Hanna Instruments HI8424 User Manual

Page 9

pp H C A L I B R A T I O N

H C A L I B R A T I O N

For better accuracy, frequent calibration of the instrument is recommended.
The instrument should be recalibrated for pH:
a) Whenever the pH electrode or temperature probe is replaced
b) At least once a week
c) After testing aggressive chemicals
d) When extreme accuracy is required

PREPARATION
Pour small quantities of pH 7.01 (

HI 7007) and pH 4.01 (HI 7004) or pH

10.01 (

HI 7010) buffer solutions into two clean beakers.

For accurate calibration use two beakers for each buffer solution, one for rinsing
the electrode tip, and one for calibration. In this way contamination of the
buffers is minimized.
For measurements in acidic samples, it is recommended to calibrate the meter
by using pH 7.01 (

HI 7007) and pH 4.01 (HI 7004) buffers, while for

alkaline measurements use pH 7.01 (

HI 7007) and pH 10.01 (HI 7010)

buffers.

PROCEDURE
• Connect the pH electrode and the temperature probe,

then switch the meter ON.

• Remove the electrode protective cap, rinse the electrode

tip with pH 7.01 solution, then immerse the pH
electrode and temperature probe into pH 7.01 buffer
solution; stir gently and wait a few minutes for the
electrode to stabilize and reach thermal equilibrium.

Note: The electrode should be submerged approximately 4

cm (1½") into the solution. The temperature probe
should be located close to the pH electrode.

• Press RANGE to display pH measurement.
• Press CAL to enter the calibration mode. The buffer value @25°C (77°F) and

the "pH" symbol will blink on the display.

• The meter expects a pH 7.01 buffer.

HI 7082

3.5 M KCl electrolyte solution, 4 x 30 mL bottle, for double
junction electrodes

HI 8082

3.5 M KCl electrolyte solution, 4 x 30 mL FDA bottle, for double
junction electrodes

HI 8093

1 M KCl+AgCl electrolyte solution, 4 x 30 mL FDA bottle, for
double junction electrodes

ORP SOLUTIONS

HI 7091M

Reducing pretreatment solution, 230 mL bottle

HI 7091L

Reducing pretreatment solution, 500 mL bottle

HI 7092M

Oxidizing pretreatment solution, 230 mL bottle

HI 7092L

Oxidizing pretreatment solution, 500 mL bottle

HI 7020M

Test solution @200-275 mV, 230 mL bottle

HI 7020L

Test solution @200-275 mV, 500 mL bottle

HI 7021M

Test solution @240 mV, 230 mL bottle

HI 7021L

Test solution @240 mV, 500 mL bottle

HI 7022M

Test solution @470 mV, 230 mL bottle

HI 7022L

Test solution @470 mV, 500 mL bottle

pH ELECTRODES

HI 1043B / HI 1040S
Glass body, double junction, refillable, combination

pH electrode.

Use: strong acid/alkali.

HI 1053B / HI 1050S
Glass body, triple ceramic, conic shape, refillable, combination

pH electrode.

Use: emulsions.

B = BNC CONNECTION PLUG + 1 m (3.3’) CABLE

S = SCREW-TYPE CONNECTOR

120 mm

4.7"

12 mm

0.5"

9.5mm DIA

0.37"

"S" VERSION

HI 1043

120 mm

4.7"

12 mm

0.5"

"S" VERSION

HI 1053