Electrical circuit for pressure sensors: when is really a sensor active, so when passive?
When using pressure sensors, the output signals 0 ? 20 mA, 4 ? 20 mA and DC 0 ? 10 V are frequently chosen in order for the sensor signals to be evaluated and further processed. For this, the signal output of the pressure sensor is normally connected to a corresponding input card in the […]
Temperature calibration with reference probes, dry-well calibrators and baths
Can dry-well calibrators and calibration baths be used as internal references? Money -well calibrators and baths are a practical solution for temperature calibrations. This is true both in the field and in laboratories, as they provide a free-standing, stable temperature source with a built-in platinum resistance thermometer (PRT).The PRT measures the temperature inside the dry-well […]
Difference of 4-20 mA in 2-wire and 3-wire technology in pressure sensors
What exactly is the difference between your 4-20 mA output signal in 2- and 3-wire technology? This question is answered best from the viewpoint of the user: An output signal in 2-wire technology means:less wiring requiredbetter EMC protection, since interferences could be filtered more easilybetter protection against wiring errorsThe only benefit of 3-wire technology is […]
Advantages of diaphragm pressure gauges (1): Measurement of low pressures
Diaphragm pressure gauges are considered as specialists in the process industries. They come into play when Bourdon tube pressure gauges reach the limits of their performance. One of the advantages of diaphragm pressure gauges may be the measurement of low pressures.Diaphragm pressure gauges could be recognised from the first look: From the flanges below the […]