Help needed: for the EJA pressure transmitter with a range of 0–2.0 MPa, the control room display shows 0.3 MPa. What is the reading on the transmitter at the site?
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How do I convert it?
The measurement value displayed continuously on the monitor remains the same as that shown in the control panel, provided there is no migration.
I don’t know what you want to ask; aren’t they values just like in reality?
The pressure transmitter – the value indicated by the field transmitter is the actual measured value. The range of the field instruments is 0-2.0 MPa. Under normal conditions, the range in the control room is the same as that of the field instruments, namely 0-2.0 MPa; therefore, the values displayed on the field instruments and those in the control room are identical, at 0.3 MPa. If the range in the control room is not 0-2.0 MPa (which generally does not happen), then a conversion is required. That is, field instrument value/field instrument range = control room value/control room range.
0 corresponds to 4 mA, and 2 MPa corresponds to 20 mA; by using this proportion, the current corresponding to 0.3 MPa can be calculated.
It depends on whether what is displayed on site is current or pressure
If the ranges on both sides are the same and no migration has been performed on-site, the display will be identical； If the ranges are different, you need to check what the ranges on each side are, and perform calculations, just like in the method used on the fourth floor. If the measurement ranges are the same and a migration has been performed on-site, the value displayed on-site is the value shown in the control room plus the migration amount
Can’t you go and take a look in person?
What is the range on the control room side?
Generally, transmitters either display the pressure value or a percentage