Envco – Environmental Equipment

HI 222 is the only pH meter on the market today that allows for automatic pH calibration at pH 3 and pH 7. With pH 3.00 buffer, any error due to calibration will be minimized.

RECOGNISING DIRTY pH ELECTRODES
Most pH measurements in the process of making wine are made in the must. Tannins and other compounds in the complex mixture have an affinity for and adhere strongly to the electrode surface. Thus, a pH electrode will dirty very rapidly in the must solution; the result of sediments depositing on the sensitive pH bulb and on the electrode junction.

This becomes a big problem while measuring pH and further if the electrode is not properly cleaned. A dirty electrode may give readings that are off by as much as 0.5 pH points, even directly after calibrating!

KNOWING WHEN TO CLEAN pH ELECTRODES
Conventional pH meters do not warn the user when the pH electrode is dirty. A common example of this occurs when, just after calibrating the instrument, the pH electrode is immersed onto pH 7 buffer, and the reading is lower than expected (e.g. pH 6.8 or 6.9 instead of 7.0). HI 222 uses HANNA®' signature Calibration Check™ technology to detect when the electrode is dirty and give warning during calibration.

CLEANING pH ELECTRODES
It is of the utmost importance to properly clean the pH electrode prior to use. The appropriate solution is necessary to remove the particular deposits that coat both the surface of the pH bulb and reference junction when exposed to a must solution. HI 70635 (wine deposit removal) and HI 70636 (wine stain removal) are tailor-made cleaning solutions for wine making.

SPECIFICATIONS
Range pH / -2.00 to 16.00 pH
Range mV / ±699.9 mV; ±2000 mV
Range Temperature / -20.0 to 120.0°C
Resolution pH / 0.01 pH
Resolution mV / 0.1 (±699.9 mV); 1 (±2000 mV)
Resolution Temperature / 0.1°C
Accuracy pH / ±0.01 pH
Accuracy mV / ±0.2 (±699.9 mV); ±1 (±2000 mV)
Accuracy Temperature / ±0.5°C
pH Calibration automatic, 1 or 2 point with 7 memorized buffer values (pH 1.68, 3.00, 6.86, 7.01, 9.18, 10.01, 12.45)
Temperature Compensation / manual or automatic, -20.0 to -120.0°C (-4 to 248°F)
pH Electrode / HI 1048P glass body, BNC + pin (included)
Temperature Probe / HI 7669/2W with 1 m (3.3') cable (included)
PC Connection / RS232 opto-isolated serial port
Data Logging / 100 samples
Input Impedance / 1012 Ohm
Power Supply / 12 Vdc adapter (included)
Environment / 0 to 50°C (32 to 122°F); RH max 95%
Dimensions / 240 x 182 x 74 mm (9.4 x 7.2 x 2.9")
Weight / 1.1 kg (2.4 lb.)

ORDER INFO
HI 222 is supplied with HI 1048P pH electrode, HI 7669/2W stainless steel temperature probe, HI 76404 electrode holder, pH 3 and pH 7 buffer sachets, cleaning solutions for removing wine stains and wine deposits, electrode refilling solution, 5 mL graduated syringe, 12 Vdc power adaptor and instructions.