Yokogawa Integral Oxygen Analyzer ZR202 - Manual (Page 82)

<7. Startup>
7-17
IM 11M12A01-04E
7.10.2 Manual Calibration
The following describes how to conduct a calibration.
7.10.2.1 Preliminary
Before conducting a manual calibration, be sure that the ZA8F Flow Setting Unit zero gas flow valve
is fully closed. Open the zero gas cylinder pressure regulator so that the secondary pressure will be a
sample gas plus approx. 50 kPa (or sample gas pressure plus approx. 150 kPa when a check valve is
used, maximum pressure rating is 300 kPa).
7.10.2.2 Calibration Implementation
This manual assumes that the instrument air is the same as the reference gas used for the span gas.
Follow the steps below to conduct manual calibration. When using the ZO21S Standard Gas Unit (for
use of the atmospheric air as a span gas), use a hand-held oxygen analyzer to measure the actual
oxygen concentration, and then enter it.
Table 7.13 Conducting Calibration
Switch operation Display Description
> ∧
ENT A 01
Display after the password has been entered.
> ∧
ENT b 1 0
Switch the parameter code to B10.
(The key operations for this procedure are omitted.)
> ∧
ENT CAL
Touch the [ENT] key, and "CAL" will be displayed.
To cancel the above, touch the [>] key and [ENT] key together to return to
the B10 display.
> ∧
ENT
CAL
If you touch the [ENT] key again, "CAL" then flashes.
To cancel the above, touch the [>] key and [ENT] key together, the display
will return to the B10 display.
> ∧
ENT SPAn Y
If you touch the [ENT] key again, "SPAn Y" appears (Y is flashing).
If you omit the span calibration, touch the [>] key, and change "Y" to "N".
If you touch the [ENT] key, the display then jumps to "ZEro Y."
> ∧
ENT 21.00
%
Touch the [ENT] key to display the calibration gas value, in other words,
the span gas concentration set in Section 7.10.1, "Calibration Setup."
To cancel the above, touch the [>] key and [ENT] key together, then the
display returns to "SPAn Y."
> ∧
ENT OPEn
/20.84
If you touch the [ENT] key, "OPEn" and the currently measured value are
displayed alternately. Open the Flow Setting Unit span gas flow valve and
adjust the span gas flow to 600 ± 60 ml/min. To do this, loosen the valve
lock nut and gently turn the valve control (shaft) counterclockwise.
Check the calibration gas flowmeter for confirmation.
If the automatic calibration unit is connected, open the span gas solenoid
valve, and the measured value changes to the span gas value.
When the display becomes stable, proceed to the next step.
To cancel the above, touch the [>] key and [ENT] key together, then the
display returns to "SPAn Y."
> ∧
ENT 20.84
%
If you touch the [ENT] key, all the digits flash. At that point, no calibration is
conducted yet.
The symbol [ ] indicates that the key is being touched. Light characters indicates that the digits are flashing.