Yokogawa Touch Screen GP20 - Manual (Page 27)

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IM 04L51B01-01EN
Configuring the GX/GP
1
2
3
4
5
App
Span Lower, Span Upper
Set the input range. The selectable range varies depending on the range setting.
For the selectable ranges, see “Range Details.”
Note
• You cannot set the same value to Span Lower and Span Upper.
Calculation
When performing input calculation, set the calculation type.
• Linear scaling
Converts the unit to obtain the measured value.
Input value Measured value
10 V
0 V
300°C
–100°C
• Delta
Difference calculation. The measured value of the channel is set to the difference with
respect to the measured value of the reference channel.
Input value Measured value
Measured value on the reference channel
—
Note
Difference calculation is executed even if the input type or range is not the same between the
difference calculation channel and the reference channel.
Differences in the decimal place and unit are ignored in the calculation. Then, the decimal place
and the unit of the difference calculation channel are applied.
Example 1: If the input value of the difference calculation channel is 10.00 and the measured value
of the reference channel is 100.0, the calculated result is 10.00 – 100.0 = –90.00.
Example 2: If the input value of the difference calculation channel is 10.00 V and the measured
value of the reference channel is 5.00 mV, the computed result is 10.00 V – 5.00 mV =
5.00 V.
• Square Root
Takes the square root of the input value and converts the unit to obtain the measured
value.
In a differential pressure flowmeter, the output signal is proportional to the square of the
flow rate. Therefore, to measure on a recorder, square rooting is required.
Input value
Measured value
a
b
x
a b
B
B
X
A
A
X = (B – A) + A
x – a
b – a
Reference channel
Set the reference channel for the difference calculation.
1.2 Configuring AI Channels (Analog input (including DI) channels)