Hach-Lange SI792 P, SI792x P, SI792x P-FF, SI792x P-PA User Manual - Manual (Page 39)

Operation—4–20 mA/HART
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Press ENTER to access a menu item. Use the ARROW KEYS to edit
values. Press ENTER to save the settings. If a value is outside of the
acceptable range, “Err” will be displayed and the value will not be
accepted. To exit the menu and return to the measurement mode, press
CONF and then ENTER .
Example: Set the 4 mA current output signal to 3 pH.
1. Press CONF , enter passcode: 1200, ENTER . The display will show
Conf and then out.1MNU.
2. Press ENTER to access the output setup menu. The display will
show o1.UniT.
3. Press ENTER , ENTER to show the 4 mA submenu. The display will
show o1.4mA.
4. Use the UP ARROW and RIGHT ARROW to edit the value to
03.00 pH. Press ENTER to save the value. The display will show
o1.20mA.
5. Press CONF and then ENTER to exit the configuration menu.
5.2.1.1 Output range
The upper and lower end of the pH or ORP measurement range should
correspond to the 4 mA and 20 mA signals. For example, to set a range
of 3–12 pH, set the 4 mA signal to correspond to a pH value of 3 and
the 20 mA signal to correspond to a pH value of 12.
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 signal averaging for noise reduction.
When set to 120 seconds, the current output value will be correspond to
the process signal averaged over the last 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.