Calibration Procedures; Mode; Calibration Procedure - YOKOGAWA ZR402G User Manual

(3) Response time
You can monitor the response time provided that a two-point calibration has been done in
semi-automatic or automatic calibration.
(4) Cell's internal resistance
The cell's internal resistance gradually increases as the cell (sensor) deteriorates. You can
monitor the values measured during the latest calibration. However, these values include
the cell's internal resistance and other wiring connection resistance. So, the cell's degrading
cannot be estimated from these values only.
When only a span calibration has been made, these values will not be measured, and
previously measured values will remain.
(5) Robustness of a cell
The robustness of a cell is an index for predicting the remaining life of a sensor and is
expressed in a number on four levels.
9.2

Calibration Procedures

NOTE
Calibration should be made under normal operating conditions (if the probe is connected to a
furnace, the analyzer will undergo calibration under the operating conditions of the furnace). To
make a precise calibration, conduct both zero and span calibrations.
The following sets forth the required calibration settings:
9.2.1

Mode

There are three calibration modes available:
(1) Manual calibration which allows zero and span calibrations or either one manually in turn;
(2) Semi-automatic calibration which lets calibration start with the touch panel or a contact
input, and undergoes a series of calibration operations following preset calibration periods
and stabilization time.
(3) Automatic calibration which is carried out automatically following preset calibration periods.
Calibrations are limited by the following mode selection:
• When Manual calibration is selected:
Manual calibration only can be conducted. (This mode does not allow semi-automatic
calibration with a contact input nor automatic calibration even when its start-up time has
reached.)
• When Semi-automatic calibration is selected:
This mode enables manual and semi-automatic calibrations to be conducted.
(The mode, however, does not allow automatic calibration even when its start-up time has
reached.)
• When Automatic calibration is selected:
This calibration can be conducted in any mode.
9.2.2

Calibration Procedure

Select both span and zero calibrations or span calibration only or zero calibration only. Usually
select span and zero calibrations.
<9. Calibration>
IM 11M12A01-04E 11th Edition : Jul. 19, 2017-00
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