Manual Calibration - YOKOGAWA ZR402G User Manual

7.11.2

Manual Calibration

The following describes how to conduct a calibration.
Preliminary
n
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).
Calibration Implementation
n
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 7.16
Switch operation
> ∧
> ∧
> ∧
> ∧
> ∧
> ∧
> ∧
> ∧
> ∧
Conducting Calibration
Display
A01
ENT
b10
ENT
CAL
ENT
CAL
ENT
SPAn Y
ENT
21.00
ENT
%
OPEn
ENT
/20.84
20.84
ENT
%
ZEro Y
ENT
Display after the password has been entered.
Switch the parameter code to B10.
(The key operations for this procedure are omitted.)
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.
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.
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."
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."
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."
If you touch the [ENT] key, all the digits flash. At that point, no
calibration is conducted yet.
If you touch the [ENT] key again, the flashing stops and "ZEro Y"
appears.
Close the span gas flow valve. Secure the span gas lock nut for
leakage.
If the automatic calibration unit is connected, close the span gas
solenoid valve.
If zero gas calibration is omitted, touch the [>] key to change "Y"
to "N".
Next, if you touch the [ENT] key, the display jumps to "CALEnd."
<7. Startup>
Description
IM 11M12A01-04E 11th Edition : Jul. 19, 2017-00
7-19