1. Measurement range
Determine the range of pressure to be monitored, including minimum and maximum pressure values. This should be determined according to the specific application scenario, for example, in the hydraulic system, the pressure switch of the appropriate measurement range needs to be selected according to the working pressure of the system.
Ensure that the pressure switch measurement range is selected to fully cover the pressure variation range in the actual application, so as to avoid the situation that the pressure exceeds the measurement range and cannot be accurately monitored or the pressure switch is damaged.
Second, precision requirements
Select the pressure switch with the right accuracy level according to the accuracy requirements of the application. High-precision pressure switches are usually more expensive but provide more accurate pressure monitoring.
For some occasions with strict pressure control requirements, such as precision instruments and equipment, medical equipment, etc., it is necessary to select a pressure switch with higher precision; For some general industrial applications, the accuracy requirements can be relatively low.
Three, output signal type
There are a variety of output signal types of pressure switches, common are normally open (NO) and normally closed (NC) contact output, analog output (such as 4-20mA, 0-5V, etc.), digital signal output.
Select the appropriate output signal type according to the requirements of the control system. If the control system needs to receive the switching signal for simple logical control, then the pressure switch output by the normally open/normally closed contact may be sufficient; If continuous pressure monitoring and precise control is required, the pressure switch with analog output can be selected; The pressure switch of digital signal output is suitable for digital control system.
4. Working environment
Consider the operating environmental conditions of the pressure switch, including temperature, humidity, vibration, corrosion and other factors
If the working environment temperature is high or low, it is necessary to select a pressure switch that can work normally within the corresponding temperature range; If the ambient humidity is high or there is corrosive medium, the pressure switch with waterproof, moisture-proof and corrosion resistance should be selected; If the working environment has strong vibration, it is necessary to choose a pressure switch with good vibration resistance.
5. Installation method
There are many ways to install the pressure switch, such as threaded connection, flange connection, plug-in installation, etc.
Select an appropriate installation mode based on actual installation conditions and requirements. For example, a pressure switch with a choice of threaded or flanged connections is installed on a pipeline; In some special occasions, such as small Spaces or the need for quick installation, you can choose a plug-in mounted pressure switch.
6. Brand and quality
Choose well-known brands and reliable quality pressure switches to ensure stable performance and long life.
You can refer to the evaluation of other users, the certification of the product (such as CE, UL, etc.) and the credibility of the manufacturer to evaluate the brand and quality of the pressure switch.
Vii. Price and cost
Under the premise of meeting the performance requirements, consider the price and cost of pressure switches. Different brands, different models of pressure switch prices may have a big difference.
At the same time, it is also necessary to consider the maintenance cost and service life of the pressure switch to comprehensively evaluate its cost performance.
