The factory equipment has a pressure sensor (air duct), 2 wire, 4-20 output, no digital display, received PLC, when there is no wind output more than 5 Ma (PLC control), to zero, the pressure sensor apart to see a red a little green knob, who knows this 2 small knob function? If one is zero, what's the other one for? A variety of reasons, now can not see the sensor models and manufacturers
One is the zero adjustment "zero", and when the zero point has a small drift, the potentiometer can be adjusted directly;The other is the "span" that adjusts the measuring range during instrument calibration (calibration)". When the meter deviation, or to the effective range, small range change range of instrument adjustment when this button, of course, also have the corresponding adjustment of "zero", after a few "range" "zero" synchronous adjustment, changes to the range of hope.The pressure sensor is one of the most commonly used sensor in industrial practice, which is widely used in various industrial control environment, involving water conservancy and hydropower, railway transportation, intelligent buildings, production automation, aerospace, military, petrochemical, oil, electric power, shipbuilding, machine tools, plumbing and other industries, following a brief introduction of some commonly used sensor principle and its application. Another medical pressure sensor.
Hello, one is the upper limit and one is the lower limit. Adjust output 4 and 20!
One is the zero adjustment "zero", and when the zero point has a small drift, the potentiometer can be adjusted directly;The other is the "span" that adjusts the measuring range during instrument calibration (calibration)". When the meter deviation, or to the effective range, small range change range of instrument adjustment when this button, of course, also have the corresponding adjustment of "zero", after a few "range" "zero" synchronous adjustment, changes to the range of hope.
