Introduction to Hersmann sensor technology
The two-wire system of Hirschmann pressure sensor is relatively simple, one wire is connected to the positive pole of the power supply, and the other line is the signal line connected to the negative pole of the power supply through the instrument, which is the simplest, the three-wire system of the pressure sensor in Germany Hirschmann is based on the two-wire system and adds a line, which is directly connected to the negative pole of the power supply, which is a little more troublesome than the two-wire system.
A four-wire Hirschmann pressure sensor is definitely two power inputs, and the other two are signal outputs. Most of the four-wire system is voltage output rather than 4-20mA output, and 4-20mA is called pressure transmitter, and most of them are made into two-wire system. Some of the signal output of Hess pressure sensors in Germany is not expanded, and the full-scale output is only tens of millivolts, while some pressure sensors have an enlarged circuit internally, and the full-scale output is 0-2V. As for how to receive the display appearance, it depends on how large the range of the appearance is, if there is a gear suitable for the output signal, you can measure it directly, otherwise you need to add a signal adjustment circuit. Five-wire pressure sensors are not much different from four-wire systems, and there are fewer five-wire sensors on the market.
Functional indicators of Hersmann pressure sensors:
Measuring medium: liquid or gas (non-corrosive to stainless steel housing)
Range: 0-10MPa
Accuracy class: 0.1%FS, 0.5%FS (optional)
Stable function: ±0.05%FS/year; ±0.1% FS/year
Output signal: RS485, 4-20mA (optional)
Overload ability: 150% FS
Zero point temperature coefficient: ±0.01%FS/°C
Full temperature coefficient: ±0.02%FS/°C
Degree of protection: IP68
Ambient temperature: -10°C——80°C
Storage temperature: -40°C - 85°C
Power supply: 9V-36V DC;
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Overview of Hersmann pressure transmitters.
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