Hanna-instruments HI 2214 Manual de usuario descargar pdf (Pagina 9)

RELATIVE mV MEASUREMENTS

• Press RANGE until “rEL” message and “mV” tag are displayed for

one second. After one second the temperature will be displayed on

the secondary LCD and the “mV” tag will blink.

The reading displayed by the instrument is equal to the difference

between the current mV input value and relative mV offset established in

the relative mV calibration.

TEMPERATURE MEASUREMENTS

Connect the HI 7662

temperature probe to the

appropriate socket and turn the instrument on.

Submerse the temperature

probe

into the sample

and allow the reading on the secondary LCD to stabilize.

H CALIBRATIONH CALIBRATION

H CALIBRATION

Calibrate the instrument frequently, especially if high accuracy is

required.

The instrument should be recalibrated:

• Whenever the pH electrode is replaced.

• At least once a week.

• After testing aggressive chemicals.

• If “CAL” “INTV” tags are blinking during measurement.

Every time you calibrate the instrument use fresh buffers and perform an

electrode Cleaning Procedure (see page 38).

PREPARATION

Pour small quantities of the buffer solutions into clean beakers. If

possible, use plastic or glass beakers to minimize any EMC interferences.

For accurate calibration and to minimize cross-contamination, use two

beakers for each buffer solution. One for rinsing the electrode and one for

calibration.

If you are measuring in the acidic range, use pH 7.01 or 6.86 as first

buffer and pH 4.01 as second buffer. If you are measuring in the alkaline

range, use pH 7.01 or 6.86 as first buffer and pH 10.01 or 9.18 as

second buffer.

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Hanna-instruments HI 2214 Manual de usuario Pagina 9