Pneumatic valve position detection in the modern process of installation

parse the modern process of pneumatic valve installation position detection
in the process industry, pneumatic valves and consistently used for liquid flow control and transfer of the driver. Hope more and more factory engineer in control system of pneumatic valve, bibcock and current position feedback signal of the driver. Usually this signal by built into the proximity sensor switch box, or directly installed on the drives or manual pneumatic valve of double sensors to obtain. This paper discussed the application in the field and new market trend of sensor types.
standardization status quo
the industry standard for the development of the technology advantages and disadvantages coexist. On the one hand, it limits the creativity, but on the other hand, ensure the equipment of different manufacturers have compatibility. VDE/VDI standard requires a lot of things, rules on the pneumatic drive machines and important mechanical connection between the connected devices. This standard includes the definition of mounting holes: x and x mm mm. Install the rod, and mm in height. To install the rod diameter, then there is no fixed standard, so in the application of double sensors, the user must pay special attention to.
the terms 'switch' is usually described in a closed box sensor, the integration of CAM and connector. Through its sensors and actuators to achieve mechanical connection. The solution to avoid sensors or affected exposed to the surrounding environment, to be able to use standard sensors at the same time. In these standard switch box, a typical built-in sensors:
cylindrical transducer, typical length is mm;
low trough sensor;
low rectangular V style sensor ( Similar to the micro switch) ；
double sensors, compact structure in a box.
switch box is used as a terminal device to connect to the pneumatic valve position sensor and electromagnetic pneumatic valve. Encoding the connectors and the necessary LED lamp has been placed in the circuit board. The size of the circuit board is suitable for most standard box.
'open solution' provisions of the pneumatic valve automatically or manually double sensor installed on the pneumatic valve. Superposition of two inductive sensors installed in a shell, shows the pneumatic valve switch position accurately.
the design of the system considering the VDE/VDI standard. These sensors are made up of two degrees vertically installed on the 'disc' stainless steel target trigger. The disc itself through a screw installed on the actuator.
in addition to small size, simple assembly, can also find the following advantages:
low sensor installed circular hole on the shell ( The slotted) Can be avoided due to wrong installation distance or movement of collision or vibrations caused by maintenance. Two switching element (
' The disc) Can adapt to a variety of pneumatic actuators. The only need to make a choice is to install mode, such as: * or *
low stainless steel target has been designed on the disk.
low a LED indicates that the sensor output, such as power and electromagnetic pneumatic valve output state.
low double sensor detection area narrow enough, so that it can't be produced extrusion point lead to operating personnel were injured, and the plugging of ice, dust formation.
low electromagnetic pneumatic valve connection, can undertake wiring through the sensor, the scene without the need for a separate cable.
inductive sensors and mechanical switch
in all areas of industrial, mechanical switch once, various control problems is the preferred scheme and methods have changed today, however, sensors, no doubt is first selection. Because the working speed and reliability of the sensor's advantage is very obvious