Yokogawa Single Channel Oxygen Analyzer System ZR22/ZR402 - Manual (Page 107)

IM 11M13A01-02E 7-8
7.6 Confirmation of Detector Type Setting
Check that the detector in Figure 7.7 is the one for this equipment.
WARNING
• If this converter is to be used in conjunction with the ZO21D*, the power require-
ments are limited to 115 V AC or less, 50 Hz or 60 Hz (it cannot be used with a 125
V or greater, or in the EEC).
• If detector settings are to be changed, first disconnect the wiring connections between
the detector and the converter. Then change detector settings appropriately.
* ZO21D is not a explosionproof equipment.
7.7 Selection of Measurement Gas
Combustion gases contain moisture created by burning hydrogen in the fuel. If this
moisture is removed, the oxygen concentration might be higher than before. You can
select whether the oxygen concentration in a wet gas is to be measured directly, or
compensated for its dry-gas value before use. Select the “Select measure gas: Wet” in
Figure 7.8 to select either wet or dry gas.
7.8 Output Range Setting
This section sets forth analog output range settings. For details, consult Section 8.1,
”Current Output Setting” later in this manual.
᭹ Minimum Current (4 mA) and Maximum Current (20 mA) Settings
To set the minimum and maximum current settings, follow these steps:
(1) Select the Setup from the Execution/Setup display.
(2) From the Commissioning (Setup) display, select “mA-output setup”; the display
shown in Figure 7.9 then appears.
(3) Select “mA-output1” from the “mA-outputs” display. The “mA-output1 range”
display shown in Figure 7.10 then appears.
(4) In the display shown in Figure 7.10, select “Min. oxygen conc.” and press the [Enter]
key to display the numeric-value entry display. Enter the oxygen concentration at a
4-mA output; enter [010] for a ten-percent concentration measurement.
(5) Also in Figure 7.10, select “Max. oxygen conc.” at a 20-mA output. Enter the
appropriate maximum oxygen concentration (at the 20-mA output) in the same
manner as in step 4 above.
(6) Set “mA-output2” in the same manner as in the appropriate steps above.
Both outputs are 4-20mA
mA-output1
᭜ mA-output2
᭜ Set presets
Enter
mA-outputs
F7.9E.EPS
Parameter: Oxygen
Set range
᭜ Min. oxygen conc:
0 %O2
᭜ Max. oxygen conc:
25 %O2
᭜
Output damping: 0 s
᭜ Output mode: Linear Enter
mA-output1 range
F7.10E.EPS
Figure 7.9 Setting “mA-output” Figure 7.10 Setting “mA-output1 range”