GENEQ > Biotechnologie > pH mètres - laboratoire

pH mètre de laboratoire pour la recherche
modèle HI422


pH • pH/ISE • EC • pH/EC
BENCH METERS

HANNA’s new family of research grade laboratory benchtop instruments feature
a 240 x 320 dot-matrix color display with on-screen help, simultaneous
graphing, language selection and custom configuration.
Four models are available to measure pH, pH and ISE, conductivity, pH and conductivity.
HANNA’s pH meters feature a 5 point calibration with a choice of custom or
memorized buffers and provide the user with the exclusive CAL CHECK™ electrode
diagnostic system. ISE models allow direct calibration and measurement with a
choice of units, as well as incremental methods.
Our new conductivity meters have EC, resistivity, TDS and salinity measuring scales.
EC has an extended range from 0.001 ?S/cm to 1 S/cm with auto recognition of
the probe type used. Salinity measurements can be displayed in practical salinity,
natural sea water or in percent scale. All conductivity models feature stages 1, 2
and 3 USP modes plus linear and natural water temperature compensation.
All models are equipped with USB and RS 232 ports for PC connectivity and
offer logging, graphing and GLP.

Features
PH
 • Exclusive Hanna CAL Check™
• Five point calibration with standard and custom buffers
ISE
 • Direct calibration and measurement in multiple units
• Incremental methods :
Known addition
Known subtraction
Analyte addition
Analyte subtraction
EC
 • EC, resistivity, TDS and salinity ranges
• Auto recognition of probe type (2 or 4 ring, and nominal cell constant)
• Extented range from 0.001 µS/cm to 1S/cm
• Stages 1.2 and 3USP mode
• 3 salinity scales:
Practical salinity
Natural sea water
Percent
• Linear and natural water temperature compensation

SPECIFICATIONS
HI 4222
pH/ISE Bench Meter
pH
Range
-2.0 to 20.0; -2.00 to 20.00; -2.000 to 20.000 pH
Resolution
0.1 pH; 0.01 pH; 0.001 pH
Accuracy
±0.1 pH; ±0.01 pH; ±0.002 pH
mV
Range
±2000 mV
Resolution
0.1 mV
Accuracy
±0.2 mV
ISE
Range
1 x 10-7 to 9.99 x 1010 concentration
Resolution
1; 0.1; 0.01 concentration
Accuracy
±0.5% (monovalent ions); ±1%
Temperature
Range
-20.0 to 120°C; -4.0 to 24
48.0°F; 253.15 to 393.15K
Resolution
0.1°C; 0. .1°F; 0.1K
Accuracy
±0.2°C; ±0
0.4°F; ±0.2K
Calibration
pH
Automatic up to 5 points with 8 memorized values (pH 1.68,
3.00, 4.01, 6.86, 7.01, 9.18, 10.01, 12.45) + 5 custom buffers
ISE
Automatic, up to 5 points with 6 standard + 5 custom values
Temperature
3 points
Relative mV Offset Range
±2000 mV
Input Channel(s)
2 pH/mV + 1SE
Calibration Check
pH electrode and buffer condition
Temperature Compensation
pH
Automatic or manual from -20.0 to 120.0°C (-4.0 to 248.0°F)
EC
Automatic or manual from -20.0 to 120.0°C (-4.0 to 248.0°F)
Log-on-demand/ Automatic Data Logging
10 Lots, 5000 samples per lot
Auto Endpoint
Yes
PC Connection
Opto-isolated USB and RS232
Display
240 x 320 dot-matrix color LCD with on-screen help, graphing, language selection and custom configuration
Power
12 VDC adapter (included)
Dimensions/Weight
159 x 230 x 93 mm x 9.1 x 3.7”)/800 g (1.8 lb.)

pH Calibration Check™
Proper calibration of the pH meter and pH electrode system is critical in order to achieve reliable results. HANNA’s exclusive 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 pH electrode 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 ISEs can be made faster and easier using the streamlined Incremental Methods measurement mode found on the HI 4222.
Incremental methods involve adding a standard 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 4222, the meter calculates the sample concentration automatically and then logs it into an ISE methods report. 200 reports can be saved for future recall. The entire process can be repeated on multiple samples without reentering sets of parameters.
Incremental Method techniques can reduce errors from variables such as temperature, viscosity, pH or ionic strength. The electrodes remain 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.