In industrial measurement, there are always many special measurement media. For example, strong acids, strong bases, or more complex measurement media, such as asphalt, mud, etc. In practical production needs, there are many places where mud pressure is needed. So put forward high requirements on how to choose the pressure transmitter. We all know that the pressure sensors used in ordinary pressure transmitters are ceramic, diffused silicon, and so on. When they are in contact with the medium, their requirements for the medium are also more demanding. Ceramics are relatively brittle, and diffused silicon diaphragms are relatively thin and are afraid of hard objects. Once the hard particles hit the diaphragm, the pressure sensor is broken. What should we do? We used a type of load cell in a simulated coal seam pressure. Yes, it is a load cell. When there is pressure to squeeze the pressure fulcrum of the load cell, there will be a change in weight. Then can we use this method to measure the mud? The pressure point is made into a plane, and the size of the plane is fixed. The pressure is the pressure on the unit area, the area is known, and the pressure can be calculated. When you do the calibration, you can calibrate it according to a certain proportion. In actual use, this method is still more feasible. Only when the pressure is small, this method is not sensitive enough and the accuracy is not guaranteed.
According to the temperature change of the
working environment, the thermostat will have some physical deformations within
the switch, resulting in some special effect. The thermostat will cause a
series of automatic control element of turning off and turning on, which is
also called temperature control switch, temperature controller, temperature protector,
referred to the thermostat. Through thermal protector, the temperature
protector will send the temperature to the thermostat and the thermostat will
send the commands to control the operation of the device in order to achieve
the desired temperature and the energy saving effect. Now the thermostat are
widely used in thermostat application appliances, motors, cooling, heating and
many other products.
The working principle of the thermostat is
automatically sampling, real-time monitoring through the temperature sensor.
The control circuit starts when the ambient temperature is higher than the
control set point. If the temperature still rise, when the temperature rose to
over-limit alarm set point, the thermostat start limit alarm function. When
temperature control can not be effectively controlled in order to prevent
destruction of the device also can be stopped by the trip device features
continue to run.
According to the function of the working,the thermostat have different types:Intelligent Thermostat,Remote Controlled Thermostat,Programmable Thermostat,Wireless Room Thermostat.
Room Thermostat Room Thermostat,Auto Thermostat,Intelligent Thermostat,Remote Controlled Thermostat,Programmable Thermostat,Wireless Room Thermostat Berggruen Technology Co.,Ltd , http://www.meter-technology.com