Parallel Shift (Offset Shift) - ABB 265DS Operating Instruction

8.4.1

Parallel shift (OFFSET SHIFT)

This function performs an offset shift of the characteristic so that it travels through a point
specified by the user. This makes it possible to set the output signal of several measuring
devices that measure the same process variable to the same value, without the need to perform
calibration with applied pressure.
Fig. 19: Offset shift
1 Old zero
2 New zero
3 New balance point
4 Offset shift
This function can be performed at any point on the characteristic, provided that the following
circumstances apply:
• The process variable is within the set measuring range. The pressure transmitter has a linear
transmission characteristic.
• Entering the desired output current as a percentage performs an offset shift for the
measuring range.
• When pressure px is applied, the pressure transmitter displays the standardized output value
x1 as a percentage. Based on the current application, however, the value x2 should be
displayed. The value x2 is now set via the local control unit/LCD. The transmitter calculates
the new zero and the new end value, and adopts these settings (see Fig. 19, Offset shift).
IM/265D/V-EN-02
p
4
3
px
2
1
0
X2
265Dx, 265VS
5
6
7
X1 100 % I [mA]
5 New end value
6 Old end value
7 Old balance point
Configuration
A
M00033
51