IS220PAICH1A The working principle and application field of mechanical pressure switch
Mechanical pressure switch is one of the most simple equipment in the field of pressure switch, because of its mature technology, cost-effective because it is widely used in automotive refrigeration system of high and low pressure protection control, steam conditions and power stations; Accumulator, receiver, flash tank, separator, scrubber, oil refining unit. It can also be used for high and low pressure protection control of various equipment tools.
General working principle of mechanical pressure switch: When the pressure in the system is higher than or lower than the rated safety pressure, the sensor inner piece moves instantaneously, and the switch joint is switched on or off through the connecting guide rod. When the pressure drops to or rises the rated recovery value, the diaphragm will reset and the switch will reset automatically, or simply when the measured pressure exceeds the rated value, the free end of the elastic element will shift. Push the switch element directly or after comparison to change the on-off state of the switch element to achieve the purpose of controlling the measured pressure. The elastic elements used in the mechanical pressure switch include a single coil spring tube, diaphragm, diaphragm box and bellows. IS220PAICH1A The switching elements are magnetic switch, mercury switch, micro switch and so on.
The main categories of mechanical pressure switches include normally open and normally closed. The main features are:
1, the use of British pipe thread quick joint or copper pipe welding installation structure, flexible installation, easy to use, no special installation fixed.
2, the chip wire connection can be selected by the user.
4. Sealed stainless steel sensor is safe and reliable.
5, the pressure range can be manufactured according to the pressure value selected by the user.
I S220PAICH1AElectromechanical pressure switches instead of various mechanical mechanical pressure switches have gradually become the mainstream of applications. Usually there are mechanical pressure switch pumps, are some high pressure pumps, such as the pump to send water to the tall building, in order to reach a certain pressure, the pump shut down, to avoid no load but the pump has been turning, waste of electricity, while the role of the storage tank will not let the pressure immediately lost, so not a lot of water pump will not start. When the pressure of the tap water pipeline or air pump is less than the lower limit of the switching pressure adjustment point, the switch is automatically switched on and the pump starts to operate. When the pressure of the tap water pipeline or air pump is greater than the upper limit of the switching pressure adjustment point, the switch is automatically disconnected and the pump stops running. The upper and lower limits of the switching pressure can be adjusted within the adjustment range with the difference of the water height and the pressure required by the air pump. Most acceleration sensors work according to the principle of piezoelectric effect.
IS220PAICH1A The so-called piezoelectric effect is “for a heteropolar crystal without a center of symmetry, the external force added to the crystal in addition to the deformation of the crystal, will also change the polarization of the crystal, the electric field is established inside the crystal, this phenomenon of polarization of the medium due to mechanical force is called the positive piezoelectric effect.”
The general acceleration sensor is the use of its internal crystal deformation due to acceleration caused by this characteristic. Since this deformation generates a voltage, the acceleration can be converted into a voltage output as long as the relationship between the generated voltage and the applied acceleration is calculated. Of course, there are many other ways to make acceleration sensors, such as capacitance effect, hot gas bubble effect, light effect, but the most basic principle is that a medium is deformed due to acceleration, and its deformation is measured and converted into a voltage output by the relevant circuit.
What do you need to consider when choosing an acceleration sensor?
IS220PAICH1A Analog output vs Digital output:
This is the first thing to consider. It depends on the interface between your system and the acceleration sensors. Generally, the analog output voltage and acceleration are proportional, such as 2.5V corresponding to 0g acceleration, 2.6V corresponding to 0.5g acceleration. Digital outputs generally use pulse width modulation (PWM) signals.
If you are using a microcontroller with only digital inputs, such as BASICStamp, then you can only choose a digital output acceleration sensor, but the problem is that you have to take up an extra clock unit to process PWM signals, and it is not a small burden on the processor.