YOKOGAWA IR400 series, User Manual

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<9.SPECIFICATIONS>
9-5
IM 11G02N01-01E
Average value after O
2
correction and O
2
average value calculation:
The result of O
2
correction or instantaneous O
2
value can be
outputted as an average value in the preset period of time.
Used for averaging is the moving average method in which
sampling is carried out at intervals of 30 seconds.
(Output is updated every 30 seconds. It is the average value in the
determined period of time just before the latest updating.)
Averaging time is settable within 1 to 59 minutes (in increments of 1
minute) or 1 to 4 hours (in increments of 1 hour).
Average value resetting: The above-mentioned output of average value is started from the
initial state by opening the average value resetting input terminals
after short-circuiting for 1.5 seconds or longer.
Output is reset by short-circuiting and restarted by opening
CO concentration peak count alarm: (added only for CO/O
2
measurement)
Alarm output turns on according to the preset concentration and count.
Whenever the instantaneous value of CO exceeds the preset
concentration value, count increments. If the count exceeds the
preset value in one hour, the alarm contacts close.
Communication function: RS-232C (9pins D-sub) , Half-duplex bit serial
Start-stop synchronization, Modbus ™ protocol
Contents : Read/Wright parameters, Read measurement
concentration and instrument status
Remark : When connecting via RS-485 interface,
a RS-232C ← →RS-485 converter should be used.
4. Performance
Repeatability : ±0.5% of full scale
Linearity : ±1% of full scale
Zero drift : ±1% of full scale/week
(±2% of full scale/week; range between 0 to 50 ppm and 0 to 200
ppm) (±2% of full scale/day; smaller than 0 to 50 ppm range)
Span drift : ±2% of full scale/week
(±2% of full scale/day; smaller than 0 to 50 ppm range)
Response time (for 90% FS response) :
Within 60 seconds including replacement time of sampling gas
(when gas flow rate is 0.5 L/min). Gas replacement time depends on
the number of measuring components, and measuring range
effects of interfering gases
When sample gas contains gas components listed below, the measurement accuracy may suffer.
Consult Yokogawa for countermeasures or effect on accuracy.
Analyzer Interference gas Effect
SO
2
analyzer NO
2
50 ppm of NO
2
is equivalent to -6 ppm of SO
2
CO analyzer
CO
2
15% of CO
2
is equivalent to 7 to 10 ppm of CO
N
2
O 1000 ppm of N
2
O is equivalent to 80 ppm of CO
CH
4
analyzer CO
2
15% of CO
2
is equivalent to approx. 3 ppm of CH
4