Microphone User Manual

Procedure:

• Switch the instrument on after connecting the

pH electrode and the temperature probe.

• Immerse the pH electrode and the ATC probe

into a neutral pH buffer solution (pH 7.01

for technical buffers, or pH 6.86 for NBS

buffers).

Shake briefly and wait 1-2 minutes for thermal

equilibrium.

• Press the CAL key. The symbol "d1" will appear

on the display. For calibration with technical

buffers (pH 7.01), press CAL key again

and "t1" will appear on the display.

(Note: the "pH" symbol will be flashing

throughout the calibration procedure).

• Press the CON key. The buffer value will be

displayed on the right LCD.

• Allow 1-2 minutes for the pH reading to stabi-

lize.

The pH reading will be temperature compensated.

E.g. if the buffer temperature is at 25°C, the right display will

show "pH 7.01". If the buffer temperature is at 20°C, the display

will show "pH 7.03" (see page 23).

If "Err4" appears the calibration solution is wrong.

Repeat the process using fresh buffers.

Note: If you are not using the ATC probe, refer to page 22 to

manually correct for temperature.

• Press the CON key again to accept the buffer value.

The first point calibration is now complete.

• If the pH/mV key is pressed at this point, the cali-

bration process is ended and only the offset of the meter is

calibrated. This is known as one point calibration. For greatest

accuracy, however, it is recommended that a two-point calibra-

tion is performed.

• Rinse the electrode and the temperature probe before immersing

them into pH 4.01/ pH10.01 (or 9.18) calibration buffer, shake

briefly and wait for thermal equilibrium.

°C

CON

CAL

CON