Rain Gauge Inches MM not Measured

4220 Flow Meter

Section 2 Programming

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.

RAIN GAUGE

• INCHES • • MM • • NOT MEASURED •

You must have 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 UNITS OF MEASURE

• pH • • NOT MEASURED •

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 unable 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:

D. O. UNITS

• MG/L • • PPM • • NOT MEASURED •

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