Description
HI-2221 Calibration Check pH Bench Meter
pH bench top meter that performs calibration diagnostic checks for both pH electrodes and buffer solutions during calibration. You are able to download test results to a computer.
The Hanna HI-2221 & HI-2223 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.
he 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.
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( Electrode Cleaning Solution General 500ml LABTEK )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.
HI-2221 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
Supplied
- HI-1131B pH electrode and HI-7662 temperature probe
- HI-76404N electrode holder
- Starter pack of buffer and cleaning solutions
- 12 VDC adapter
- Instructions
Specifications
| Range pH | -2.00 to +16.00 pH | |
| mV | ± 699.9 mV; ± 2000 mV | |
| Temperature | -20.0 to 120.0 °C | |
| Resolution pH | 0.01 pH | |
| mV | 0.1 mV (± 699.9 mV); 1 mV (± 2000 mV) | |
| Temperature | 0.1 °C | |
| Accuracy pH | ± 0.01 pH | |
| mV | ± 0.2 mV (± 699.9 mV); ± 1 mV (± 2000 mV) | |
| 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″) | |
| Weight | 1.3 kg (2.9 lb.) |
