Microphone User Manual

IMPORTANT

The instrument's pH range should be re-calibrated:

• When the meter is new.

• Whenever the pH electrode is replaced.

• At least once a month.

• After use in aggressive chemicals.

• After cleaning procedure and changing the reference electrolyte.

• For greatest accuracy.

INITIAL PREPARATION

Pour small quantities (up to 4cm / 1½" level)

of pH 7.01 (HI7007 or HI8007) and pH4.01

(HI7004 or HI8004) or pH 10.01 (HI7010

or HI8010) solution into clean beakers. If

possible use plastic beakers to minimize any

EMC interferences.

If you are measuring in the acid range use pH4.01 as second buffer

or pH 10.01 if you are measuring in the alkaline range.

Note: with HI8417 HI7006/HI8006 (pH 6.86) and HI7009/HI8009

(pH 9.18) can be used in place of HI7007/HI8007 (pH 7.01)

and HI7010/HI8010 (pH 10.01) respectively.

For accurate calibration, use two bea-

kers for each buffer solution; the first

for rinsing the electrode, the second

for calibration. In this way, contami-

nation of the buffer is minimized.

Note: the electrode should be submerged approxi-

mately 4 cm (1½") into the solution. If the

temperature probe is used, it should be posi-

tioned as close to the pH electrode as possible.

PH CALIBRATION FOR HI8417

HI8417 provides 6 pre-programmed calibration buffers: three NBS

buffers (d1, d2, d3 i.e. pH 6.86, 4.01, 9.18 respectively) and three

technical buffers (t1, t2, t3 i.e. pH 7.01, 4.01, 10.01 respectively).

When the ATC probe is not used, make sure the temperature is set

manually to reflect the temperature of the solution (see page 23).

HI 7007

RINSE

HI 7007

CALIBRATION

4 cm

(1½

PH CALIBRATION

HI 7004 HI 7007

I 7