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DPH230SD

USER’S MANUAL

pH METER WITH DATALOGGING SD CARD

Please read this manual carefully and thoroughly before using this product.

Summary of content (16 pages)

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DPH230SD USER’S MANUAL pH METER WITH DATALOGGING SD CARD Please read this manual carefully and thoroughly before using this product.
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TABLE OF CONTENTS Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Key Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 – 4 Operating Instructions . . . . . . . . . . . . . . . . . . . . . 4 – 12 What’s in the Case . . . . . . . . . . . . . . . . . . . . 4 – 5 Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 – 7 Calibrating the pH Electrode . . . . . . . . . . . . . 7 – 8 Normal Operation . . . . . . . . . . . . . . . . . . . . .
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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.
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• Big (2.5 in. diagonal) front-panel green backlit LCD is easy to read • Auto power off function • Powered by six “AA” batteries or optional 9V AC/DC adapter OPERATING INSTRUCTIONS WHAT’S IN THE CASE The DPH230SD comes fully assembled in a carrying case along with a 2 GB SD memory card and this user’s manual.
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1-1 Liquid-crystal display 1-2 POWER button 1-3 HOLD/ESC button 1-4 REC/ENTER button 1-5 ▲ button 1-6 ▼ button 1-7 TIME button 1-8 LOGGER SET button 1-9 Kickstand 1-10 Battery compartment cover 1-11 Battery compartment cover screws 1-12 Tripod attachment nut 1-13 Socket for ATC temperature probe 1-14 Socket for pH electrode 1-15 Socket for 9VDC AC adapter 1-16 Reset button 1-17 RS232 output jack 1-18 SD card socket SETUP 1. Choose the power source.
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If you choose “yES”, after you press the REC/ENTER button the instrument will prompt you to confirm that decision by displaying the term “Ent” below “yES” and sounding three beeps. To confirm that you want to begin the erasure/formatting procedure, press the REC/ENTER button. “Ent” will then flash several times and the instrument will sound another three beeps to confirm that the SD card has been erased and formatted. 4. Set the date and time.
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9. Select the temperature unit. Once the format of decimal point divisions has been set and stored, the lower portion of the display will show the term “t-CF”. Press either the ▼ or ▲ button to change the letter displayed at the right of the display to “C” (for Celsius units) or “F” (for Fahrenheit units), as desired. Then press the REC/ENTER button to store the selection. 10. Set the compensation temperature for pH electrode measurements when operating without an ATC temperature probe.
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6. Use two fingers to press the REC/ENTER and HOLD/ESC buttons at the same time. When this screen appears, release the buttons. 7. Press the ▼ or ▲ button until this screen appears. Press the REC/ENTER button to calibrate the electrode for pH 7. 8. Press the ▼ or ▲ button again until this screen appears. Press the REC/ENTER button to calibrate the electrode for pH 4. 9. Press the ▼ or ▲ button again until this screen appears. Press the REC/ENTER button to calibrate the electrode for pH 10. 10.
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2. To measure the pH of a solution, press the ▼ button until the display shows the term “pH”. Make sure the pH electrode is seated firmly in the BNC socket (callout 1-14 of Fig. 1) on the top of the meter. If the ATC temperature probe is being used, make sure it is seated firmly in its socket (callout 1-13 of Fig. 1) on the top of the meter as well.
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AUTOMATIC VS. MANUAL DATALOGGING The DPH230SD can automatically log data at a user-selected sampling period from 1 second to 9 hours. To view the sampling time for which the instrument was set up, press the LOGGER SET button (which has the words “Sampling check” stenciled below it) once. To change the sampling time, perform Step 5 of the setup procedure. 1. To start automatic datalogging, press the REC/ENTER button once. The top line of the display will show the term “REC”.
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TRANSFERRING DATA FROM THE SD CARD TO A COMPUTER After automatic or manual datalogging of measurements, remove the SD card from the meter and plug it into your computer either directly (if it has an SD card slot) or through an SD card reader. Because the files containing time-stamped data logs have the file extension .xls, they open in Microsoft’s Excel application. Figures 3, 4 and 5 show three kinds of Excel presentations: a data-only screen, a graphics-only screen, and a mixed data/graphics screen. Fig.
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Fig. 4. Typical Excel graphics-only screen Fig. 5.
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SPECIFICATIONS Embedded microcontroller Custom one-chip LSI device Display type Liquid-crystal with green backlight Display size 2.05 x 1.5 in. (52 x 38mm) Parameters measured pH, ORP Measurement range 0 to 14 for pH; -1999 mV to +1999 mV for ORP Measurement accuracy ± (0.02 pH units + 2 digits) for pH; ± (0.5% of reading + 2 digits) for ORP Measurement resolution 0.
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MAINTENANCE & TROUBLESHOOTING TIPS Keep the pH and ORP electrodes and ATC temperature probe clean and protected from the elements when not in use. When the pH electrode is not being used, General recommends keeping its head inserted in the bottle of pH buffer solution. When the icon appears in the left corner of the display, it’s time to replace the six “AA” batteries that power the instrument (although measurements will remain valid for several hours after the low-battery indicator first appears).
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WARRANTY INFORMATION General Tools & Instruments’ (General’s) DPH230SD pH Meter with Datalogging SD Card is warranted to the original purchaser to be free from defects in material and workmanship. Subject to certain restrictions, General will repair or replace this instrument if, after examination, the company determines it to be defective in material or workmanship for a period of one year.
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GENERAL TOOLS & INSTRUMENTS 80 White Street New York, NY 10013-3567 PHONE (212) 431-6100 FAX (212) 431-6499 TOLL FREE (800) 697-8665 e-mail: sales@generaltools.com www.generaltools.com DPH230SD User’s Manual Specifications subject to change without notice ©2010 GENERAL TOOLS & INSTRUMENTS NOTICE - WE ARE NOT RESPONSIBLE FOR TYPOGRAPHICAL ERRORS.