Accessories - Hanna Instruments pH 21 Instruction Manual

CLEANING PROCEDURE
General : Soak in HI 7061 General Cleaning Solution for about 30
minutes.
Removal of films, dirt or deposits on the membrane/junction:
Protein : Soak in HI 7073 Protein Cleaning Solution for 15 minutes.
Inorganic : Soak in HI 7074 Inorganic Cleaning Solution for 15
minutes.
Oil / grease : Soak in HI 7077 Oil & Fat Cleaning Solution for 1
minute.
IMPORTANT: After performing any of the cleaning procedures, rinse
the electrode thoroughly with distilled water and soak it in HI70300
Storage Solution for at least 1 hour before taking measurements.
TROUBLESHOOTING
Evaluate the electrode performance based on the following.
• Noise (Readings fluctuate up and down) could be due to:
- Clogged/Dirty Junction: refer to the Cleaning Procedure.
- Loss of shielding due to low electrolyte level: refill with
proper solution.
• Dry Membrane/Junction: soak in HI70300 Storage Solution for
at least 1 hour.
• Drifting: soak the electrode tip in warm HI7082 Solution for one
hour and rinse the tip with distilled water (refill with fresh
electrolyte if necessary).
• Low Slope: refer to the Cleaning Procedure.
• No Slope: - Check the electrode for cracks in glass stem or bulb
(replace the electrode if cracks are found).
- Make sure cable and connections are not dam-
aged nor lying in a pool of water or solution.
• Slow Response/Excessive Drift: soak the tip in HI7061 Solu-
tion for 30 min, rinse thoroughly in distilled water and then
follow the Cleaning Procedure.
• For ORP Electrodes: polish the metal tip with a lightly abrasive
paper while paying attention not to scratch the surface, then
wash it thoroughly with water.
Note: For field applications, it is always recommended to keep a
conditioned spare electrode handy. When anomalies can not
be resolved with a simple maintenance, change the electrode
and recalibrate the meter.
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ACCESSORIES

pH CALIBRATION SOLUTIONS
HI 70004P pH 4.01 buffer solution, 20 mL sachet, 25 pcs
HI 7004M pH 4.01 buffer solution, 230 mL bottle
HI 7004L pH 4.01 buffer solution, 500 mL bottle
HI 8004L pH 4.01 buffer solution, 500 mL FDA bottle
HI 70007P pH 7.01 buffer solution, 20 mL sachet, 25 pcs
HI 7007M pH 7.01 buffer solution, 230 mL bottle
HI 7007L pH 7.01 buffer solution, 500 mL bottle
HI 8007L pH 7.01 buffer solution, 500 mL FDA bottle
HI 70010P pH 10.01 buffer solution, 20 mL sachet, 25 pcs
HI 7010M pH 10.01 buffer solution, 230 mL bottle
HI 7010L pH 10.01 buffer solution, 500 mL bottle
HI 8010L pH 10.01 buffer solution, 500 mL FDA bottle
STORAGE & CLEANING SOLUTIONS
HI 70300M Storage solution, 230 mL bottle
HI 80300M Storage solution, 230 mL FDA bottle
HI 70300L Storage solution, 500 mL bottle
HI 80300L Storage solution, 500 mL FDA bottle
HI 70000P Electrode rinsing solution, 20 mL sachet, 25 pcs
HI 7061M General cleaning solution, 230 mL bottle
HI 8061M General cleaning solution, 230 mL FDA bottle
HI 7061L General cleaning solution, 500 mL bottle
HI 8061L General cleaning solution, 500 mL FDA bottle
HI 7073M Protein cleaning solution, 230 mL bottle
HI 8073M Protein cleaning solution, 230 mL FDA bottle
HI 7073L Protein cleaning solution, 500 mL bottle
HI 8073L Protein cleaning solution, 230 mL FDA 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 8077M Oil & Fat cleaning solution, 230 mL FDA bottle
HI 7077L Oil & Fat cleaning solution, 500 mL bottle
HI 8077L Oil & Fat cleaning solution, 500 mL FDA bottle
REFILLING ELECTROLYTE SOLUTIONS
HI 7071 3.5M KCl + AgCl electrolyte, 4 x 30 mL, for single
junction electrodes
HI 8071 3.5M KCl + AgCl electrolyte, 4 x 30 mL, for single
junction electrodes (FDA approved bottle)
HI 7072 1M KNO electrolyte, 4 x 30 mL
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