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How should an earth pressure sensor be wired when measuring pipeline pressure?
Published Time:
2022-12-02 15:23
Source:
Soil pressure measurement is an important task in the theoretical research of soil mechanics and engineering testing. Using soil pressure sensors, the contact stress between the surface of structures such as subgrades, retaining walls, dams, and roads and the soil medium, as well as the original stress state of the soil layer, can be obtained. This is used to evaluate the working state of the construction site and verify the soil stress distribution theory. Soil pressure sensors are often used to measure the stress in soil such as airport runways, railway embankments, highway subgrades, and earth-rock dams, and to measure the soil pressure exerted on underground oil, gas, and water pipelines, protective engineering, subways, tunnels, and other underground structures. How should the soil pressure sensor used to measure pipeline pressure be wired?
Wiring method for soil pressure sensors measuring pipeline pressure:
The wiring of soil pressure sensors is one of the frequently asked questions from customers during the procurement process. Many customers do not know how to wire the sensor. In fact, the wiring methods of various sensors are basically the same. Generally, there are two-wire, three-wire, and four-wire systems, and some even have five-wire systems.
The two-wire system is relatively simple, and generally customers know how to wire it. One wire connects to the positive power supply, and the other wire, which is the signal wire, connects to the power supply through the instrument. This is simple. The three-wire system adds a wire to the two-wire system, and this wire is directly connected to the negative power supply, which is a bit more troublesome than the two-wire system.
The four-wire soil pressure sensor certainly has two power input terminals and two signal output terminals. Most four-wire systems have voltage output and are mostly made into two-wire systems. Some signal outputs are not amplified, and the full-scale output is only tens of millivolts, while some pressure sensors have internal amplification circuits, and the full-scale output is 0~2V. As for how to connect to the display instrument, it depends on the range of the instrument. If there is a suitable range for the output signal, it can be measured directly; otherwise, a signal adjustment circuit needs to be added.
The five-wire soil pressure sensor is not much different from the four-wire system, and there are relatively few five-wire sensors on the market.
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