Yokogawa Integral Oxygen Analyzer ZR202 - Manual (Page 67)

<7. Startup>
7-2
IM 11M12A01-04E
7.1 Checking Piping and Wiring Connections
Refer to Chapters 4 and 5, earlier in this manual, for piping and wiring confirmations.
7.2 Valve Setup
Set up valves and associated components used in the analyzer system in the following procedures:
(1) If a stop valve is used in the detector’s calibration gas inlet, fully close this valve.
(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 7.1, 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 7.2. This is called the basic panel display.
%
Figure 7.1 Display of Sensor Temperature Figure 7.2 Measurement Mode Display
While Warming Up