Yokogawa Integral Oxygen Analyzer ZR202 - Manual (Page 75)

IM 11M12A01-05E 7-2
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 as follows proce-
dures:
(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 an air pressure of measured gas pressure plus approx. 50 kPa (or measured gas
pressure plus apporox. 150 kPa when a check valve is used, maximum pressure
ration is 300 kPa) is obtained. Turn the reference-gas flow setting valve in the flow
setting unit to obtain a flow of 800 to 1000 ml/min. (Turning the valve shaft counter-
clockwise increases the rate of flow. Before 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 is 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 (rather than
turning it on and off) the power be continuously supplied to the Humidity Analyzer if it
is used in an application where it is used periodically.
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 7508 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 7508 C, the converter is in 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
During Warmup Mode Display