Hach-Lange SI792 D, SI792x D, SI792x D-FF, SI792x D-PA User Manual - Manual (Page 40)

Operation—si792(x) D (4–20 mA/HART)
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5.2.1.1 Output range
The upper and lower end of the dissolved oxygen range should
correspond to the 4 mA and 20 mA signals. For example, to set a range
of 3–10 mg/L O
2
, set the 4 mA signal to a value of 3 mg/L and the
20 mA signal to a value of 10 mg/L O
2
.
5.2.1.2 Time averaging filter
An averaging filter is available to reduce noise in the output signal. The
filter averages readings over a specified time interval. The time interval
can be set from 0 to 120 seconds (default: 0 seconds).
When set to 0 seconds, there is no noise reduction and the signal is the
same before and after the filter. When set to 120 seconds, the signal
after the filter will be averaged over 120 seconds. Increase the time
interval to reduce the noise in the output signal.
Note: The filter acts on the output signal but not on the displayed value.
5.2.1.3 Output signal during errors
When an error condition occurs, a 22 mA output signal can be sent as
a notification (default: off).