Yokogawa Integral Oxygen Analyzer ZR202 - Manual (Page 89)

<7. Startup>
7-1
IM 11M12A01-02E 8th Edition : Jan.13,2012-00
7. Startup
The following describes the minimum operating requirements — from supplying power to the
converter to analog output confirmation to manual calibration.
System tuning by the HART communicator, refer to IM11M12A01-51E “ HART Communication
Protocol ”.
7.1 Checking Piping and Wiring Connections
Check that the piping and wiring connections have been properly completed in accordance with
Chapter 4, “Piping,” and Chapter 5, “Wiring.”
7.2 Checking Valve Setup
Set up valves and associated components used in the analyzer system as follows:
(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 equals sample gas pressure plus approx. 50 kPa (or sample gas pressure
plus approx. 150 kPa when a check valve is used, maximum pressure rating 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 counterclockwise 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 the Converter
CAUTION
To avoid temperature changes around the sensor, it is recommended that (rather than turning it
on and off) power be continuously supplied to the Oxygen 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 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 measurement mode.
The display panel then displays the oxygen concentration as in Figure 7.2. This is called the
Basic panel display.