Item to collect:
DC power source (500 to 2000 mV) such as a regulated DC power supply or a standard “C” cell battery (1500 mV)
1. Push MAIN MENU.
2. Select OPTIONS>ADVANCED OPTIONS>CALIBRATION>ORP.
3. With the ORP junction box connected to the ORP port on the instrument, remove the ORP probe from the ORP junction box.
4. Apply a positive DC reference voltage to the ORP probe terminals in the junction box as follows:
a. Connect the positive terminal of the DC power source to the terminal block screw with the label GLASS.
b. Connect the negative terminal of the DC power source to the terminal block screw with the label REF.