User Guide

is exited (by pressing the CAL key).

• When performing the second calibration point, it is pos-

sible to choose between two values, 25°C and 50°C. Pressing

the  or  key the value on the secondary LCD will switch

between the two possibilities.

• Once selected the value, immerse the temperature probe

in the second beaker as near as possible to the Checktemp

and the calibration procedure will be the same as for the

first point.

VOLT CALIBRATION

The instrument is factory calibrated; however the user may

also perform the Volt calibration, which is a procedure avail-

able for the meter configured as pH controller only.

During pH measurements the instrument reads a mV value

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

• Set item I.04 to “OFF” to disable the Matching Pin.

• 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

primary LCD shows “UOLt” mes-

sage) and confirm it by pressing the

CFM key.

• After confirmation the primary LCD

will show the actual mV value and

the secondary LCD will display the

first calibration point.

• The calibration is performed over two points, 0 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.