- 11 -
INZ-TN2ZSVS-E
•
Instantaneous value and concentration value:
The concentration display of Ch (component) where sampling components such as “CO
2
,” “CO” or
“O
2
are displayed in the component display, indicates current concentration values of the measured
components contained in gas that is now under measurement.
•
O
2
correction concentration values:
Ch components where “cv**” is displayed as “cv CO” in the component display are calculated from
the following equation, by setting sampling components, O
2
instantaneous/concentration values and
O
2
correction reference value.
Correction output=
On: The value of the O
2
correction referance value
(Value set by application)
Os: Oxygen concentration (%)
Cs: Concentration of relevant measured component.
Calculation is made with 20Vol% if Os is 20Vol%
or higher.
The corrected sampling components is CO only.
•
O
2
correction concentration average value:
In the Ch (component) where “ **” is displayed as “ CO” in the component display, a
value obtained by averaging O
2
correction concentration value in a fixed time is output every 30
seconds.
Averaging time can be changed between 1 minute and 59 minutes or 1 hour and 4 hours accord-
ing to the average time settings.
(The set time is displayed as “1h,” or instance, in the range display.)
Note) The measurement ranges of O
2
correction concentration value and O
2
correction concen-
tration average value are the same as that of the measuring components.
•
CP calculation value:
The carbon potential of carburizing furnace and conversion furnace are calculated using furnace
temperature (fixed input value) and CO concentration value (fixed or measured value) while
referring to CO
2
measured value.
Calculation equation;
where,
CPS ; Saturated carbon concentration (partial pressure)
0.0028t–1.30 (800˚C
≤
850˚C)
0.0030t–1.47 (850˚C
≤
950˚C)
0.0034t–1.85 (950˚C
≤
1000˚C)
t
; Furnace temperature
PCO ; CO concentration value (partial pressure)
PCO
2
; CO
2
concentration value (partial pressure)
K1
; Constant K1=10
(9.06–15966/T)
T
; Rankine temperature
(t
×
9/5+32+460)
CV
AV
CV
AV
×
Cs
21 - On
21 - Os
CP=
CPS
×
(PCO)
2
K1
×
PCO
2
