DPH230SD - General Tools And Instruments
Contents
1. Manual temperature compensation e Auto power off e Sampling time of 2 seconds To change any of these parameters use the specific procedure for it detailed in the Setup section 2 To measure the pH of a solution press the W 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 If the ATC probe is not being used perform the last step of procedure to manually match the compensation temperature to the temperature of the solution being tested Holding the pH electrode by its handle immerse it in the solution under test If you are using the ATC temperature probe immerse its head in the solution as well Gently shake the electrode and probe if used to help any air bubbles escape and to ensure an accurate reading The display will simultaneously show the solution s pH in the center and either the manually selected compensation temperature or the actual temperature of the solution as measured by the ATC probe below it By default the temperature reading will be in C unless F has been selected 3 To measure the ORP of a solution press the W button until the display shows the term mV Plug an optional ORP electrode with a BNC connector into the same socket on the top of the me2. log data manually set the sampling time to zero using Step 5 of the setup procedure Then press the REC ENTER button once The display will show the term REC on the top line a value in the middle and below it the letter P on the left and a number from 1 to 99 on the same line to the right The number indicates the position on the SD card that will be used to store manually logged data Now press the LOGGER SET button This will cause the beeper to sound and the term LOGGER to briefly appear at the upper right of the display As in automatic datalogging mode in this mode the instrument is storing measurements and their time stamps on the SD card In manual datalogging mode however measurements are being stored continuously with a sampling time of zero and their locations on the card can be changed 5 To change the storage location of manually logged data press the W button once this causes the P to disappear from the left side of the display and the value on its line to begin flashing Once the flashing begins you can use the W and A buttons to change the flashing value to any number between 1 and 99 Once you have chosen the storage location press the REC ENTER button to save the setting This causes the value to stop flashing and the P to return 6 To end manual datalogging press the REC ENTER button and hold it for at least three seconds This action causes the REC message to disappear from the t
3. switch the display to the minimum value stored during the last session 3 To exit recording mode press and hold the REC ENTER button for at least three seconds until the term REC disappears from the top line of the display The display will then revert to showing the current reading 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 Pressing the LOGGER SET button at this point will make REC flash and add the flashing term LOGGER at the top right of the display This indicates that the instrument is currently storing measured values and their time stamps in memory 2 To pause automatic datalogging press the LOGGER SET button once this action makes the flashing term LOGGER disappear from the top right of the display and changes the term REC from flashing to constant Pressing the LOGGER SET button again resumes automatic datalogging 3 To end automatic datalogging press the REC ENTER button and hold it for at least two seconds This action causes the REC message to disappear 4 To
4. the settings 5 Set the datalogging sampling time Once the date and time have been set and stored the display will show a value below the letters SP t Press the W or A button to decrease or increase the flashing hour value until the desired number appears below SP t Press the REC ENTER button to store that setting The minutes value will then flash Press the W or A button to decrease or increase the value and then press the REC ENTER button to store that setting Finally press the V or A button to decrease or increase the flashing seconds value and then press the REC ENTER button to store that setting 6 Enable or disable auto power off Once the sampling time has been set and stored the display will show the word yES over the term PoFF Press the W button until the desired automatic power off management scheme yES for enable no for disable is displayed Press the REC ENTER button to store the selection If enabled the power off function shuts off the DPH230SD after a period of inactivity of ten minutes 7 Enable or disable the beeper Once the auto power off function has been enabled or disabled the display will show the word yES over the word bEEP Press the Y button until the desired setting yES or no is displayed and then press the REC ENTER button to store the selection 8 Choose a decimal point or comma to represent the decimal division between integers and fractio
5. unit compensation temperature Operating temperature Operating relative humidity Power source 32 to 122 F 0 to 50 C 0 to 85 6 Alkaline AA batteries or optional 9 VDC AC adapter Power consumption Dimensions Weight 14 mADC normal operation with backlight off and SD card not saving data 37 mADC with backlight on and card saving data 49 mADC with backlight on and card saving data 6 97 x 2 68 x 1 77 in 177 x 68 x 45mm 1 08 Ib 489g MAINTENANCE amp 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 _X_ 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 Replacing the batteries requires removing the two screws that hold the battery compartment cover in place as explained in Step 1 of the setup procedure on page 5 After inserting fresh batteries in the correct orientation tighten the screws to secure the cover If the meter freezes like a computer and buttons become unresponsive try resetting the instrument by pushing the RESET button on its right side callout 1 15 of Fig 1 with the end of a pa
6. 4 7 Degre C 2 ZUUWBL2 13 16 38 24 7 Degree t 3 2009 8 12 13 16 40 24 7 Degree_C 4 2009 8 12 13 16 42 24 7 Degree_C 3 uuyrsre 13 16 44 24 1 Degree 6 2009 8 12 13 16 46 24 7 Degree C 7 2009 8 12 13 16 48 24 7 Degree_C 8 2009 8 12 13 16 50 24 7 Degree C 9 FORT 13 16 57 747 Degree C 10 2009 8 12 13 16 54 24 7 Degree C 11 2009 8 12 13 16 56 24 7 Degree_C 19 009819 13 16 SR 747 Degree_C Fig 5 Typical Excel mixed data graphics screen SPECIFICATIONS Embedded microcontroller Custom one chip LSI device Display type Liquid crystal with green backlight Display size Parameters measured Measurement range 2 05 x 1 5 in 52 x 38mm pH ORP 0 to 14 for pH 1999 mV to 1999 mV for ORP Measurement accuracy Measurement resolution Temperature compensation 0 02 pH units 2 digits for pH 0 5 of reading 2 digits for ORP 0 01 unit for pH 1 mV for ORP Automatic between 32 and 150 F 0 and 65 C when using optional ATC temperature probe manually settable between 32 and 212 F 0 and 100 C without ATC probe Storable recallable readings Maximum minimum Datalogging sampling time SD card capacity Settable between 1 second and 8 hours 59 minutes 59 seconds in automatic datalogging mode 1 GB to 16 GB Settable parameters Date time auto power off beep sound sampling time decimal point or comma decimal division temperature
7. C button or the LOGGER SET button to exit the setup procedure and enter normal operating mode CALIBRATING THE pH ELECTRODE N Fig 2 The optional pH electrode you are using must be calibrated before making pH measurements with it for the first time The electrode also should be calibrated whenever you wish to maximize the a es accuracy of measurements Calibration is necessary because not every pH electrode is an ideal electrode that generates 0 mV at pH 7 and 177 4 mV at pH 4 1 To calibrate the pH electrode perform the following procedure while referring to Figure 2 2 Calibrating a pH electrode using the buffer solution 2 1 Electrode plug 2 3 U 2 2 Electrode handle py 2 3 Electrode head 2 4 pH buffer solution 2 4 1 Insert the plug of the pH electrode into the BNC socket at the top of the meter callout 1 14 of Fig 1 2 Power on the meter by pressing the POWER button 3 Using the procedure detailed earlier manually adjust the compensation temperature so it matches the temperature of the buffer solution Alternatively use an ATC temperature probe to make the adjustment automatically 4 Holding it by its handle immerse the pH electrode in the bottle of buffer solution If you are using the ATC temperature probe immerse its head in the bottle as well 5 Gently shake the electrode and the probe if used The display will show the pH value PH 6 Use two fingers to press the REC ENTER and HOLD ESC butto
8. GENERAL DPH230SD USER S MANUAL imping 80 Card Date Logger check pH METER orp GENERAL Mon pH METER WITH DATALOGGING SD CARD Please read this manual carefully and thoroughly before using this product TABLE OF CONTENTS INTFOCUCNON oxcsGe cee eee ee eee eee ks 3 Key FeatureS 0ccc cee en cece eeneaeee 3 4 Operating Instructions 00ee0eee 4 12 What s in the Case 000eeees 4 5 SOUID E eee ee eeteee eee ees 5 7 Calibrating the pH Electrode 7 8 Normal Operation 00c0eeeeees 8 9 Holding and Storing Measurements 9 Automatic vs Manual Datalogging 10 Transferring Data from an SD Card to a Computer 11 12 Specifications aie ee eee ee ee ee 13 Maintenance amp Troubleshooting Tips 14 Optional AccessorieS 0eceeeeeeeaes 14 Warranty Information 00cceeeeaes 15 Return for Repair Policy 0000eeees 15 INTRODUCTION Thank you for purchasing General Tools amp 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 tempera
9. e 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 e Measures pH and ORP using optional electrodes e Measured parameter can be changed by pressing front panel button e Optional ATC temperature probe automatically calibrates pH electrode to pH 4 pH and pH 10 e Displays maximum and minimum readings e Performs real time automatic datalogging at sampling time settable from 1 second to 9 hours e Also supports manual logging and changing of card storage location e Outputs Excel compatible data logs e Accepts SD memory cards of up to 16 GB capacity e Big 2 5 in diagonal front panel green backlit LCD is easy to read e Auto power off function e 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 Optional accessories available from General Tools amp Instruments include pH electrodes a probe that enables automatic temperature compensation ATC of pH electrodes an ORP electrode pH 4 and pH 7 buffer solutions and a 9VDC adapter for a 110V power supply See the Optional Accessories section of this manual for more details Figure 1 shows all of the controls and indicators on the front back top botto
10. m and right side of the DPH230SD Familiarize yourself with the positions and functions of these controls indicators and connectors before moving on to the setup procedure TOP ro 1 14 1 13 1 3 1 4 1 6 1 8 1 18 Fig 1 The DPH230SD s controls and indicators and other physical features 4 1 1 Liquid crystal display 1 10 Battery compartment cover 1 2 POWER button 1 11 Battery compartment cover screws 1 3 HOLD ESC button 1 12 Tripod attachment nut 1 4 REC ENTER button 1 13 Socket for ATC temperature probe 1 5 A button 1 14 Socket for pH electrode 1 6 Y button 1 15 Socket for 9VDC AC adapter 1 7 TIME button 1 16 Reset button 1 8 LOGGER SET button 1 17 RS232 output jack 1 9 Kickstand 1 18 SD card socket SETUP 1 Choose the power source Before using the DPH230SD be sure it is powered by fresh batteries or an optional 9VDC AC adapter plugged into the bottom jack on its right side callout 1 15 To remove the battery compartment cover remove the two screws holding it in place callout 1 11 Then install six AA batteries in the correct orientation using the polarity marks on the inside of the compartment as a guide Replace the cover by replacing the two screws 2 Install an SD card To prepare for setup also install the supplied 2 GB SD memory card or another card with a capacity from 1 GB to 16 GB in the socket on the bottom of the DPH230SD callout 1 18 When installing the card make sure its gold c
11. ns for example American style 20 88 vs European style 20 88 Once the beeper has been enabled or disabled the display will show the word bASIC above the phrase dEC Press the W button to make bASIC American style or Euro appear in the upper display as desired Press the REC ENTER button to store the selection 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 Vv or A 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 The default value is 77 F 25 C The value is adjustable between 32 and 212 F 0 and 100 C Once the display temperature unit has been set and stored the lower portion of the display will show the term t SEt Press either the W or A button until the value above t SEt matches the desired compensation temperature in C or F Press the REC ENTER button to store the setting The display will then either return to the first of the eight steps in the setup sequence choosing whether or not to format the SD memory card or show the term ESC If ESC appears press either the HOLD ES
12. ns at the same time When this screen appears release the buttons 7 Press the V or A button until this screen appears Press the REC ENTER CAL iii button to calibrate the electrode for pH 7 400 8 Press the Y or A button again until this screen appears Press the CAL i REC ENTER button to calibrate the electrode for pH 4 9 Press the V or A button again until this screen appears Press the 10 00 REC ENTER button to calibrate the electrode for pH 10 10 The pH electrode has now been calibrated once To maximize measurement accuracy General recommends rinsing the head of the electrode and the head of the ATC temperature probe if used in distilled water and then repeating the above steps at least twice more 11 To recalibrate the electrode in the future you must clear the existing CLr settings To do so press the W or A button until this screen appears Then CAL press the REC ENTER button to clear the saved settings before repeating the steps above to calibrate the electrode for pH 7 pH 4 and pH 10 NORMAL OPERATION The DPH230SD can measure either the pH or the oxidation reduction potential ORP of a solution 1 To select the type of measurement press the W button which has the word Function stenciled above it until the display shows either the term pH or mV the unit of ORP measurements Following are the default states for the DPH230SD e pH measurement e Temperature unit of C e
13. ontacts are facing front and push the card into the socket until you hear a click To remove the card push it in until you hear a click and the card pops out Now power on the instrument by pressing the POWER button callout 1 2 to generate a short beep To power off the DPH230SD press the POWER button and hold it until the instrument responds with a long beep When the meter powers on a series of transient startup screens will briefly appear Once the display has stabilized perform the following eight setup steps in the order presented 3 Format the SD card LOGGER SET button callout 1 8 and hold it for at least five seconds until Sd F appears in the lower half of the display Quickly within three seconds press the REC ENTER button If you press buttons too slowly in setup mode the screen will revert to the normal display To return to the setup sequence press and hold the LOGGER SET button again To move ahead to the next field in the sequence or to the next parameter press the HOLD ESC button Pressing the REC ENTER button causes the word no or yES to appear over the term Sd F Press the W button to make a selection Choose yES whenever a new SD card is being used or when a used card is being repurposed from use with another SD card instrument or a camera for example and all data on it is to be erased Choose no to preserve any data on a card previously used with this instrument If y
14. op line of the display 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 Re ee ae p F C Peszen ae Te Ch Vase Col _Unir Ch valus Che omit 2 L cog 13 12 36 Tyl uS 94 7 Degree C 3 2 Org 13 14 38 Tyt uS 34 7 Dems C 3 20882 13 12 40 Ti uS 4 7 Dears C S d CORBA 13 l d T4 uS 34 7 Dears C So MOWER 13 J dd Tad uS 4 7 Deprese C A 8 Toeg 13 16 46 TIY uS 94 7 Dears C TO Org 13 14 48 Tad uS 34 7 Dears C q 8 TORA 13 14 90 Tad uS 94 7 Dears C E 9 ZORBA 13 12 52 yy uS 94 7 Dears C 10 ON 13 16 44 aye uS 94 7 Deame_ n lL 208A 13 12 56 TE uS 24 7 Dears C R 12 MOWRZ 13 12 58 axe uS 24 7 Deares_ Fig 3 Typical Excel data only screen 12 73 6 13S 73 4 73 3 73 2 TS 73 729 l 2 2 FE Fig 4 Typical Excel graphics only screen 9 K 1 A jon Date Time Chl Value Ch Value Ch unit 1 2009 8 12 13 16 36 2
15. ou 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 Once the SD card has been formatted or not the meter will automatically move to the next step in the startup sequence setting the current date and time When the word dAtE appears in the center of the display along with the flashing value 00 00 00 at the lower left above yy mm dd set the current year by pressing the V or A button repeatedly until the correct value appears above yy Press the REC ENTER button to store the setting The next screen that appears will have the value above mm flashing Use the W or A button to navigate to the current month and press the REC ENTER button to store the setting When the next screen flashes the value above dd again use the W or A button to navigate to the current day and press the REC ENTER button to store the setting Once you have set the date the display will prompt you to set the hour minute and second of the current time Again use the or buttons to navigate to the correct values and the REC ENTER button to store
16. per clip Remove the batteries when storing the meter for an extended period of time Do not drop or disassemble the meter or immerse it in water OPTIONAL ACCESSORIES e pH electrodes e ATC temperature probe e pH 4 pH 7 and pH 10 buffer solutions e ORP electrode e 9 VDC adapter for 110VAC power supply WARRANTY INFORMATION General Tools amp 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 This warranty does not apply to damages that General determines to be from an attempted repair by non authorized personnel or misuse alterations normal wear and tear or accidental damage The defective unit must be returned to General Tools amp Instruments or to a General authorized service center freight prepaid and insured Acceptance of the exclusive repair and replacement remedies described herein is a condition of the contract for purchase of this product In no event shall General be liable for any incidental special consequential or punitive damages or for any cost attorneys fees expenses or losses alleged to be a consequence of any damage due to failure of or defect in any product including but not limited to any claims fo
17. r loss of profits RETURN FOR REPAIR POLICY Every effort has been made to provide you with a reliable product of superior quality However in the event your instrument requires repair please contact our Customer Service to obtain an RGA Return Goods Authorization number before forwarding the unit via prepaid freight to the attention of our Service Center at this address General Tools amp Instruments 80 White Street New York NY 10013 212 431 6100 Remember to include a copy of your proof of purchase your return address and your phone number and or e mail address Specialty Tools amp Instruments GENERAL TOOLS amp 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 amp INSTRUMENTS NOTICE WE ARE NOT RESPONSIBLE FOR TYPOGRAPHICAL ERRORS MAN DPH230SD 12 07 10
18. ter callout 1 14 of Fig 1 that accepts the plug of a pH electrode Holding the ORP electrode by its handle immerse it in the solution under test Gently shake the head of the electrode to help any air bubbles escape and to ensure an accurate reading The display will show the ORP of the solution in mV Whenever the DPH230SD is in measurement mode you can turn off the backlight which is on by default by briefly pressing but not holding the POWER ESC button To reactivate the backlight briefly press the button again Whenever the instrument is in measurement mode you also can check the current date and time by briefly pressing the TIME button Doing so causes both values to appear briefly at the lower left of the display HOLDING AND STORING MEASUREMENTS 1 To hold a measured value of pH or ORP press the HOLD ESC button during the measurement Doing so will cause the word HOLD to appear at the top of the display Pressing the HOLD ESC button again releases the hold 2 To record and recall readings press the REC ENTER button while making measurements This will make the term REC appear at the top of the display Pressing the REC ENTER button again briefly will make the term MAX appear to the right of REC and switch the display to the maximum value stored in memory during the last recording session Pressing the REC ENTER button again briefly will make the term MIN appear to the right of REC and
19. ture compensation ATC probe that configures the pH electrode to measure solutions whose temperature is between 32 and 150 F 0 and 65 C For measuring the pH of solutions at temperatures between 32 and 212 F 0 and 100 C 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 th
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