General Tools and Instruments DPH230SD - Manual (Page 3)

INTRODUCTION
Thank you for purchasing General Tools & Instruments’ DPH230SD pH Meter with
Datalogging SD Card. Please read this user’s manual carefully and thoroughly before using
the instrument.
The DPH230SD is a general-purpose handheld instrument suitable for measuring the
pH and oxidation-reduction potential (ORP) of a solution. Using optional probes with a BNC
connector, the meter can measure pH from 0 to 14 and ORP from -1999 mV to +1999 mV.
The meter also accepts an optional automatic temperature compensation (ATC) probe that
configures the pH electrode to measure solutions whose temperature is between 32º and
150ºF (0º and 65ºC). For measuring the pH of solutions at temperatures between 32º and
212ºF (0º and 100ºC), the temperature compensation can be set manually. pH electrodes
must be calibrated for pH 4, pH 7 and pH 10 using buffer solutions.
Among the applications and environments suitable for the DPH230SD are water
conditioning, wastewater monitoring, beverage production, aquaculture (fish farming),
aquariums, pulp and paper processing, electroplating, and photography.
The DPH230SD has the performance and features needed to satisfy the most demanding
aspects of the above applications. A front-panel pushbutton enables rapid switching
between the two measurement modes. Measurement accuracies are ± (0.02 pH units
+ 2 digits) for pH readings and ± (0.5% of the reading + 2 digits) for ORP readings.
Because it is microprocessor-based, the DPH230SD can make full use of the portability,
reliability and large storage capacities that SD memory cards offer. Measurements can be
made automatically at any sampling rate between one second and nine hours. After time-
stamping and storing the measurements on an SD card plugged into the instrument (a
process called datalogging), the user can remove the card and plug it into a laptop or
desktop computer either directly or via a USB card reader. The data logs are stored on the
card as files with the .xls extension, which can be opened by Microsoft’s Excel application.
The DPH230SD has a backlit 2-1/2 in. diagonal display and is powered by six “AA” Alkaline
batteries or an optional 9-VDC AC adapter.
KEY FEATURES
• Measures pH and ORP using optional electrodes
• Measured parameter can be changed by pressing front-panel button
• Optional ATC temperature probe automatically calibrates pH electrode to pH 4,
pH and pH 10
• Displays maximum and minimum readings
• Performs real-time automatic datalogging at sampling time settable from 1 second
to 9 hours
• Also supports manual logging and changing of card storage location
• Outputs Excel-compatible data logs
• Accepts SD memory cards of up to 16 GB capacity
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