FEC920: USER GUIDE
Page 103
September 18
SCALING INFORMATION
When PV = Scale Low, Output = output low value. When PV = Scale high, Output = output high value. The PV
is mapped via the scale range onto the output range according to the equation:
6.11 USER LIN
Allows the entry of up to four user linearization tables, any one of which can be selected as ‘Lin Type’ in Channel
configuration (Section 6.4.1). Configuration consists of defining the number of points to be included (2 to 32)
and then entering an X and a Y value for each point, where X values are the inputs and the Y values are the
resulting outputs.
6.11.1 User linearization table rules
1.
Tables must be monotonic - i.e. there may not be more than one X value with the same Y value assigned
to it.
2
Each X value must be greater than the preceding one.
3.
Each Y value must be greater than the preceding one.
4.
If units other than temperature units are to be displayed, the channel scale high and scale low values
should be set to the same as the range high and low values, and the required scale units entered.
Figure 91 shows the first part of the configuration table for an imaginary cylinder example.
Figure 91 User Linearization table example
When configuring a channel (Section 6.4.1) to use a User linearization table:
If Type = Thermocouple or RTD, then Range High/Low must be set to the highest and lowest ‘Y’ values to be
used, respectively. The instrument automatically looks up the associated ‘X’ mV or Ohms values.
If Type = mV, V or mA, then Range High/Low must be set to the highest and lowest ‘Y’ values to be used,
respectively. Input High/Low should be set to the highest and lowest ‘X’ values in the table, respectively.
Point
pair
Depth (metres)
Vo
lu
me
(cu
b
ic
me
tre
s)
12
0.00
0.00
0.50
0.07
1.00
0.58
Num. of Points
X1
Y1
X2
Y2
X3
Y3
User Lin.1
A5E45696052A Rev-AA
