Dwyer A3003 Photohelic® differential pressure switch qualitatively combines its functionality with that of digital pressure gauge. The instrument of high repeatability is used for procedures of measuring and controlling differential pressure of compatible gases and air. It is applicable for observing and detecting positive, negative and differential pressures.
Procedure of sensing
Typically, the given three-in-one indicator – the Photohelic® switch/gage – provides observance of pressure set points (high and low). The changes of pressure make the infrared light reach the set points and then is cut off by the light shutter. As a result, the signal of the phototransistor actuates the DPDT slave relay and, as a consequence, the switching process takes place. The deadband of 1% of full scale (or less) ensures chatter-free and reliable operation.
Having similar to the Magnehelic gage design, this model features:
- allows for easy adjustment of set point indicators that are controlled by gage-face knobs;
- continuous readings (is not affected by losses of power) for accurate output;
- high protection of electronics due to qualitative housing;
- convenient visual output on clear cover;
- reliable and accurate switching due to optical limit switches;
- helix-mounted pointer and light shutter;
- self-extinguishing connection of polycarbonate;
- spring-loaded friction clutch;
- latching of load relays provides versatility of applications.
The 3-in-1 function
This instrument can be wired to and holds in three positions:
- low-latching circuit;
- high-latching circuit;
- high and low-latching combination of circuits.
These modes of wiring can be manually reset by user – it appears to be of a big benefit for signal or alarm applications.
Applicability
- OEM, in-plant applications;
- systems of air conditioning;
- clean rooms;
- systems of fluidic or pneumatic control;
- materials handling equipment;
- alarm or control fume exhaust systems;
- air structures pressure control;
- respiratory or blood pressures monitoring.
The prominent representative of Dwyer A3000 series embodied in the A3003 model features superior functionality and durability for your profit and time-economy.
The build quality, functional characteristics and versatility of Dwyer A3003 make each user confident of the output and allow for profit increase.