Yokogawa Single Channel Oxygen Analyzer System ZR22/ZR402 - Manual (Page 133)

IM 11M12A01-03E 8-21
8. Detailed Data Setting
Use the above equation to find the water vapor in the moist air, and use the theoretical
equation (JIS Z 8806) to obtain the temperature at which that water vapor is equal to the
saturated water vapor pressure.
8.6.3.1Setting Measurement Gas Temperature
There are two ways of entering measurement gas temperatures: one is to measure actual
gas temperature using a two-wire temperature transmitter and the other is to enter the
preset value manually.
Set the measurement gas temperature as follows:
(1) Press the Setup key in the basic panel display to display the Execution/Setup
display.
(2) Select Setup in the Execution/Setup display. The “Commissioning” (Setup)
display then appears.
(3) Select Others in that display and then the Exhaust gas setup shown in Figure 8.18.
(4) Point to the Temperature input mode and press the [Enter] key. Then the display
for selecting either “Preset” or “mA input,” appears. Choose the desired one for
your system requirements.
(5) If you choose the “Preset,” a display for entering numeric data then appears. Enter
the measurement gas temperature (see CAUTION).
(6) If you choose “mA-input,” the Exhaust gas setup display shown in Figure 8.19
appears. Enter temperatures at 4- and 20-mA outputs of the temperature transmitter
from the numeric data entry display (See CAUTION).
(7) If you use measurement gas temperature alarms, choose the “Alarm value of
temperature” and enter an alarm temperature from the numeric data entry display.
CAUTION
• The critical temperature of the saturated water vapor pressure is 374
Њ C. If a gas
temperature exceeding 370
Њ C is entered, no correct calculation will be obtained.
• If an invalid value is set, no correct calculation will be obtained. Be sure to check
allowable temperature ranges of the temperature transmitter you use, and then enter
the value correctly.
Enter
Temperature input mode:
mA-input
᭜ Input temperature value:
3 0 0 Њ C
᭜ Pressure: 1 0 1. 3 3 kPa
Exhaust gas setup
F8.18.EPS
Enter
Temperature input mode:
mA-input
᭜ Temperature at 4mA:
0 Њ C
᭜ Temperature at 20mA:
1 0 0 0
Њ
C
᭜ Alarm value of
temperature: 1 0 0 0 Њ C
᭜ Pressure: 1 0 1 . 3 3 kPa
Exhaust gas setup
F8.19.EPS
Figure 8.18 Exhaust Gas Setup Figure 8.19 Exhaust Gas Setup Display
Display (Preset Entry) (Entering mA-input)