Hanna-HI 2221-02 Table Top Ph / Orp / Temperature Meter

Hanna-HI 2221-02 Table Top Ph / Orp / Temperature Meter

A properly manufactured and maintained pH electrode will retain its measuring integrity for a long time. As a result of many factors such as age, poor maintenance or improper handling, any electrode in time will lose its integrity. 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 standardisation curve created during the calibration process will remain a valid reference until the next calibration.

Dirty electrode or incorrect calibration approach can contribute to buffer solution contamination. Contaminated buffer solution is considered a reference only, which may pose a major problem during calibration.

The HI-2221-02 is a pH bench top meter features our exclusive Calibration Check diagnostics for both pH electrodes and buffer solutions during calibration. This instrument compares the characteristics of the pH electrode from one calibration to the next. In the case of large variances in the electrode condition, it alerts the user that the electrode needs to be properly cleaned prior to calibration and measuring.

The second feature is to detect if the calibration buffer solution is contaminated. After calibration, the probe condition is evaluated and an indicator is displayed informing the user of the overall pH electrode status.

This instrument can measure using ORP electrodes (pH channel input), due to its capability to measure mV with a resolution up to 0.1 mV.

This meter also features five point calibration with seven standard buffers, Automatic Temperature Compensation and GLP capabilities allowing for the storage and retrieval of all pH related data. With a built-in diary function, measurements are stored in non-volatile memory and can be transferred to a PC via the USB port.

Key features

  • pH Calibration Check
  • On-screen electrode condition and response time
  • Up to five point calibration with seven standard buffers
  • Diagnostic alerts through icons
  • Automatic Temperature Compensation
  • GLP features
  • Optional PC interface via USB

Ordering Information

  • HI-1131B pH electrode and HI 7662 temperature probe
  • HI-76404N electrode holder
  • Starter pack of buffer and cleaning solutions
  • 12 VDC adapter
  • Instructions


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 mV (± 699.9 mV); 1 mV (± 2000 mV)
Resolution - Temperature 0.1 °C
Accuracy - pH ± 0.01 pH
Accuracy - mV ± 0.2 mV (± 699.9 mV); ± 1 mV (± 2000 mV)
Accuracy - Temperature ± 0.2 °C (excluding probe error)
pH Calibration Up to 5 point calibration, 7 standard buffers available (1.68, 4.01, 6.86, 7.01, 9.18, 10.01, 12.45)
Temperature Compensation Manual or automatic from -20 to 120°C
Temperature Probe HI 1131P glass body, single junction, refillable with BNC connection and 1 m (3.3') Cable HI 7662 stainless steel probe
PC Connection USB
Data Logging 100 points
Dimensions 235 x 222 x 109 mm (9.2 x 8.7 x 4.3 inch)
Weight 1.3 kg (2.9 lb.)