YOKOGAWA av550g, User Manual

Page: 116 / 213

<8. Detailed Data Setting>
8-7
IM 11M12D01-01E
<Default setting>
Output hold settings are set to defaults in Table 8.2 prior factory shipment or after data initialization.
Table 8.2 Defaults for output hold and preset values
Status Output hold value Preset value
Warmup, Purging 4mA 4mA
(Under) Maintenance Hold last Hold last value 4mA
(Under) Calibration
Hold last value
4mA
Indication Check 4mA
Blow back 4mA
Process Gas Alarm Hold last value 4mA
Error Hold last value 4mA
Averaging Group Invalid 4mA 4mA
8.1.3 Setting Output Smoothing Coefficient (Applies to All Analog Outputs)
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 an output
smoothing coefficient (time constant) of between 0 and 255 seconds to reduce the effect. A single time
constant setting applies to all analog outputs.
<Setting Procedure>
1) From “mA-output setup” on the Commissioning display, select “Output damping” and touch the
Enter key. A numerical data entry display is displayed.
2) To set 30 sec., enter 030 and touch the Enter key.
<Default setting>
Factory default setting is 0 sec. (no smoothing).
8.1.4 Setting Output Mode (Applies to All Analog Outputs)
You can select whether the relationship between the measured oxygen concentration and the analog
output signal be linear or logarithmic. The same setting applies to all analog outputs.
<Setting Procedure>
1) From “mA-output setup” on the Commissioning display, select “Output mode” and touch the
Enter key.
2) A selection window appears, allowing you to select “Linear” or “Log”. Touch the Enter key to
confirm.
<Default setting>
Output mode is set to Linear prior factory shipment or after data initialization.
CAUTION
If you select an output mode of “logarithmic” then regardless of range setting the minimum output
value becomes 0.1% O
2
fixed.