Dwyer Photohelic® Pressure Switch/Gages A3000-20CM With Good Price In Stock

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® 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 setpoint indicators are controlled by knobs located on the gage face. Individual setpoint deadband is one pointer width — less than 1% of full scale. Setpoints 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 helixdriven 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.  

SPECIFICATIONS

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). A36003S – 36010S; 150 psig (10.34

bar). A36020S 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

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 op

tional.

Mounting Orientation: Diaphragm in vertical position. Consult factory for

other position orientations.

Set Point Adjustment: Adjustable knobs on face.

Agency Approvals: UL, CSA, CE. Optional-EXPL Explosion-proof

enclosure does not possess any agency approvals.

if you are intersted in more Allen-Bradley product, Please feel free to contct below contact me :windy@hkxytech.com 

Windy Wang 
HONGKONG XIEYUAN TECH CO., LIMITED  
Add: 7-A16,Caishen Commercial Plaza,Hankou Railway Station,Wuhan,China
Tel: +86-27-8588 3233 | Fax:+86-27-8530 9780 | Mobile/Whatsapp :+86 15972199006 | Skype: windy@hkxytech.com
Mail: windy@hkxytech.com 
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