5-6
Chapter 5. Functions
Reference junction compensation (cold junction compensation)
If the PV input type is thermocouple, either one of the options below can be selected:
• This device does reference junction compensation (cold junction compensation).
• This device does not do reference junction compensation (cold junction
compensation) because an external cold junction compensation device (ice bath,
etc.) is used.
Item (bank) Display Description Initial value User level
Reference junction compensation
(cold junction compensation)
(setup bank)
C 03
0: Internal compensation (by this device)
1: External compensation (by another
device)
0 Advanced
PV square root extraction dropout
If the PV input type is DC voltage/current, a dropout value can be set so that the
result of the PV square root extraction used to convert the pressure (differential
pressure) into the flow becomes “0.”
Item (bank) Display Description Initial value User level
PV square root extraction dropout
(setup bank)
C 09
0.0 %: PV square root extraction is
not performed.
0.1 to 100.0 %
0.0 % Advanced
• If the PV input type is DC voltage/current, this item is displayed and the setting
can be changed.
• Details of PV square root extraction
The calculation input in % and the calculation result in % are expressed as PV
in
and PV
out
, respectively.
If the PV input is greater than or equal to the PV square root extraction dropout
value and is less than 100.0 %, the calculation formula will be:
PV
out
= √PV
in
/ 100 × 100
If the PV input is more than 0.0 % and is smaller than the PV square root
extraction dropout value, PV
out
= 0.0 %.
If the PV input is 0.0 % or less, or 100.0 % or more, the PV square root is not
extracted, so PV
out
= PV
in
.
Output after square root extraction (PV
out
100 %FS
PV
in
Dropout value (0.1–100.0 %, variable)
0
100 % FS
0
Y = X
in/100 ×100
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