4220 Flow Meter
Section 2 Programming
2-26
Their use in streams with intermittent flow (such as storm
drainage) is not recommended. Note that the pH probe is a con-
sumable item, and will eventually need replacement in any case.
You must hav e an Isco 674 Rain Gauge (or approved equiv-
alent) connected to the flow meter through the Rain Gauge
Port to sense rainfall. MM = millimeters. The rain gauge is
factory-calibrated. See Section 5 for more information about the
rain gauge. If you are not using a rain gauge, you would select
NOT MEASURED for this step.
pH measurement determines the relative acidity or alkalinity of
a solution. You must have an Isco pH Probe (or approved equiv-
alent) connected to the flow meter through the parameter port to
sense pH. pH measurements range from 0 to 14 pH units, with
solutions below 7 considered acidic and solutions above 7,
alkaline. Pure water has a pH of 7.
These devices require periodic recalibration for accurate sensing
of pH. See Section 5 for more information about the pH probe. If
you are not using a pH probe you would select NOT MEASURED
for this step.
• If you choose NOT MEASURED for pH, no more refer-
ences to pH will appear for the rest of the program.
• If you select pH, you will be unab le to measure D. O. and
references to D.O. will not appear on the rest of the
program.
• If your situation requires the measurement of both
parameters (pH and D.O.) at the same time, or if you
also need to measure conductivity, you should use the
YSI 600 Multi-Parameter Sonde.
If you select NOT MEASURED and press Enter, the following
will appear:
Measurement of dissolved oxygen is conducted in studies of
water quality in lakes and streams. Some dissolved oxygen is
necessary for the survival of aquatic life in these waters. PPM =
parts per million; MG/L = milligrams per liter.
You must have an Isco Dissolved Oxygen Probe (or approved
equivalent) to sense dissolved oxygen. The probe attaches to an
amplifier box, which attaches to the Parameter Port.
Note
The 270 D.O. module is no longer available from Teledyne
Isco.
RAIN GAUGE
• INCHES • • MM • • NOT MEASURED •
pH UNITS OF MEASURE
• pH • • NOT MEASURED •
D. O. UNITS
• MG/L • • PPM • • NOT MEASURED •