4210 Flow Meter
Section 2 Programming
2-37
Note
It is very important to enter accurate measurements for both
the level in the stream and the dimension(s) of the channel, as
all calculations of flow will be based on these measurements. If
the values entered are incorrect, even by relatively small
amounts, all subsequent flow calculations will also be incor-
rect.
For example, an error of only
1
⁄ 4" for a 3" level and
1
⁄ 4" for a 10"
diameter round pipe can result in a combined error of over
14%!
Errors in level measurement have a greater effect on flow cal-
culations at low liquid levels. Dimensional errors tend to be
more significant at higher levels.
Unless you have reliable information about the size of the
channel, you should measure it.
If you select pH for port to adjust, the following display will
appear. (pH will not appear as an option unless you have selected
it in step 1.) If you want to measure pH and pH does not appear
in this step, you must go back to step 1 and select pH instead of
NOT MEASURED.
You can perform a two- or three-point calibration for pH with the
pH sensor. Select the calibration that best suits your stream’s
profile. If the pH in your stream in generally below 7, you would
probably select pH 4 & 7. If the pH is generally above 7, you
would probably select pH 7 & 10. If your stream’s pH varies a
great deal, for example from 3 to 12, your best choice would be
pH 4, 7, & 10. Then:
The flow meter will direct you to repeat this process with the
other standard buffers (7 and/or 10) to calibrate the pH sensor. If
the probe fails to provide the correct output with any of the
buffer solutions, you will receive the following message:
If you select D. O. for port to adjust, the following display will
appear:
ALTITUDE is just off screen to the right. If you select D.O.
STANDARD for the calibration method, the following display
will appear:
pH CALIBRATION
• pH 4 & 7 • • pH 7 & 10 • • pH 4, 7, & 10 •
RINSE PROBE AND PLACE IN 4.0 pH SOLUTION
PRESS ENTER WHEN STABLE X.XX pH
pH BUFFER/PROBE OUT OF RANGE
PRESS ENTER TO CONTINUE
DISSOLVED OXYGEN CALIBRATION
•D.O. STANDARD••ABS BAROMETRIC PRESSURE•>
D.O. STANDARD
0.00 MG/L
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