Hanna Instruments HI 255 User Manual
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PRELIMINARY EXAMINATION
Remove the instrument from the packing material and examine it carefully to
make sure that no damage has occurred during shipping. If there is any
damage, notify your Dealer or the nearest Hanna Customer Service Center.
Each instrument is supplied with:
HI 1131B Glass-body Combination pH Electrode with 1 m (3.3') Cable
HI 76310 Conductivity / TDS probe
HI 7662 Temperature Probe
HI 76404 Electrode Holder
pH 4.01 & 7.01 Buffer Solutions (20 mL each)
HI 7071S Electrolyte Solution
12VDC Power Adapter
Instruction Manual
Note: Save all packing material until you are sure that the instrument
functions correctly. All defective items must be returned in the original
packing with the supplied accessories.
The HANNA HI 255 is a logging microprocessor-based pH, ORP, Conductivity
(EC), TDS, NaCl and Temperature bench meter. Relative mV feature is also
provided.
The pH measurements are compensated for temperature effect manually or
automatically with the HI 7662 temperature probe.
pH Calibration is possible in up to three points, using five memorized buffers
(4.01, 6.86, 7.01, 9.18 and 10.01).
The autoranging feature of the EC and TDS ranges automatically sets the
instrument to the scale with the highest possible resolution.
The conductivity measurements are compensated for temperature effect manually
or automatically with the temperature sensor inside the conductivity probe. It is
also possible to disable the temperature compensation and measure the actual
conductivity.
The temperature coefficient is user selectable.
The GLP feature provides a guarantee of data consistency.
An alarm time-out is available to alert the user that too much time elapsed
since last pH calibration.
The instrument can store data in memory at the users request for later
retrieval.
GENERAL DESCRIPTION