Dwyer A3015 Photohelic® switch/gage represents a versatile multi-functional tool. Being a combination of a pressure switch and a pressure gage, this instrument provides users with precise output concerning air and compatible gases pressure readings. It is capable of controlling and measuring positive, negative and differential pressure and is rated to 25 psig.
Beneficial qualities
- set point is easily adjusted by special knobs on the front panel;
- variable deadband can be provided by set points interlocking;
- provides continuous readings even during loss of power;
- ensures chatter-free operation.
Construction characteristics
The device possesses a plastic enclosure which acts as a protective shield for all the components and connections inside; along with it the case prevents damages of the electronics which operates on 50/60 Hz (120 V current) with 10% over/under voltage. Each user can easily observe the pointer readings on the gage face and still be sure of its proper protection from strong light sources provided by a light shield. In addition, the possible damages of set point mechanism are eliminated due to a spring loaded friction clutch.
Performance
Providing control operation between two set points – low and high pressure – the infrared light is cut off by the light shutter. It results in signals of phototransistor that are then amplified for actuation of DPDT relay. Due to this the switching then occurs.
Applicability
The A3015 model is typically applied for precise readings and control of pressure in:
- clean rooms;
- air conditioning systems;
- fume exhaust systems;
- pneumatic and fluid control systems;
- other equipment.
This Photohelic® switch/gage is singled out by top-rank professionals in industrial field for being durable, functional and easy-to-operate.