Chino KP 2000 Series, Instructions Manual

Page: 125 / 144

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15. Explanation of terms
Term Explanation
Unit
Only for thermocouple or resistance thermometer select
°
C or K.
Operation equation is as follows.
・
°
C = K - 273.15
・
K =
°
C + 273.15
RJ
(Reference Junction)
Thermocouple has measurement junction (temperature measurement side) and
reference junction (electromotive force generation side) and reference junction
decides the standards of thermo-electromotive force table (with scale) at 0
°
C
condition.
▢
Measuring junction
◉
Reference junction
▢
When connecting the thermocouple to terminal of the controller, usually the
temperature of the terminal becomes same as the surrounding temperature and is not
0
°
C. As a result, unless that temperature is compensated correct temperature cannot
be measured. That compensation that is done automatically in the product internally is
called the compensation function 'RJ'.
Sensor correction
It is a function that corrects the PV (measurement value).
It can also be used as zero point adjustment of sensor signal.
PV decimal point
It is a function that enables the selection of decimal point function of PV (measurement).
Decimal point position can be selected from 5 digits display.
SV decimal point for
display
This is a function for changing position of the decimal point of SV at the upper display.
For example, when number of digits after decimal point is not displayed, use this
function.
Digital filter
It is a filter function on the operation having first order lag in PV (measurement value).
Setting value of digital filter is equivalent to time constant (T), and when PV is
changed during step condition it is equivalent to the time (seconds) to reach
approximately 63%.
A
0.63A
PV lag due to digital filter
T
T: Digital filter (0.0
－
99.9 seconds
）
Original PV change