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
Requesting a Quotation and Ordering Products
131 Thailand Science Park. Innovation Cluster 1 Building,
Klong 1, Klong Luang, Pathumthani 12120 Thailand.
Tel. 02-191-3928 Fax 02-191-3929
For more information please contact 081-847-6768 (Ms. Nareerat) IDLine: @alltestkit
E-mail : info@highents.com