Supplying Power To Converter; Operation Of Infrared Switch; Display And Switches - YOKOGAWA ZR402G User Manual

(2) If instrument air is used as the reference gas, adjust the Air set secondary pressure so that
the air pressure of sample gas pressure plus approx. 50 kPa (plus approx. 150 kPa for
with check valve) (300 kPa maximum for the ZA8F, 690 kPa maximum for the ZR20H) is
obtained. Turn the reference gas flow setting valve in the flow setting unit to obtain the flow
of 800 to 1000 ml/min. (Turning the valve shaft counterclockwise increases the rate of flow.
When turning the valve shaft, if the valve has a lock nut, first loosen the lock nut.) After
completing the valve setup, be sure to tighten the lock nut.
NOTE
The calibration gas flow setting will be described later. Fully close the needle valve in the flow
setting unit.
7.3

Supplying Power to Converter

CAUTION
To avoid temperature changes around the sensor, it is recommended that the power be
continuously supplied to the Oxygen Analyzer if it is used in an application where its operations
and suspensions are periodically repeated.
It is also recommended to flow a span gas (instrument air) beforehand.
Supply power to the converter. A display as in Figure 7.2, which indicates the detector's sensor
temperature, then appears. As the heat in the sensor increases, the temperature gradually rises
to 750°C. This takes about 20 minutes after the power is turned on, depending somewhat on
the ambient temperature and the sample gas temperature. After the sensor temperature has
stabilized at 750°C, the converter is in the measurement mode. The display panel then displays
the oxygen concentration as in Figure 7.3. This is called the basic panel display.
Figure 7.2
7.4

Operation of Infrared Switch

7.4.1

Display and Switches

This equipment uses an infrared switch that enables operation with the cover closed. Figure 7.4
shows the infrared switch and the display. Table 7.1 shows the three switch (keys) and functions.
Display of Sensor Temperature
While Warming Up
<7. Startup>
Figure 7.3 Measurement Mode Display
IM 11M12A01-04E
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11th Edition : Jul. 19, 2017-00