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Standard Function
• Zero gas flow time:
180 to 999 sec (settable in 1-sec step)
• Auto indication off:
Indication automatically turns off when no
key is operated for the determined period
of time in the standby status.
Light off time; OFF/ON (1 to 30 min)
• Output holding: At calibration during measurement, out-
put holds the value just before the cali-
bration according to hold setting. In the
standby status, output will not be held.
Indication will not be held either.
Hold setting; OFF/ON
• Key lock:
None of the set values can be changed
when key lock is turned ON.
This is helpful for reducing operation er-
rors and wrong inputs.
• Instrument/calibration error indication:
When the instrument or calibration is ab-
normal, an error number is indicated to
help analysis of the error.
• O
correction:
Conversion of measured CO gas concen-
2
trations into values at standard O
centration
Calculating equation;
C; Sample gas concentration after O
correction
Cs; Measured concentration of sample
gas
Os; Measured O
On; Standard O
sion (settable within 0 to 19%)
The result of conversion is indicated and
output in a signal simultaneously.
* An Os value of 20% or more is taken as
20% for calculation.
• Averaging after O
correction;
2
The result of O
to moving average for the determined pe-
riod of time. And the result of averaging
is indicated and output in a signal simul-
taneously.
Average value will be taken at a cycle of
30 sec. (Indication and output are up-
dated every 30 sec.)
• Resetting of output average value:
Indication and output of average value are
cleared in response to resetting.
* Effective only when average value se-
lection is specified in CODE SYMBOLS.
INZ-TN2ZSVS-E
(settable in 1-min step)
con-
2
21–On
× Cs
C=
21–Os
concentration
2
concentration for conver-
2
correction is subjected
2
• CP calculation: The carbon potential of carburizing fur-
nace and conversion furnace are calcu-
lated using furnace temperature (fixed
input value) and CO concentration value
(fixed or measured value) while referring
to CO
Calculation equation;
where,
CPS ; Saturated carbon concentration
t
PCO ; CO concentration value (partial
PCO
K1
T
Performance
Within ±0.5% of full scale
• Repeatability:
Within ±2% of full scale
• Linearity:
Within ±1% of full scale/day
• Zero drift:
Within ±1% of full scale/day
• Span drift:
• Response time: 90% response time: Within 50 sec Gal-
2
vanic cell type O2 analyzer: Within 3 min
• Other gases' influence:
Sample
CO
Interfer-
component/
ence compo-
range
200ppm max 500ppm min
nent concentration
Within ±2%
NO
1000ppm
Within ±2%
SO
1000ppm
2
CO
15%
-
2
Within ±2%
CO
1000ppm
Within ±2%
CH
1000ppm
4
Within ±2%
NH
50ppm
3
O 2˚C saturation Within ±3% Within ±2% Within ±3% Within ±2% Within ±2%
H
2
- 83 -
measured value.
2
2
CP= CPS×(PCO)
K1×PCO
2
(partial pressure)
0.0028t–1.30 (800˚C
0.0030t–1.47 (850˚C
0.0034t–1.85 (950˚C
; Furnace temperature
pressure)
; CO
concentration value (partial
2
2
pressure)
(9.06–15966/T)
; Constant K1=10
; Rankine temperature
(t × 9/5+32+460)
analyzer
CO analyzer
O
2
200ppm max 500ppm min
All ranges
Within ±2%
Within ±2%
Within ±2%
Within ±2%
Within ±3% Within ±3%
Within ±2%
-
Within ±2%
-
-
Within ±2%
Within ±2%
Within ±2%
Within ±2%
850˚C)
950˚C)
1000˚C)
CH4 analyzer
analyzer
2
All ranges
Within ±2%
Within ±2%
Within ±5%
Within ±2%
-
Within ±2%
Within ±2%
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