Electrical Conductivity

Atlas scientific electrical conductivity (EC) probes come in three different configurations:

• K0.1 (freshwater)
• k1.0 (fresh - brackish)
• k10 (fairly fresh to full salinity)

The following directions will work for all three types, but the type of probe must be specified in Step 4 below.

1. Open the Atlas Scientific EC EZO calibration documentation to follow along
2. Remove the cap of the EC probe and situate the probe so that it is suspended in air
3. Type r (without quotes) into the serial monitor and press enter to prompt the probe to collect a reading. The words Success and 4 values close to zero should appear in the serial monitor.
   
4. Type K,n, with n being the type of probe, and press enter. Examples: K,0.1, K,1.0, K,10
5. Type cal,dry into the serial monitor, and press enter. This calibrates the probe to dry conditions

Single-point calibration

1. Pour calibration solution into a small cup or beaker and place probe into solution so that the electrodes are both underwater. Type r and press enter until the value stabilizes (a few minutes).
2. Refer to the documentation to account for temperature (should be around 20C rather than 25C) and type cal,n with n being the concentration of the calibration solution (accounting for temperature differences from 25C), and press enter.

Two-point calibration

1. Follow steps 6 and 7, but use the syntax cal,low,n and cal,high,n for the low and high calibration solutions (respectively)