User Manual

Publication 1746-UM003A-EN-P
Channel Configuration, Data, and Status 4-11
Scaling Examples
The following examples are using the default scaling ranges:
Scaled-for-PID to Engineering Units
Equation:
Assume that the input type is an RTD, Platinum (200
Ω, a = 0.00385°C,
range = -200°C to +850°C), scaled-for-PID display type. Channel data = 3421.
Want to calculate °C equivalent.
From Channel Data Word Format, S
LOW
= -200°C and S
HIGH
= 850°C.
Solution:
Solution:Solution:
Solution:
Engineering Units to Scaled-for-PID
Equation:
Assume that the input type is an RTD, Platinum (200
Ω, a = 0.00385°C,
range = -200°C to +850°C), scaled-for-PID display type. Desired channel
temperature = 344°C.
Want to calculate Scaled-for-PID equivalent.
From Channel Data Word Format, S
LOW
= -200°C and SHIGH = 850°C.
Solution:
Engr Units Equivalent SLOW SHIGH - SLOW()
Scaled-for-PID value displayed
16383
-------------------------------------------------------------------------------


×
+=
Engr Units Equivalent 200°C 850°C - (-200°C)()
3421
16383
--------- ------


×
19.25°C=+=
Scaled-for-PID Equivalent 16383
Engr Units desired - SLOW
()
SHIGH - SLOW()
------- ----------------------------- -------------- ------------------------
×=
Scaled-for-PID Equivalent 16383
344°C -200°C
()+
850°C- (-200°C)
--------- ---------- ---------- ------------------
× 8488==