Field Probe

Oakton PCS 35 TESTRs  can measure temperature, pH, conductivity, total dissolved solids (TDS), and salinity.  The probe has has three instruments: a thermometer, a pH meter, and a conductivity meter.  The internal computer can then use temperature and conductivity to calculate TDS and salinity.

All measurements need to occur in flowing water. Make sure that you do not damage the sensors by placing them against the substrate on a lake or stream.   The probes are waterproof and float, but be sure to use the lanyard so they do not get lost.

Steps for using Field Probe

Illustration

Press "ON/OFF" to turn on meter and select "MODE ENT" to select the first parameter that you want to measure.  Remove the cap and store in a safe location.

Hold the tip of the probe completely submerged underwater, but leave the screen visible.

Wait one to two minutes while the value adjusts.  Once the value has settled record the number on your data sheet.

You can press the "HOLD" button to lock in the current value if you need to remove the sensor from the water to write on the datasheet.


           

Pay special attention to the units.  The conductivity, TDS, and salinity can change based on the hardness of the water.  If they do you will need to convert your data before you record it on the database.



After you have measured all parameters rinse the sensors off with clean water.


Place a little bit of tap water or pH 4 buffer in the cap.  Replace the cap and store upright indoors.  Do not leave your field probe in your car where it can be exposed to extreme temperatures.