Dwyer Omega – Series A3000 Photohelic® Switch/Gages for Pressure Measurement up to 25 psig
Product Code: Series A3000
Manufacturer: Dwyer Omega
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).
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
Measurement 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
Weight
4 lb
- 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
