Cell Robustness; Cell Temperature; C. J. Temperature - YOKOGAWA ZR22G User Manual

10% of analog
output span
The response time is obtained after the corrected calibration curve has been found. The response time
is calculated, starting at the point corresponding to 10% of the analog output up to the point at 90% of
the analog output span. That is, this response time is a 10 to 90% response.
Figure 10.3
10.1.3

Cell robustness

The robustness of a cell is an index for predicting the remaining life of a sensor and is expressed
as one of four time periods during which the cell may still be used:
(1) more than a year
(2) more than six months
(3) more than three months
(4) less than one month
The above four time periods are tentative and only used for preventive maintenance, not for
warranty of the performance.
This cell's robustness can be found by a total evaluation of data involving the response time, the
cell's internal resistance, and calibration factor. However, if a zero or span calibration was not
made, the response time cannot be measured. In such a case, the response time is not used as
a factor in evaluating the cell's robustness.
10.1.4

Cell Temperature

This displays the cell (sensor) temperature, which is determined from the thermocouple emf and
cold junction temperature. Normally it is 750°C.
10.1.5

C. J. Temperature

This indicates the detector terminal box temperature (except for ZR802G-/CJ selected),
which compensates for the cold junction temperature for a thermocouple measuring the cell
temperature. When the ZR22 Detector is used, the maximum C. J. temperature will be 150°C. If
the terminal box temperature exceeds this, take measures to shield the terminal box from heat
radiation.
The maximum C. J. temperature varies depending on the type of detector.
When ZR80G /CJ is selected, this shows a temperature near terminal box inside a converter
case.
Response time
mA
Start calibration
Typical Response Time characteristic
<10. Other Functions>
Five minutes maximum
Time
100%
90%
Calibration
complete
F10.3E.ai
IM 11M12G01-02EN 1sh Edition : Mar. 25, 2021-00
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