The first thing to understand about instrumentation is the measurement environment. LEFOO Pressure Control and Sensing Technology Expert. Choose Pressure Switch, Select Pressure Switch,buy Pressure Switch, Pressure Switch factory manufacturer supplier distributor.
Fluid Media
Just like which transportation needs to be considered? Walk, car, subway, boat or plane. The fluid compatibility with materials of construction must be considered. Consult switch manufacturers catalog. Or communicate with the manufacturer in time.
Most of LEFOO's products are suitable for liquids and gases. Such as water, oil, refrigerants,air,CO2,CO. This is called Universal Pressure Switch or just pressure switch. This is the most common type of pressure switch on the market. LF08
If subdivided, there are pressure switches that are particularly suitable for some environments. From industrial oil to food grade medium ,LEFOO have oil pressure switch and Water purifier pressure switch. These are products specially made for the characteristics of the industry.
We also have specialized products in the refrigeration and HVAC industries.Refrigerant,air,CO2,CO, If you only use generic models, the expected results may not be achieved. LF55 LF31 LF32
Proof Pressure
Proof pressure is the highest pressure that the switch will stand without permanent deformation, and usually defined as 1½ times maximum working range. Although a pressure gauge in a system may show a constant operating pressure, there may be surges which are dampened by the orifice in the gauge which would damage diaphragm and Bourdon tube elements in a pressure switch. For this reason, the working range should extend well above the actual operating point. LF20 Extended Duty Pressure Switch have a long service life, it will not be destroyed by temporary abnormal pressure. It’s LF08 Universal Pressure Switch‘s upgraded version.
Pressure range
If you are a professional technician, you will definitely request the pressure range and operating pressure of the pressure switch in advance. At the same time, this is also the main factor that determines the price of pressure switches.
It can be as small as wind movement, slight water flow, and as large as the pressure of machinery such as water pump and air compressor. We have a variety of measurement units to choose from: Pa kPa MPa, mbar bar, psi, kgf, water column and more.
In addition to the basic use environment selection, the working principle and specific parameters of the pressure switch are also divided into many kinds.
Working principle
Expected life is usually limited by the type of pressure sensing mechanism - Bourdon tube, diaphragm, piston, Belleville spring, etc.
Diaphragm and Bourdon tube pressure switches generally have greater accuracy than piston switches, and would be preferred where accuracy is important, provided they meet requirements for service life and speed of cycling.
Switches with Belleville spring (snap action) seem to provide the greatest repetitive accuracy, but the manufacturer should be contacted on life expectancy of the spring.
Of course, some pressure switches are normally open or normally closed, and some are adjustable?even there are differential pressure switch. They all have applicable scenarios.
Number of pressure ports
1.Standard pressure switches sense a single pressure source and open or close a single set of contacts.
2.Differential pressure switches have two connections and sense the pressure difference across a circuit.
3.Dual switches sense a high and low limit on the same pressure source, and actuate two sets of electrical contacts. Wide range dual pressure sensing can be accomplished with two standard pressure switches. See diagram below.
Temperature Range
The operating temperature is generally normal temperature, and the high-temperature medium can be passed to the safe outdoor temperature through the pipe, or we have a dedicated steam pressure switch.
Electric Rating
According to needs you can choose resistive(6V 12V 24VDC) and inductive(120 240VAC).
Screw thread Connection & Terminals
1/8"NPT Male, 1/4"NPT Male, G1/8" Male, G1/4" Male… The stock has a conventional threaded connection, if you need to customize, please contact Business.
#8-32 screws, 1/4” blade, Metri-Pack,wire leads…You can use a suitable method to connect to the device terminal.
Industrial products are not like daily necessities. You can only choose the appearance color. It is highly customizable and can be used in a variety of work situations.
Of course, you still need to communicate with the business when purchasing, and select the product according to the specific product catalog pdf.
