9
pppppH CALIBRATION
H CALIBRATION
H CALIBRATION
H CALIBRATION
H CALIBRATION
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.
20
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