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HI 4522 • HI 4521 • HI 4222 • HI 4221

Laboratory Catalog - 9073 Research Grade pH Meters

ISE/pH

with Color Display

Bench Meters

pH Calibration Check™

Proper calibration of both the pH meterand pH electrode system is critical in order to achieve reliable results.
HANNA ’sexclusive Calibration Check™ system includes several features to help users reach that goal. • Each time a pH calibration is performed,the instrument compares the new calibration with the previous one. When this comparison indicates a significant difference, the message alerts the user to either clean the electrode, check the buffer or both. • When measurements are taken too far from the calibration points, the instrument will warn the user with a message on the LCD. • The condition of the pHelectrode after calibration is shown on the display to track aging. • To avoid taking readings with old calibrations, the instrument automatically reminds the user when the calibration has expired.

ISE Incremental Methods

Ion concentration determinations with ISE’s can be made faster and easier using the streamlined Incremental Methods. Incremental methods involve adding astandard to a sample, or sample to a standard. A mV change occurs due to the addition. Historically the user would then use mathematical equations to determine the ion concentration of the sample; but with the HI 4522, HI 4521 and HI 4222, sample concentrations are calculated automatically and then logged into an ISE method report. 200 reports can be saved for future recall. The entire process can be repeated on multiple samples withoutreentering sets of parameters. Incremental Method techniques can reduce errors from variables such as temperature, viscosity, pH or ionic strength. The electrodesremain immersed throughout the process thus reducing measurement time as well as eliminating sample carry over and its associated errors.Known Addition, Known Subtraction, Analyte Addition, and Analyte Subtraction methods are standard method choices provided.

ECUSP Mode

HANNA ’s HI 4522 and HI 4521 can beused to perform all 3 stages of United States Pharmacopeia testing requirements for water quality (USP <645>). The instruments give clear instructions onhow to perform each stage and automatically check that the temperature, conductivity and stability are within USPlimits. Comprehensive results are shown for allstages on a single screen at the end of the test. Up to 200 reports can be saved for future recall.

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LABORATORYPRODUCTSCATALOG

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4 TH EDITION