9 - 2
Remote output holding:
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allows you to hold the output signal to the last value or
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Range changeover:
You can change between ranges by manually, automati-
cally, or remotely.
Manual: by key operation
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FS of the 1st range, the range automatically
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value goes down below 80% FS of the 1st
range, the range automatically switches from
the 2nd range to the 1st range.
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remote range changeover input terminal dedi-
cated for each component is closed, the 1st
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the 2nd range becomes effective.
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range is used, the terminal is opened.
Auto calibration:
This function requires standard gas cylinders for zero
and span calibration and solenoid valves for opening/
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the analyzer opens and closes the solenoid valve driving
contact periodically at preset cycle.
Auto calibration cycle setting:
1 hour to 99 hours (in increments of 1 hour) or 1 day to
40 days (in increments of 1 day).
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The time during which calibration gas is supplied.
60 seconds to 900 seconds (in increments of 1 second)
Auto calibration remote start:
You can start one-time auto calibration if you open
the auto calibration remote start input terminal for 1.5
seconds or longer and then close it. Calibration gas is
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Auto zero calibration:
This function requires a standard gas cylinder for zero
calibration and a solenoid valve for opening/closing
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analyzer opens and closes the solenoid valve driving
contact periodically at preset cycle. The cycle for the
auto zero calibration and that for the auto calibration
can be different.
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1 hour to 99 hours (in increments of 1 hour) or 1 day
to 40 days (in increments of 1 day).
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The time during which calibration gas is supplied
60 seconds to 900 seconds (in increments of 1 second)
High/low limit alarm:
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or below the lower limit, the analyzer closes the contact
to emit an alarm signal.
Instrument error contact output:
The contact is closed when an analyzer error (error No.
1 or 10) occurs.
Calibration error contact output:
The contact is closed if a calibration error (error No. 4,
5, 6, 7, or 9) occurs.
Auto calibration status contact output:
The contact is closed during auto calibration.
Pump ON/OFF contact output:
The contact is closed during measurement, and opened
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during calibration
Optional Functions
O
2
conversion:
Conversion of measured NO, CO, and SO
2
gas concen-
trations into values at reference O
2
concentration
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C: Sample gas concentration after O
2
conversion
Cs: Measured concentration of sample gas
Os: Measured O
2
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1–20%)
On: Reference O
2
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0–19%)
Average value after O
2
conversion and O
2
average valu
ecalculation:
The analyzer can take measurement every 30 seconds,
and calculate the moving average of:
a) the instantaneous concentrations after O
2
correc-
tion or
b) the instantaneous O
2
concentrations.
You can set the period for averaging in the range of 1–59
min (in one-minute increment) or 1–4 hour (in one-hour
increment).
The analyzer transmits the moving average output every
30 seconds.
Average value resetting:
You can reset the average values by short-circuiting the
average value resetting input terminal for 1.5 seconds
or longer. You can start averaging over by opening it.
CO concentration peak count alarm:
(available option only for CO and O
2
analyzer)
The analyzer counts the number of times that the CO
instantaneous value has reached the concentration limit
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you set, the alarm is triggered.
Communication function:
RS-232C
9-pin D-sub connector
Half-duplex bit serial, Start-stop synchronization
Modbus RTU™ protocol
The communication function allows the analyzer to read
and write parameters, and read measured concentration
values and instrument status.
For connection to RS-485 interface, an RS232C–RS485
converter is required.
Performance
Repeatability:
±0.5% of full scale
±1% of full scale (for ranges below 0–50 ppm)
Linearity:
±1% of full scale
21–On
21–Os
