Selection of pressure transmitters and differential pressure transmitters
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As shown in the diagram, the standard SHT 3005 states that a differential pressure transmitter should be used when measuring low pressures. What is typically considered to be the value of such low pressure? For example, 5 KPA or 10 KPA?
5KPa and 10KPa are considered very low pressures, and only differential pressure transmitters can be used for measurement.
We generally refer to pressures between 1 and 2 standard atmospheres as micropressures.
Below 1 kPa or 500 Pa, use micropressure; below 5 kPa, use differential pressure; below -50 kPa, use absolute pressure
. There’s no need to worry about what micro-pressure is. The measurement principles for pressure, differential pressure, and micro-pressure in transmitters are the same; the difference lies only in the size of the measuring elements and the structure of the measuring chamber. Just choose one with a suitable range. .