Accessories – Hanna Instruments HI 21 Series User Manual
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ACCESSORIES
pH CALIBRATION SOLUTIONS
HI 7004M
pH 4.01 buffer solution, 230 mL bottle
HI 7004L
pH 4.01 buffer solution, 500 mL bottle
HI 7004/L
pH 4.01 buffer solution, 1 L bottle
HI 7007M
pH 7.01 buffer solution, 230 mL bottle
HI 7007L
pH 7.01 buffer solution, 500 mL bottle
HI 7007/L
pH 7.01 buffer solution, 1 L bottle
HI 7010M
pH 10.01 buffer solution, 230 mL bottle
HI 7010L
pH 10.01 buffer solution, 500 mL bottle
HI 7010/L
pH 10.01 buffer solution, 1 L bottle
ORP SOLUTIONS
HI 7020M
200-275 mV test solution, 230 mL bottle
HI 7020L
200-275 mV test solution, 500 mL bottle
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
ELECTRODE MAINTENANCE SOLUTIONS
HI 70300M
Storage solution, 230 mL bottle
HI 70300L
Storage solution, 500 mL bottle
HI 7061M
General cleaning solution, 230 mL bottle
HI 7061L
General cleaning solution, 500 mL bottle
HI 7073M
Protein cleaning solution, 230 mL bottle
HI 7073L
Protein cleaning solution, 500 mL bottle
HI 7074M
Inorganic cleaning solution, 230 mL bottle
HI 7074L
Inorganic cleaning solution, 500 mL bottle
HI 7077M
Oil & Fat cleaning solution, 230 mL bottle
HI 7077L
Oil & Fat cleaning solution, 500 mL bottle
HI 7071
3.5M KCl+AgCl electrolyte solution, 4x50 mL bottle, for single
junction electrodes
HI 7072
1M KNO
3
electrolyte solution, 4x50 mL bottle
HI 7082
3.5M KCl electrolyte solution, 4x50 mL bottle, for double junc-
tion electrodes
pH
mV
pH
mV
pH
mV
pH
mV
pH
mV
0
990
1
920
2
860
3
800
4
740
5
680
6
640
7
580
8
520
9
460
10
400
11
340
12
280
13
220
14
160
Reducing pretreatment: immerse the electrode for a few min-
utes in HI 7091.
Oxidizing pretreatment: immerse the electrode for a few min-
utes in HI 7092.
If the pretreatment is not performed, the electrode will take
significantly longer to respond.
As with pH electrodes, gel-filled redox electrodes are more
suitable for industrial applications due to lesser mainte-
nance requirements. However, if working with refillable
electrodes, the electrolyte level should not fall more than
2½ cm (1") below the fill hole and topped up if necessary.
Use HI 7071 refill solution for single junction and HI 7082
for double junction electrodes.
In the event that measurements are performed with solutions
containing sulfides or proteins, the cleaning of the diaphragm
of the reference electrode must be performed more often to
maintain the proper functioning of the ORP electrode. There-
fore, immerse it into HI 7020 and measure the response; the
obtained value should be within 200 and 275 mV.
After this functional test, it is suggested to wash the electrode
thoroughly with water and proceed to the oxidizing or reduc-
ing pretreatment before taking measurements.
When not in use, the electrode tip should be kept moist and
far from any type of mechanical stress which might cause
damage. This can be achieved by installing the electrode in
such a way that it is constantly in a well filled with the sample
(stream or tank). When not in use, store the electrode with a
few drops of HI 70300 storage solution in the protective
cap.
Note
With industrial applications, it is always recommended to
keep at least one spare electrode handy. When anomalies
are not resolved with a simple maintenance, change the elec-
trode to see if the problem is alleviated.