Wiring method for industrial conventional pressure sensors

The wiring of sensors has always been one of the most frequently consulted questions during the customer procurement process. Many customers are unaware of the wiring methods for pressure sensors. In fact, the wiring methods for various sensors are basically the same. Pressure sensors generally have two-wire, three wire, four wire, and some even have five wire systems.

The two-wire system for pressure sensors is relatively simple, and most customers know the wiring method for pressure sensors. One wire is connected to the positive pole of the power supply, and the other wire, which is the signal wire, is connected to the negative pole of the power supply through the instrument. Yes, the three wire system for pressure sensors adds a wire on top of the two-wire system, which is directly connected to the negative pole of the power supply, which is a bit more complicated than the two-wire system. The four wire pressure sensor definitely has two power input terminals, and the other two are signal output terminals. The four wire system is mostly voltage output rather than4~20mAOutput,4~20mAIt is called a pressure transmitter, and most of them are made in a two-wire system.

The signal output of some pressure sensors is not amplified, with a full-scale output of only a few tens of millivolts, while some pressure sensors have amplification circuits inside, with a full-scale output of0~2VAs for how to connect to the display instrument, it depends on the range of the instrument. If there is a gear that is compatible with the output signal, it can be directly measured. Otherwise, a signal adjustment circuit needs to be added. The difference between five wire pressure sensors and four wire sensors is not significant, and there are relatively few five wire sensors on the market.

Wiring method for pressure sensor-thread type

There are many types of threads for pressure sensors, common ones includeNPTThePTTheGTheMThey are all pipe threads.

NPTyesNaTIonal (American) Pipe ThreadThe abbreviation belongs to the American pressure sensor standard 60 Conical pipe thread, used in North America.National standards can be consultedGB/T12716-1991

PTyesPipe ThreadThe abbreviation is 55 Sealed cone tube thread, belonging to the Wyeth pressure sensor thread family, commonly used in Europe and Commonwealth countries.Commonly used in the water and gas pipe industry, the taper is specified as1:16National standards can be consultedGB/T7306-2000

Gyes 55 Non threaded sealed pipe thread, belonging to the Wyeth pressure sensor thread family.marked asGRepresents cylindrical threads. National standards can be consultedGB/T7307-2001

MIt is a metric ordinary thread, such asM20*1.5Indicating a diameter of20mmThe pitch is1.5If the customer has no special requirements, the pressure sensor is generallyM20*1.5thread.

Additionally, in the thread1/4、1/2、1/8Marking refers to the diameter of the thread size, measured in inches. Insiders usually refer to thread size in minutes, where one inch is equal to8Divide,1/4Inch is2Divide, and so on.GIt seems to be a general term for pipe threads(Guan)，55、60The division of degrees belongs to functional categories, commonly known as pipe circles. The thread is machined from a cylindrical surface.

ZGCommonly known as a pipe cone, the thread is machined from a conical surface. This is how most water pipe pressure joints are made, as indicated by the old national standardRc

Metric threads are represented by pitch, while American and British threads are represented by the number of threads per inch. This is the biggest difference between pressure sensor threads. Metric threads are60Equal sided tooth profile, British thread is isosceles55Dimensional profile, American thread60Degree. Metric threads are measured in metric units, while American and British threads are measured in imperial units.

Pipe threads are mainly used for connecting pressure pipelines, with tight fit between internal and external threads. Pressure sensor pipe threads come in two types: straight pipe and tapered pipe. The nominal diameter refers to the diameter of the pressure pipeline connected, and obviously the larger diameter of the thread is larger than the nominal diameter.1/4，1/2，1/8It is the nominal diameter of the British thread, measured in inches.