อุปกรณ์วัด pH (Calibration Check™ pH/ORP/Temperature Benchtop Meter)

HI 2221

Calibration Check™ pH/ORP/Temperature Benchtop 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 standardization curve created during the calibration process will remain a valid reference until the next calibration.

A dirty electrode or wrong calibration approach can contribute to buffer solution contamination. A contaminated buffer solution can present a major problem during calibration due to the fact that it is considered the only reference.

The HI 2221 is a pH benchtop meter featuring 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 it’s 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 that allow for the storage and retrieval of all data regarding pH. With a built-in logging function, measurements are stored in non volatile memory and can be transferred to a PC through the USB port.

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.)

Accessories
Electrodes
HI 1043P  Combination pH Electrode, Refillable w/ Double Junction
BNC Connection + pin
HI 1053P  Combination pH Electrode, Refillable w/ Conical Tip
BNC + pin Connection
HI 1083P  Combination pH Electrode w/ Micro Bulb
BNC + pin Connection
HI 1131P  Refillable, Combination pH Electrode for the Laboratory and Beer Testing
BNC + pin Connection
HI 1332P  pH Electrode for Chemicals, Quality Control, and Field
BNC + Pin Connection
Solutions
HI 5004L  pH 4.01 buffer solution
HI 5007L  pH 7.01 buffer solution
HI 5010L  pH 10.01 buffer solution
HI 7061L  General Purpose Cleaning Solution
1 x 500 mL bottle
HI 70300L  Electrode Storage Solution
1 x 500 mL bottle
Accessories
HI 92000  Windows® Compatible Software
HI 920013  USB Cable
HI 76404N  Electrode Holder for HI 42xx Type Bench Meters
Probes
HI 7662  Stainless Steel Temperature Probe