FISCHER PRO-LINE DE90, Operating Manual

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5 | Operation FISCHER Mess- und Regeltechnik GmbH
52 BA_EN_DE90
5.5.1.2.6 Zero-point window C1
Directory: \Configuration\Channel 1\Measurement C1\Zero-pt. window C1
Level: 4
Zero-pt. window C1
1 2 3 4
OK Cancel Edit
000.000
Pa
U
Fig. 66: Zero-point window C1
Unsteady readings are not usually a problem during normal operating mode, but
this is not true for the idle state, if a measured value of zero is expected. The
parameter
Zero-pt. window C1
is designed to solve this.
The value range is one third of the basic measuring range.
Differential pressure
Display value
-x -2x x 2x
Zero-point window
Fig. 67: Zero-point window
The parameter value (x) defines a range around zero, the so-called zero-point
window. All measured values within this window are displayed as a zero value.
The reading will only no longer show zero, if the pressure lies outside the set
window.
In this area, approximation is linear up to twice the parameter value (2x). Only
when twice the pressure is reached for the zero-point window, the measured
value and the reading match again. This avoids jumps in the display.