG A3000-20HG A3000-25HG A3000-30HG A3000-40HG A3000-50HG A3000-60HG A3000-400MMHG A3000-6MM A3000-10MM A3000-20MM A3000-25MM A3000-50MM A3000-80MM A3000-100MM A3000-150MM A3000-200MM A3000-250MM A3000-300MM A3000-500MM A3000-600MM A3000-2500MM A3300-10MM A3300-20MM A3300-30MM A3300-200 MM A3000-1CM A3000-2CM A3000-5CM A3000-8CM A3000-10CM A3000-15CM A3000-20CM A3000-25CM A3000-30CM A3000-40CM A3000-50CM A3000-80CM A3000-100CM A3000-150CM A3000-200CM A3000-250CM A3000-300CM A3300-4CM A3300-10CM A3300-20CM A3300-30CM A3000-60PA A3000-100PA A3000-125PA A3000-250PA A3000-300PA A3000-500PA A3000-750PA A3300-120PA A3300-250PA A3300-500PA A3000-.5KPA A3000-1KPA A3000-1.5KPA A3000-2KPA A3000-3KPA A3000-4KPA A3000-5KPA A3000-8KPA A3000-10KPA A3000-15KPA A3000-20KPA A3000-25KPA A3000-30KPA A3000-40KPA A3000-100KPA A3300-1KPA A3300-3KPA A3300-10KPA A3000-1MBAR A3000-5MBAR A3000-8MBAR A3000-20MBAR A3000-25MBAR A3000-50MBAR A3000-100MBAR A3000-500MBAR A3000-20ZPSI A3000-40ZPSI A3000-50ZPSI |
.05-0-.2″ w.c. 0-0.25″ w.c. 0-0.5″ w.c. 0-1″ w.c. 0-2″ w.c. 0-3″ w.c. 0-4″ w.c. 0-5″ w.c. 0-6″ w.c. 0-8″ w.c. 0-10″ w.c. 0-15″ w.c. 0-20″ w.c. 0-25″ w.c. 0-30″ w.c. 0-40″ w.c. 0-50″ w.c. 0-60″ w.c. 0-80″ w.c. 0-100″ w.c. 0-150″ w.c. .25-0.25″ w.c. .5-0-.5″ w.c. 1-0-1″ w.c. 2-0-2″ w.c. 5-0-5″ w.c. 10-0-10″ w.c. 15-0-15″ w.c. 20-0-20″ w.c. 30-0-30″ w.c. 40-0-40″ w.c. 0-.25″ w.c. & 300-2000 FPM AV 0-.5″ w.c. & 500-2800 FPM AV 0-1″ w.c. & 500-4000 FPM AV 0-2″ w.c. & 1000-5600 FPM AV 0-10″ w.c. & 2000-12500 FPM AV 0 – 50 ft w.c. 0-1 psid 0-2 psid 0-3 psid 0-4 psid 0-5 psid 0-10 psid 0-15 psid 0-20 psid 0-30 psid 0-30 psid (single pressure) 0-60 psid (single pressure) 0-100 psid (single pressure) 0-200 psid (single pressure) 0-300 psid (single pressure) 0-600 psid (single pressure) 0-1000 psid (single pressure) 0-3000 psid (single pressure) 0-5000 psid (single pressure) 0-5″ Hg 0-8″ Hg 0-10″ Hg 0-15″ Hg 0-20″ Hg 0-25″ Hg 0-30″ Hg 0-40″ Hg 0-50″ Hg 0-60″ Hg 0-400 mm Hg 0-6 mm w.c. 0-10 mm w.c. 0-20 mm w.c. 0-25 mm w.c. 0-50 mm w.c. 0-80 mm w.c. 0-100 mm w.c. 0-150 mm w.c. 0-200 mm w.c. 0-250 mm w.c. 0-300 mm w.c. 0-500 mm w.c. 0-600 mm w.c. 0-2500 mm w.c. 5-0-5 mm w.c. 10-0-10 mm w.c. 15-0-15 mm w.c. 100-0-100 mm w.c. 0-1 cm w.c. 0-2 cm w.c. 0-5 cm w.c. 0-8 cm w.c. 0-10 cm w.c. 0-15 cm w.c. 0-20 cm w.c. 0-25 cm w.c. 0-30 cm w.c. 0-40 cm w.c. 0-50 cm w.c. 0-80 cm w.c. 0-100 cm w.c. 0-150 cm w.c. 0-200 cm w.c. 0-250 cm w.c. 0-300 cm w.c. 2-0-2″ cm w.c. 5-0-5 cm w.c. 10-0-10 cm w.c. 15-0-15 cm w.c. 0-60 Pa 0-100 Pa 0-125 Pa 0-250 Pa 0-300 Pa 0-500 Pa 0-750 Pa 60-0-60 Pa 125-0-125 Pa 250-0-250 Pa 0-0.5 kPa 0-1 kPa 0-1.5 kPa 0-2 kPa 0-3 kPa 0-4 kPa 0-5 kPa 0-8 kPa 0-10 kPa 0-15 kPa 0-20 kPa 0-25 kPa 0-30 kPa 0-40 kPa 0-100 kPa 0.5-0-0.5 kPa 1.5-0-1.5 kPa 5-0-5 kPa 0-1 mbar 0-5 mbar 0-8 mbar 0-20 mbar 0-25 mbar 0-50 mbar 0-100 mbar 0-500 mbar 0-20 ounce per square inch 0-40 ounce per square inch 0-50 ounce per square inch |
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| OPTIONS | 24VAC 240VAC AT BUNA COO DEED EDED EDDE ED EXPL G HC HL LH LL OLS LT M MP NIST R RMR RMR1 RMR2 RMR10 RMR15 RMR20 RMR25 RMR30 RMR40 RMR50 RMR60 RMR70 RMR80 RMR90 RMR100 SF SRH SRL ST TA TAMP VIT WP Y |
24 VAC Relay Pack 220/240 VAC Relay Pack Aluminum Tag Buna-N Diaphragm Certificate of Origin Energizing (set point low: de-energizing/energizing; set point high: energizing/de-energizing) Energizing (set point low: energizing/de-energizing; set point high: energizing/de-energizing) Energizing (set point low: energizing/de-energizing; set point high: de-energizing/energizing) Energizing (set point: energizing/de-energizing) Explosion-proof Housing with Breather & Drain Green Scale Overlay Horizontal Calibration (90° face up) Latching Option (high/low) Latching Option (low/high) Latching Option (low/low) Less Relay Low Temperature Mirror Scale Overlay Medium Pressure NIST Certificate of Calibration Red Scale Overlay Remote Mounted Relay Std. 5 Ft. Remote Mounted Relay 1 Ft. Remote Mounted Relay 2 Ft. Remote Mounted Relay 10 Ft. Remote Mounted Relay 15 Ft. Remote Mounted Relay 20 Ft. Remote Mounted Relay 25 Ft. Remote Mounted Relay 30 Ft. Remote Mounted Relay 40 Ft. Remote Mounted Relay 50 Ft. Remote Mounted Relay 60 Ft. Remote Mounted Relay 70 Ft. Remote Mounted Relay 80 Ft. Remote Mounted Relay 90 Ft. Remote Mounted Relay 100 Ft. Silicone Free Single Right Hi Latching Single Right Lo Latching Stainless Steel Tag Tilt Angle from Vertical in Degrees (-90 to 90) Tamperproof Knobs Fluoroelastomer Diaphragm Weatherproof Housing Yellow Scale Overlay |
