User Guide

During pH measurements the instrument reads a mV value

from the electrode and then converts it into a pH value.

• Connect a HI 931001 or HI 8427 simulator to the BNC

socket.

• Once entered the calibration mode,

move through the menu with  or 

key, select the Volt calibration (the pri-

mary LCD shows “UOLt” message) and

confirm it by pressing the CFM key.

• After confirmation the primary LCD will

show the actual mV value and the sec-

ondary LCD will display the first

calibration point.

• The calibration is performed over two points, 0 mV and

350 mV.

• Set the HI 931001 or HI 8427 simulator to 0 mV.

• When the reading becomes stable, if the measured value

is close to the calibration point the CFM tag starts blink-

ing, otherwise the WRONG indicator will flash.

• In the first case press the CFM key to confirm calibration.

The meter will proceed showing the scrolling message “Press

CFM to confirm the current buffer or right to escape” (to

prevent from confirming the calibration point inadvertently).

• Pressing again CFM the secondary LCD will display the

second calibration point.

• Set the HI 931001 or HI 8427 simulator to 350 mV and

follow the same procedure as for the first point.

• If the measured value is not close to the calibration value,

the meter will remain in the WRONG status until the read-

ing becomes unstable or the calibration mode is exited (by

pressing the CAL key).