DWYER – Series A3000 Photohelic® Pressure Switch/Gage

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Description

Series A3000 Photohelic® Pressure Switch/Gage

 

3-in-1 Indicating Gage, Lo-limit and Hi-limit Control

The Series A3000 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. 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 in (0-6 mm) w.c. up to 30 psi (21 bar).

NIST CALIBRATION available in Product Configurator.

 

Product Applications

  • Air Conditioning Systems
  • Clean Rooms
  • Fume Exhaust Systems

 

Specifications

 

  • GAGE SPECIFICATIONS
  • Service: Air and non-combustible, compatible gases.
  • Wetted Materials: Consult Factory.
  • Accuracy: ±2% of FS 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).
  • Temperature Limits: 20 to 120°F. (-6.67 to 48.9°C). -20 to 120°F (-28 to 48.9°C) with low temperature option.
  • 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
  • Switch Type: Each setpoint has 2 Form C relays (DPDT).
  • Repeatability: ±1% of FS .
  • Electrical Rating: 10 A @ 28 VDC, 10 A @ 120, 240 VAC.
  • Electrical Connections: Screw terminals. Use 167°F (75°C) copper conductors only.
  • Power Requirements: 120 VAC, 50/60 Hz; 240 VAC & 24 VAC power optional.
  • Mounting Orientation: Diaphragm in vertical position. Consult factory for other position orientations.
  • Set Point Adjustment: Adjustable knobs on face.
  • Agency Approvals: CE, CSA, UL.

 

Features

  • Bezel and front cover (with set point knobs and zero adjustment screw) removed to expose Photohelic® switch/gage set point mechanism. Cover is clear polycarbonate plastic.
  • Gage pointer and light shutter are mounted on helix and balancing counterweight. Shutter passes through slot in optical limit switch to expose phototransistors to integral infrared light source or mask them depending on applied pressure.
  • Light shield effectively protects phototransistors from strong outside light sources yet allows free pointer movement. It also gives interior a clean “finished” look.
  • Optical limit switches are used for reliability and long service life. Attached directly to set pointers, they are individually aligned to assure precise switching accuracy.
  • Semi-Flexible drive shaft connects to set point knobs.
  • Zero adjustment screw connects to screw in cover to adjust zero pressure reading.
  • Plastic enclosure protects electronic components and electrical connections.
  • Polycarbonate connection or terminal board is self-extinguishing.
  • Glass epoxy printed circuit boards for durability and permanence.
  • Load relays are DPDT with latching feature for maximum application versatility.
  • Electronics are designed to operate on 50/60 Hz, 120 volt current with 10% over or under voltage. Special units for other voltages are available.
  • Switch set pointers show switch settings at all times.
  • Spring loaded friction clutch prevents operator damage of set point mechanism.
  • 3-in-1 instrument allows the reduction of several instruments with one product, saving inventory, installation time and money.
  • Patented design and 1% full scale dead band provides quick response to pressure changes means no delay in switching and chatter-free operation.
  • A wide range of models that can meet pressure measurement specifications from low to very high.

 

Models & Ordering

 

Inches of w.c.

Model Description
A3000-0 Pressure switch/gage, range 0-.50″ w.c.
A3000-00 Pressure switch/gage, range 0-.25″ w.c.
A3001 Pressure switch/gage, range 0-1.0″ w.c.
A3002 Pressure switch/gage, range 0-2.0″ w.c.
A3003 Pressure switch/gage, range 0-3.0″ w.c.
A3004 Pressure switch/gage, range 0-4.0″ w.c.
A3005 Pressure switch/gage, range 0-5.0″ w.c.
A3006 Pressure switch/gage, range 0-6.0″ w.c.
A3008 Pressure switch/gage, range 0-8.0″ w.c.
A3010 Pressure switch/gage, range 0-10″ w.c.
A3015 Pressure switch/gage, range 0-15″ w.c.
A3020 Pressure switch/gage, range 0-20″ w.c.
A3025 Pressure switch/gage, range 0-25″ w.c.
A3030 Pressure switch/gage, range 0-30″ w.c.
A3040 Pressure switch/gage, range 0-40″ w.c.
A3050 Pressure switch/gage, range 0-50″ w.c.
A3060 Pressure switch/gage, range 0-60″ w.c.
A3080 Pressure switch/gage, range 0-80″ w.c.
A3100 Pressure switch/gage, range 0-100″ w.c.
A3150 Pressure switch/gage, range 0-150″ w.c.

 

Inches of w.c. – Zero Center

Model Description
A3300-0 Pressure switch/gage, range .25-0-.25″ w.c.
A3301 Pressure switch/gage, range .5-0-.5″ w.c.
A3302 Pressure switch/gage, range 1-0-1″ w.c.
A3304 Pressure switch/gage, range 2-0-2″ w.c.
A3310 Pressure switch/gage, range 5-0-5″ w.c.
A3320 Pressure switch/gage, range 10-0-10″ w.c.
A3330 Pressure switch/gage, range 15-0-15″ w.c.

 

PSI

Model Description
A3201 Pressure switch/gage, range 0-1 psi.
A3202 Pressure switch/gage, range 0-2 psi.
A3203 Pressure switch/gage, range 0-3 psi.
A3204 Pressure switch/gage, range 0-4 psi.
A3205 Pressure switch/gage, range 0-5 psi.
A3210 Pressure switch/gage, range 0-10 psi, medium pressure option standard.
A3215 Pressure switch/gage, range 0-15 psi, medium pressure option standard.
A3220 Pressure switch/gage, range 0-20 psi, medium pressure option standard.
A3230 Pressure switch/gage, range 0-30 psi, high pressure option standard.

 

Inches of w.c./Air Velocity FPM

Model Description
A3000-00AV Pressure switch/gage, range 0-.25″ w.c./300-2000 FPM. Note: Pitot tube required.
A3000-0AV Pressure switch/gage, range 0-.50″ w.c./500-2800 FPM. Note: Pitot tube required.
A3001AV Pressure switch/gage, range 0-1.0″ w.c.500-4000 FPM. Note: Pitot tube required.
A3002AV Pressure switch/gage, range 0-2.0″ w.c./1000-5600 FPM. Note: Pitot tube required.
A3010AV Pressure switch/gage, range 0-10″ w.c./2000-12500 FPM. Note: Pitot tube required.

 

MM of w.c.

Model Description
A3000-100MM Pressure switch/gage, range 0-100 mm w.c.
A3000-10MM Pressure switch/gage, range 0-10 mm w.c.
A3000-25MM Pressure switch/gage, range 0-25 mm w.c.
A3000-50MM Pressure switch/gage, range 0-50 mm w.c.
A3000-6MM Pressure switch/gage, range 0-6 mm w.c.
A3000-80MM Pressure switch/gage, range 0-80 mm w.c.

 

MM of w.c. – Zero Center

Model Description
A3300-20MM Pressure switch/gage, range 10-0-10 mm w.c.
A3300-30MM Pressure switch/gage, range 15-0-15 mm w.c.

 

CM of w.c.

Model Description
A3000-100CM Pressure switch/gage, range 0-100 cm w.c.
A3000-150CM Pressure switch/gage, range 0-150 cm w.c.
A3000-15CM Pressure switch/gage, range 0-15 cm w.c.
A3000-200CM Pressure switch/gage, range 0-200 cm w.c.
A3000-20CM Pressure switch/gage, range 0-20 cm w.c.
A3000-250CM Pressure switch/gage, range 0-250 cm w.c.
A3000-25CM Pressure switch/gage, range 0-25 cm w.c.
A3000-300CM Pressure switch/gage, range 0-300 cm w.c.
A3000-50CM Pressure switch/gage, range 0-50 cm w.c.
A3000-80CM Pressure switch/gage, range 0-80 cm w.c.

 

Pascals

Model Description
A3000-125PA Pressure switch/gage, range 0-125 Pa.
A3000-250PA Pressure switch/gage, range 0-250 Pa.
A3000-500PA Pressure switch/gage, range 0-500 Pa.
A3000-60PA Pressure switch/gage, range 0-60 Pa.
A3000-750PA Pressure switch/gage, range 0-750 Pa.

 

Pascals – Zero Center

Model Description
A3300-250PA Pressure switch/gage, range 125-0-125 Pa.
A3300-500PA Pressure switch/gage, range 250-0-250 Pa.

 

Kilopascals

Model Description
A3000-1.5KPA Pressure switch/gage, range 0-1.5 kPa.
A3000-10KPA Pressure switch/gage, range 0-10 kPa.
A3000-15KPA Pressure switch/gage, range 0-15 kPa.
A3000-1KPA Pressure switch/gage, range 0-1 kPa.
A3000-20KPA Pressure switch/gage, range 0-20 kPa.
A3000-25KPA Pressure switch/gage, range 0-25 kPa.
A3000-30KPA Pressure switch/gage, range 0-30 kPa.
A3000-3KPA Pressure switch/gage, range 0-3 kPa.
A3000-4KPA Pressure switch/gage, range 0-4 kPa.
A3000-5KPA Pressure switch/gage, range 0-5 kPa.
A3000-8KPA Pressure switch/gage, range 0-8 kPa.

 

Kilopascals – Zero Center

Model Description
A3300-1KPA Pressure switch/gage, range .5-0-.5 kPa.
A3300-3KPA Pressure switch/gage, range 1.5-0-1.5 kPa.

 

Bi-Directional

Model Description
A3000-00N Pressure switch/gage, range .05 to .20″ w.c.

 

 

 

 

Additional information

Model

A3000-0, A3000-00, 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, A3201, A3202, A3203, A3204, A3205, A3210, A3215, A3220, A3230, A3000-00AV, A3000-0AV, A3001AV, A3002AV, A3010AV, A3000-100MM, A3000-10MM, A3000-25MM, A3000-50MM, A3000-6MM, A3000-80MM, A3300-20MM, A3300-30MM, A3000-100CM, A3000-150CM, A3000-15CM, A3000-200CM, A3000-20CM, A3000-250CM, A3000-25CM, A3000-300CM, A3000-50CM, A3000-80CM, A3000-125PA, A3000-250PA, A3000-500PA, A3000-60PA, A3000-750PA, A3300-250PA, A3300-500PA, A3000-1.5KPA, A3000-10KPA, A3000-15KPA, A3000-1KPA, A3000-20KPA, A3000-25KPA, A3000-30KPA, A3000-3KPA, A3000-4KPA, A3000-5KPA, A3000-8KPA, A3300-1KPA, A3300-3KPA, A3000-00N

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