Hanna-instruments HI 250 Bedienungsanleitung PDF herunterladen (Seite 12)

Note:  If the value measured by the instruments is not close to the

selected buffer, WRONG 

BUF

 and WRONG   tags will

blink alternately. In this case, check if the correct buffer has been

used or regenerate the electrode by following the Cleaning Proce-

dure (see page 30). If necessary, change the buffer or the

electrode.

 If WRONG, Buffer pH tags and Old tag on the secondary LCD

are displayed blinking, an inconsistency between new and previous

(old) calibration is detected. Clear calibration parameters by

pressing SET/CLR and proceed with calibration from the current

calibration point (the instruments will keep all confirmed values

during current calibration).

 The WRONG tag and temperature value are displayed blinking

if temperature reading is out of the defined temperature range of

the buffer. Calibration cannot be confirmed in this situation.

 Press RANGE to display the temperature reading on

the LCD during calibration.

TWO-POINT CALIBRATION

 Proceed as described in Three-point calibration section.

 Press CAL after the second calibration point was confirmed.

The instruments will return to measurement mode and will memorize the

two-point calibration data.

ONE-POINT CALIBRATION

 Proceed as described in Three-point calibration section.

 Press CAL after the first calibration point was confirmed.

The instruments will return to measurement mode and will memorize the

one-point calibration data.

Note: Calibration parameters are evaluated taking in consideration the new

values for the confirmed buffers in current calibration and the old

values, if existing, for the other buffers. To clear old calibration values,

press SET/CLR before exiting calibration.

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Hanna-instruments HI 250 Bedienungsanleitung Seite 12