Digital Sensor Trim; Digital Sensor Trim Via The Display And Adjustment Module - KROHNE OPTIBAR PM 5060 C Manuel De Référence

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6.9 Digital sensor trim

The digital sensor trim is used to readjust pressure deviations and the measuring range
according to a pressure reference. The zero trim corrects the pressure deviation of the
transmitter at the beginning of the measuring range (LRV), while the span trim corrects the
measuring deviation at the end of the measuring range (URV). In order to perform a digital trim,
an accurate pressure reference is required.
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Figure 6-2: Digital sensor trim
1 Characteristic curve before zero point trim
2 Characteristic curve after zero point trim
3 Characteristic curve before span trim
4 Characteristic curve after span trim

6.9.1 Digital sensor trim via the display and adjustment module

Before the digital sensor trim can be performed, any active offset correction needs to be reset.
Therefore, the value of the sensor mounting correction needs to be set to 0 manually via
Extended adjustment -> Setup -> Sensor mounting correction -> Edit. After the digital sensor Extended adjustment -> Setup -> Sensor mounting correction -> Edit Extended adjustment -> Setup -> Sensor mounting correction -> Edit Extended adjustment -> Setup -> Sensor mounting correction -> Edit
trim has been performed, the effect of mounting position can be corrected again via the
automatic sensor mounting correction.
To perform the digital sensor trim via the display and adjustment module, navigate through the
menu as follows Extended adjustment -> Additional settings -> Special parameters -> SP02 /
SP03 / SP04 SP03 / SP04 SP03 / SP04 SP03 / SP04
The password for access to the special parameters is: SW
Performing the zero point trim (SP02)
To carry out the zero point trim, special parameter SP02 needs to be selected and confirmed. It
needs to be ensured that the system is completely depressurized. The currently applied
pressure is set as the new zero point (LRV) and assigned to the current output value of 4 mA. The
characteristic curve is adjusted on one side during this procedure, so that the end of the
measuring range (URV) remains unaffected.
Performing the span trim (SP03)
To perform the span trim, special parameter SP03 needs to be selected and confirmed. It needs
to be ensured that the applied pressure reference corresponds to the desired end of the
measuring range (URV). The currently applied pressure is set as new span (URV) and assigned to
the current output value of 20 mA. The characteristic curve is adjusted on one side during this
procedure, so that the lower range value (LRV) remains unaffected.
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Extended adjustment -> Additional settings -> Special parameters -> SP02 / Extended adjustment -> Additional settings -> Special parameters -> SP02 / Extended adjustment -> Additional settings -> Special parameters -> SP02 /
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01/2021 - 4004819802 - MA OPTIBAR PM 5060 C R04 fr