Description: Photohelic Differential Pressure Switch Gauge Series A3000
Condition: New
Brand: Dwyer®
Part Number: A3000 

Specifications:

Accuracy Detail
± 2% of FS at 70°F (21.1°C). ± 3% on -0 and ± 4% on -00 models
Compliance
CE, CSA, UL
Dial Depth
8.25 in
Dial Dia
4 in
Dial Outer Diameter
5 in
Division
0
Electrical Connection
Screw Terminal
Materials, Wetted
Consult Factory
Media Compatibility
Air, Argon, Carbon dioxide, Helium, Nitrogen, Non-Corrosive Dry Gases
Mounting Orientation
Vertical Diaphragm
Operating Temperature, Max
120 °F
Operating Temperature, Min
20 °F
Pressure Type
Differential
Process Connection Size
1/8 in
Process Connection Type
NPT Female
Proof Pressure
-20 inHg to 25 psi
Repeatability
± 1%
Set Point Adjustment
Adjustable Knobs
Supply Power Note
120 VAC, 50/60 Hz; 240 VAC and 24 VAC power optional
Supply Power Type
AC
Supply Voltage
120 Vac
Switch Note
Each set point has 2 form C relays (DPDT). 10 A @ 28 VDC, 10 A @ 120, 240 VAC
Switch Rating
10 A @ 28 Vdc, 10 A @ 120, 240 Vac
Switch Type
(2) DPDT

Manufacturer information

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.

Warranty
First Truck Parts offers a 365-days warranty for all types of parts and in any condition. The warranty applies only to buyers who have placed an order on our website.