Siemens SITRANS P500, Руководство по эксплуатации, Страница: 85 / 238

Operate
6.2 Parameter description
SITRANS P500 with HART
Operating Instructions, 12/2014, A5E02344528-09
85
"2.1.2.2 With pressure input"
"2.1.2.2.1 Pressure Unit"
Factory setting: mbar
Setting range: inH
2
O, inHg, ftH
2
O, mmH
2
O, mmHg, psi, bar, mbar, g/cm
2
, kg/cm
2
, Pa, kPa,
HPa, Torr, atm, MPa, inH
2
O (4 °C), mmH
2
O (4 °C)
Purpose: Selection of the unit for the pressure parameter
Description: This parameter allows you to select the unit for the measured pressure
value. The parameters associated with this unit are automatically converted
to the new unit.
"2.1.2.2.2 Set LRV with Pressure"
Setting range: Within sensor limits
Purpose: Setting the start of scale value
Description: Use this parameter to set the start of scale value to the current pressure
value. The change to the start of scale value causes a respective change to
the full scale value, so that the range remains constant. Should the move-
ment of the full scale value violate an upper or lower sensor limit, setting of
the start of scale value is rejected.
"2.1.2.2.3 Set URV with Pressure"
Adjustment range: Within sensor limits
Purpose: Setting the full scale value
Description: Use this parameter to set the full scale value to the current pressure value.
The change to the full scale value has no effect on the start of scale value.
This means that the span changes. If the full scale value is less than the
start of scale value, a falling characteristic curve can be achieved. The full
scale value must be within the sensor limits and the span must not fall below
the minimum, otherwise setting of the full scale value will be rejected.
"2.1.3 Trim Mounting Offset"
"2.1.3.1 Perform Trim"
Purpose: Correction of the zero point error, which is derived from the mounting posi-
tion, among other things.
Description: The position error and zero point error correction compensates for the errors
caused by the chosen installation position. After the position error correc-
tion, the pressure transmitter shows the pressure measurement value 0.0 in
the respective units.