Simex SPT-86L, User Manual

Page: 15 / 24

User manual for RTD,TC,mV/4-20mA converter module SPT-86L
example if input voltage is equal -9.38 mV then U
n
= -9.38/100
=
-0.0938, and if input voltage is
equal 103.13 mV then U
n
= 103.13/100
=
1.0313.
Example 3: The linear characteristic
Let assume the input mode ”0-100” is chosen. Parameter ”
InputLow
” and ”
InputHigh
” equal
to -300 and 1200 respectively. The calculations will be done for three different input voltages
from example 2.
a) U
inp.
= 37.5 mV and U
n
= 0.375
Accordingly to expression on page 12 for linear characteristic:
0.375 × [1200 -(- 300)]
≅
562 and next, the ” InputLow ” value is added to the result, so
the returned value equals:
W
≅
562 + (-300) = 262
b) U
inp.
= -9.38 mV and U
n
= -0.0938.
W
≅
-441.
c) U
inp.
= 103.13 mV and U
n
= 1.0313.
W
≅
1247.
Example 4: The square characteristic
Let assume the input mode ”0-100” is chosen. Parameter ”
InputLow
” and ”
InputHigh
” equal
to -300 and 1200 respectively. The calculations will be done for three different input voltages
from example 2.
a) U
inp.
= 37.5 mV and U
n
= 0.375
Accordingly to expression on page 12 for square characteristic:
(0.375)
2
× [1200 -(- 300)]
≅
211 and next, the ” InputLow ” value is added to the result, so
the returned value equals:
W
≅
211 + (-300) = -89.
b) U
inp.
= -9.38 mV and U
n
= -0.0938.
W
≅
-287.
c) U
inp.
= 103.13 mV and U
n
= 1.0313.
W
≅
1295.
Example 5: The square root characteristic
Let assume the input mode ”0-100” is chosen. Parameter ” InputLow ” and ” InputHigh ” equal
to -300 and 1200 respectively. The calculations will be done for three different input voltages
from example 2.
a) U
inp.
= 37.5 mV and U
n
= 0.375
Accordingly to expression on page 12 for square root characteristic:

0,375 × [1200 -(- 300)]
≅
919 and next, the ” InputLow ” value is added to the result,
so the returned value equals:
W
≅
919 + (-300) = -619.
15