User Guide

LAST CALIBRATION DATA

If the instrument is set as pH meter, the following data about

the last calibration are stored in the EEPROM:

• Date

• time

• offset, in mV

• slope, in mV/pH

• up to two buffers.

If the instrument is set as ORP meter, the data stored in the

EEPROM are the following:

• Date

• time

• first calibration point

• second calibration point.

While displaying these data the HI 504910 continues to

acquire and transmit measurements.

To enter the last calibration data mode,

press (ALT+) CAL DATA.

If the meter has never been calibrated

or an EEPROM reset has occurred, no

calibration data is shown when CAL

DATA is pressed. The “no CAL” mes-

sage will blink for a few seconds, then

the meter skips back to the previous

mode.

If the meter is configured to measure pH, once entered the

last calibration data, the following messages could scroll twice

on the primary LCD before showing the calibration date:

• “Old probe”

• “Dead probe”.

Otherwise the last calibration date will

appear on the primary LCD displayed

as DD.MM format, while the second-

ary display will show the last two digit

of the year.

Pressing the  key, the meter will cycle through the following

steps in reverse order, i.e. beginning from last buffer.