Burkert 8285 El. COND Mode D'emploi page 59

• Function characteristic
Nonlinear output current characteristic: allows measurements over several
decades, e.g. measuring very low values with a high resolution
and high values with a low resolution.
Required: Entering a value for 50 % output current
Output current
Y
[%]
100
50
Entry for "50 % point":
e.g.:
10 % of measured value
0
Equation
Output current (4 ... 20 mA) =
E + I - 2 * X50%
K =
X50% - A
I: Initial value at 4 mA
X50%: 50% value at 12 mA (output current range 4 to 20 mA)
E: End value at 20 mA
M: Measured value
Logarithmic output curve over one decade:
I: 10 % of maximum value
X50%: 31.6 % of maximum value
E: Maximum value
Logarithmic output curve over two decades:
I: 1 % of maximum value
X50%: 10 % of maximum value
E: Maximum value
X
Measured variable
End
(1+K)x
16 mA + 4 mA
1+Kx
x =
M - I
E - I
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