Yokogawa Integral Oxygen Analyzer ZR202 - Manual (Page 108)

<8. Detailed Data Setting>
8-2
IM 11M12A01-02E 8th Edition : Jan.13,2012-00
Setting example 2
If the range minimum (corresponding to 4 mA output) is set to 75 vol%O
2
then range maximum
(corresponding to 20 mA output) must be at least 75x1.3=98 vol%O
2
(rounding decimal part up).
5
15
25
35
45
55
65
75
85
95
5 15 25 35 45 55 65 75
Minimum oxygen concentration, vol%O
2
(for a minimum current of 4 mA)
Minimum-Maximum setting range of oxygen concentration
Maximum oxygen concentration, vol%O
2
(for a maximum current of 20 mA)
Ranges over which oxygen
concentrations can be set
Outside ranges
F8.0E.ai
8.1.3 Setting Output Smoothing Coefficient
When the oxygen concentration in the sample gas fluctuates rapidly, if the measured value is
used for control this can lead to problems with undesirable frequent ON/OFF switching. You can
set a smoothing time constant of between 0 and 255 seconds to reduce the effect. Select the
appropriate output damping constant from the numeric-data entry display. To set 30 seconds,
enter 030.
8.1.4 Selection of Output Mode
You can select whether the relationship between the sample oxygen concentration and the
analog output signal be linear or logarithmic. Press the [Enter] key in the output mode display. A
linear/ logarithmic selection display then appears. Select the desired mode.
NOTE
If you select an output mode of “logarithmic” then regardless of range setting the minimum output
value becomes 0.1 vol%O
2
fixed.
8.1.5 Default Values
When the analyzer is delivered or reset to defaults, the output current default settings by as
shown in Table 8.1.1.
Table 8.1.1 Output Current Default Values
Item Default setting
Min. oxygen concentration 0 vol%O
2
Max. oxygen concentration 25 vol%O
2
Output damping constant 0 (seconds)
Output mode Linear