17
TAB_XY_VALUE5 = 0,8; 300
TAB_XY_VALUE6 = 1,6; 400
TAB_XY_VALUE7 = 3,2; 500
TAB_XY_VALUE8 = 6,4; 600
TAB_XY_VALUE9 = 12,8; 700
TAB_XY_VALUE10 = 25,6; 800
(Output will readout 325% with 1,0% potentiometer value)
2.6.13 Measurement of TC (with Custom Polynomial Linearisation) on sensor 1
PRIMARY_VALUE_UNIT = K, °C, °F or °R
LIN_TYPE = Custom defined TC
LIN_TYPE_2 = N/A (ignored in setup check)
SENSOR_MEAS_TYPE = PV = SV_1, SV_2 not available
SENSOR_CONNECTION = N/A (ignored in setup check)
SENSOR_CONNECTION_2 = N/A (ignored in setup check)
RJ_TYPE = No Reference Junction, Internal, External (constant value) or
Sensor 2-wire or Sensor 3-wire
Connections:
Now enter the Custom TC parameters in PR_CUST_LIN Block (PA Slot 4). See 2.9.4 Custom
Polynomial Linearisation, Parameter List for further details.
Remember to enter values for the RJ polynomial if RJ_TYPE is any value other than “No ref
-
erence Junction”.
Example:
The parameters and coefficients for converting a special TC to a linear temperature signal.
CUSTOM_TC_NAME = Custom TC Example
CUSTOM_TC_POLY_COUNT = 5
CUSTOM_TC_MIN_IN = -6500.0
CUSTOM_TC_MIN_OUT = -100.0
CUSTOM_TC_MAX_OUT = 1200.0
A TC input of 5000 µV and an RJ temperature of 25ºC will make POLY_3 the active and the
output will be:
U
RJ
= -3.94
*
10
-1
+ 3.94
*
10
1
*
25 + 2.65
*
10
-2
*
25
2
- 1.11
*
10
-4
*
25
3
= 1000 µV
This voltage is to be added to the TC voltage (5000 + 1000), and the resulting temperature will be:
4.18 + 2.26
*
10
-2
*
6000 + 1.41
*
10
-7
*
6000
2
+ 1.50
*
10
-11
*
6000
3
- 1.35
*
10
-15
*
6000
4
= 146.3 °C
See 2.9.3 Custom polynomial linearisation, Description for formula and further details.
CUSTOM_TC_POLY_X
max. input
limit in µV
for POLY_X
4
th
degree
coefficient
for POLY_X
3
th
degree
coefficient
for POLY_X
2
th
degree
coefficient
for POLY_X
1
st
degree
coefficient
for POLY_X
0 degree
coefficient
for POLY_X
CUSTOM_TC_POLY_1 -3200.0 -3.84E-13 -5.65E-9 -3.36E-5 -6.10E-2 -8.44E1
CUSTOM_TC_POLY_2 3500.0 -8.13E-15 7.29E-11 -4.18E-7 2.53E-2 -1.08E-2
CUSTOM_TC_POLY_3 10000.0 -1.35E-15 1.50E-11 1.41E-7 2.26E-2 4.18
CUSTOM_TC_POLY_4 30000.0 3.49E-18 2.19E-12 -1.53E-7 2.68E-2 -9.26
CUSTOM_TC_POLY_5 70000.0 6.27E-17 -8.76E-12 5.34E-7 8.69E-3 1.65E2
3
th
degree
coefficient
2
th
degree
coefficient
1
st
degree
coefficient
0 degree
coefficient
CUSTOM_TC_RJ_POLY -1.11E-4 2.65E-2 3.94E1 3.94E-1
(24 pages)
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