Dwyer A3000-00 PRESSURE SWITCH,PHOTOHEL GAUGE, 0-.25in WC, CSA

• 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
• Gauge 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

Specifications:

Gauge 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 Type: Each setpoint has 2 Form C relays (DPDT)
Repeatability: ±1% of full scale
Electrical Rating: 10A @ 28 VDC, 10A @ 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: UL,CSA, CE
NOTE: Optional (-EXPL) Explosion-proof Enclosure does not possess any agency approvals