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pH meter


Price starts at $425.00

Product Code : HI2211-01

Manufacturer : Hanna Instruments

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HI 221

pH Meters with Calibration Check


A pH electrode that is properly manufactured and kept clean will retain its measuring integrity for quite a long time.

The most common cause for pH measurement inaccuracies is an unclean or improperly cleaned electrode. This is very important to note because, during calibration, the instrument assumes that the electrode is clean and that the standardization curve created during the calibration process will remain a valid reference until the next calibration.

pH meters on the market today will allow an offset of approximately ±60 mV. The deviation from 0 mV is not unusual, in fact it represents the true characteristics of the pH electrode. The deviation from 0 mV becomes a problem if it is the result of calibrating a dirty electrode.

HANNA®' HI 221 & HI 223 compare the characteristics of the pH electrode from one calibration to the next. In case of large variances in the electrode condition that can only be the result of a soiled sensor, these meters alert the user that the electrode needs to be properly cleaned prior to calibration and measuring.


Order Information:
HI 221 is supplied with HI 1131P refillable pH electrode (glass-body, BNC & Pin with 1m cable), HI 7669/2W stainless steel temperature probe, HI 76404 electrode holder, pH 4 and pH 7 buffer sachets, electrode refilling solution, 12 Vdc power adapter and instructions.

  • Specifications
  • Included Reagents
  • Accessories
  • Downloads
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 mV; ±1 mV
Accuracy Temperature ±0.4°C
Calibration Check   status of electrode condition and response time,
status of the buffer solution during calibration
pH Calibration   automatic, up to 5 points with 7 memorized values
(pH 1.68, 4.01, 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 1131P, glass-body, single junction, refillable,
BNC + Pin connector, 1 m (3.3') cable (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.)
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