Instruction manual

Instruction Manual CyberScan PC5500/ 5000

The Isopotential point is the millivolts reading for an electrode at

which temperature has no effect on the measurement. pH electrodes

are constructed so that the isopotential point is theoretically zero

millivolts. This is very close to a pH of 7. Most pH electrodes do not

achieve this value precisely. However, they are close enough so that

it is not usually necessary to use an isopotential point other than zero.

The true isopotential point of any given electrode must be determined

experimentally. (See APPENDIX: Determining Isopotential Points

Experimentally, page 151)

To Set Isopotential Point

1. Access the Set Isopotential Point screen from the pH (Ion) Setup

screen. The current isopotential point is displayed on the screen.

2. Touch clear to remove the current mV Value.

3. Use the numeric keypad to enter the desired mV setting for the

new isopotential point.

4. Touch enter to accept this value and return to the pH (Ion) Setup

screen.

Touch exit to return to the pH(Ion) Setup screen, without making

any changes.