Yokogawa Integral Oxygen Analyzer ZR202 - Manual (Page 66)

IM 11M13A01-04E 7-2
7.1 Checking Piping and Wirimg 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 measurement gas pressure plus approx. 50 kPa (plus approx.
150 kPa for with check valve) (300 kPa maximum) 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 measured 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.
F7.1E.EPS
%
F7.2E.EPS
Figure 7.1 Display of Sensor Temperature Figure 7.2 Measurement Mode
While Warming Up Display