UltraBasic Benchtop pH Meter - denver instrument

1 UltraBasic Benchtop pH MeterOperation InstrumentMeasuring 44 7 10UB-5pH Rev. A1. Connect a AC adapter tothe power CS 4 7 10 UltraBasicPowerRefInputATC2. Connect an electrode to the Inputand ATC connectors, if Press modeuntil the dis-play indicates the appro-priate measurement mode(pH or mV/relative mV).4. Standardize the meterusing up to three buffersby immersing the elec-trode in a buffer, stirring,then pressing standardizeto enter each Meter Quick Reference5. The display shows the cur-rent reading in pH, mV, orrelative mV Press setupto review elec-trode calibration and to clearor select buffer Of ContentsQuick Reference ..Inside Front CoverGetting StartedFront panel controls ..3 Digital display ..3 Rear panel connectors ..4 Installing and Maintaining Electrodes ..5 Installing electrodes ..5 Storing electrodes ..6 Standardizing for pH Measurement.

2 7 Entering buffers ..7 Using Setup ..10 Clearing Buffers ..10 Reviewing electrode standardization ..10 Selecting buffer sets ..10 Standardizing for Millivolt Measurement(Relative Millivolts) ..12 Entering a millivolt standard ..12 Using Setup in mV Mode ..13 Clearing a millivolt standard ..13 Understanding pH Theory ..14 Defining pH ..14 Understanding Temperature Compensation ..15 Measuring pH ..16 Troubleshooting ..17 Electrode testing ..17 Meter Operation testing ..18 Meter Specifications ..19 Accessories ..19 Technical Assistance .. Back Cover 1 DisclaimersImportant Note:The operator shall be responsible for any modifications to DenverInstrument Company equipment and for any connections of cablesor equipment not supplied by denver instrument and must checkand if necessary, correct these modifications and connections. You have purchased a quality precision Meter that requireshandling with care.

3 Read entire contents of this Operation Manual prior to operating your new denver instrument Meter . Caution: Changes or modifications not expressly approved by the manufac-turer could void the product s in the by:2modeentersetupstandardizepH CS 4 7 S3321%/ CAutoManSetClearOKError1234567810101213 SalTDS%DOmg/LS/cmcm ionrelmV pHm KM CSGetting Started3setup- press toclear buffers,review electrodecalibration orselect new autorecognizedbuffer press totoggle betweenpH or mVmode. (UB-10 only)Digital DisplayStabilityIconTemperatureModeFront Panel ControlsResultElectrodeCheckIconsPrompts BufferIconsenter - pressto to auto-recognizeeach : Not all icons on display will be Panel ConnectorsPowerCableConnectorReference ElectrodeConnector(used with separateReference Electrodes)BNCE lectrodeConnectorATC (AutomaticTemperatureCompensation)ProbeC onnector4 Installing and Maintaining ElectrodesThis Meter allows you to use: Combination pH electrode with BNC connector 3-in-1 combination electrode with BNC connector and mmphone jack for ATC Indicating pH electrode with BNC connector and sperate reference Separate mm phone jack for ATC Ion selective or ORP electrode with BNC Remove the protective end coverfrom electrode.

4 3. Remove the shorting cap on the BNC connector. Install the electrode byplugging it into theinputconnection (push on and twist to lock). Anaccessory ATC probe can be installed in the ATCport for the most accu-rate Before using your pH electrode,or whenever the electrode isdry, soak over-night in anElectrode Filling Solution, KCIsolution or Electrode If a separate reference electrode is used, plug the reference electrodeinto theref Rinse and blot-dry electrodesbetween each measurement (donot wipe). Rinse electrodeswith distilled water or deionizedwater, or part of the next solu-tion to be Store pH electrodes in KCI solu-tion or Electrode StorageSolution. Always leave the fillinghole open when in use andclosed when in storage. Refillwith Filling Solution when theinternal solution level gets 1 below fill : The electrode that comeswith the UltraBasic kit is has no fill solution or filling for pH MeasurementBecause electrodes vary in their response, you must standardize your pHmeter and electrode to compensate for electrode variation.

5 The more fre-quently you standardize, the more accurate your daily, or more often, for accurate :To escape from standardizing mode, press Standardize key Immerse electrode in a buffersolution. Stir gently. Allow theelectrode to reach a stable CS 4 7 10 2. Press and release the mode but-ton until your digital displayindicates pH Clear existing buffers when doinga new standardization. Use thesetupand enterbuttons to clearexisting Press standardize. The meterflashes the current buffer setand recognizes the flashingbuffer. When the signal is stable,or when you press enter, thebuffer is 4 7standardizesetupentermode 2 4 7 10 12pH CSstandardizesetupentermode85. The Meter displays the percentslope of the electrode as the first buffer. On entering asecond or third buffer, themeter performs a diagnosticcheck on the electrode and dis-plays the To enter a second buffer, placethe electrode in the secondbuffer solution, stir, allow timefor the electrode to stabilize,and press standardize Meter recognizes the Next, the Meter performs adiagnostic test of the display indicates electrodecondition.

6 The Meter displaysthe % slope of the Errorindicates that yourelectrode is not working proper-ly. The electrode response mustbe between 90 and 105% causing SlopeError are not accepted, used orstored by the Meter . Press enterto 7pHSstandardizesetupentermode 2 4 7 10 12pH CSstandardizesetupentermodeError 4 7pHstandardizesetupentermodeOK 4 7pHstandardizesetupentermode99. To enter a third standard, placethe electrode in the third buffersolution, stir, allow to stabilize,and press standardize. Theresults will be the same as insteps 7 and After entering each buffer, theStandardizingicon goes off andthe Measuring or Stableiconappears on the display to indi-cate that the Meter returns toMeasuring Standardize your Meter andelectrode using at least twobuffers with pH values bracket-ing the expected pH of yoursamples. Stirring with a mag-netic stir bar and stirrer pro-vides faster electrode : If an ATC probe is used, themeter continually adjusts for tem-perature.

7 Therefore, buffers mayvary slightly from the nominal val-ues because of temperature is 25 oCNote: The temperature is only dis-played when an ATC probe 7 10pHstandardizesetupentermodepH CS 4 7 10 standardizesetupentermode10 Using Setup in pH ModeThe setupbutton lets you clear all the buffers/standards that you haveentered, review calibration information, or select the buffer/standard setthat you want. Note:Continuing to press setupwill return you to measurement Press setupand the Meter dis-plays a flashing Clear icon. Usethis step only when you wish toclear all buffers you haveentered. To clear all existingbuffers, press enter. The meterclears all buffers and returns toMeasuring Press setupagain to show elec-trode performance. If the meterhas accepted two buffers, it willdisplay Good Electrode, displaythe slope between the first andsecond buffers and display thetwo buffer Pressing setupagain shows theelectrode slope between thesecond and third buffers (ifthree buffers have beenentered) and shows the secondand third buffer 4 7standardizesetupentermodeOK 4 7pHstandardizesetupentermodeOK 7 10pHstandardizesetupentermodeNote: These screens will only bedisplayed if buffers are Presssetupagain to display aflashing Set Buffersicon and todisplay the first buffer set ( ser) Press enter to select the set ofbuffers shown on the displayorPress setupagain to view thenext set of buffers (Merck bufferset).

8 Continue pressing Setup toview the third buffer set (NIST buffer set).Set 2 4 7 10 12pHstandardizesetupentermodeSet1 3 6 8 10 13pHstandardizesetupentermode12 Standardizing for MillivoltMeasurement/ Relative Millivolts(UB-10 Model only)You use millivolt measurement for electrode diagnostics, titration or mea-suring redox potential (also called ORP, oxidation reduction potential). ORPmeasurements indicate the oxidizing or reducing capability of a can use ORP values to monitor or control solutions requiring a setamount of oxidants or Immerse electrode in a stan-dard solution. 2. Press the mode button untilyour digital display indicates mVmode. 3. Press standardizeto enter a mVstandard and read relative When the signal becomes sta-ble, or when you press enter,the current absolute mV valuebecomes zero relative CSstandardizesetupentermodemV CSstandardizesetupentermoderelmV CSstandardizesetupentermode131.

9 To clear a mV offset and return toabsolute millivolt mode, presssetup. The Meter displays aflashing Clearicon, and showsthe current relative millivolt To clear the mV standard, pressenter. You then return toabsolute mV CSstandardizesetupentermodeUsing Setup in mV Mode (UB-10 Model)14 Understanding pH TheoryDefining pHThe measurement of pH plays an important role in identifying andcontrolling acidity and alkalinity levels for industry and is a measure of the acidity or alkalinity of a solution and can berepresented by this equation:pH = -log [H+]with [H+]representing the concentration of hydrogen ions in thesolution. pH is sometimes referred to as the power of the hydro-gen ion in a using a pH Meter , you can determine exact pH levels of solu-tions. For example, rather than say that lemon juice is quite acidic,you can say that lemon juice has a pH of An exact pH valuecan be used to control or measure acidity levels for manufacturingprocesses or for basic values generally range from 0 to 14, with a pH value of 7 beingthe neutral point, or the value of pure water.

10 PH values greaterthan 7 represent increasing alkalinity, whereas pH values below 7represent increasing acidity (Figure 1).Strong AcidLemon JuiceTomato JuiceCoffeePure waterBaking SodaAmmoniaStrong BaseNeutral0 1 2 3 4 5 6 7 8 9 10 11 12 13 14more acidicmore basicpHFigure Scale showing the relative acidity or basicityof some common TemperatureCompensationNOTE: Temperature compensation only takes effect when an ATCprobe is are two ways that temperature compensation affects pHmeasurement:1. Buffer pH values change with buffer changes depending on the temperature of the values are typically found on the label of the buffer. Thetables below are representative of most standardization is performed in pH mode, the pH value isadjusted to the current value for the current temperature. For example, if your pH 7 buffer isat 20 C the Meter will standardizeyour buffer at instead of is the value at 25 The electrode efficiency changeswith standard mV change per pHunit is approximately at 25 , as shown in the belowgraph, this mV per pH unit valuechanges as temperature Meter compensates for this change by changing the pH read-ing as temperature Standard BufferpH pH pH (mV)500-50000714100 C (74mV/pH unit)50 C (64mV/pH unit)0 C (54mV/pH unit)