Operation Manual for - Mrclab.com

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Ultrasonic milk analyzerFor Sensorex pH electrodes, originally supplied with Lactoscan read thefollowing information:Temperature compensationsThe output of pH electrodes varies with temperature in manner, predicted bytheory. When needed, Sensorex can supply electrode holders with build-inautomatic temperature compensators. The need of automatic compensationdepends on the temperature variation, the pH value being measured. At pHof about 7 there is no error due to temperature and, of course, at a constanttemperature there is no error. As shown in the following table, the pH errordue to temperature is a function of both the temperature and the pH valuebeing measured. At a pH of about 7 there is no error due to temperature and,of course, at a constant temperature there is no error. The more thetemperature changes from the ambient calibration temperature and the morethe pH departs from 7 the greater is the pH error.pH temperature error table°C pH2 3 4 5 6 7 8 9 10 11 125 .30 .24 .18 .12 .06 0 .06 .12 .18 .24 .3015 .15 .12 .09 .06 .03 0 .03 .06 .09 .12 .1525 0 0 0 0 0 0 0 0 0 035 .15 .12 .09 .06 .03 0 .03 .06 .09 .12 .1545 .30 .24 .18 .12 .06 0 .06 .12 .18 .24 .3055 .45 .36 .27 .18 .09 0 .09 .18 .27 .36 .4565 .60 .48 .36 .24 .12 0 .12 .24 .36 .48 .6075 .75 .60 .45 .30 .15 0 .15 .30 .45 .60 .7585 .90 .72 .54 .36 .18 0 .18 .36 .54 .72 .900 pH Error Range Less than .1 pH Error Range5. PH helpful hintsFor greatest accuracy in pH measurement, follow these guidelines:Use the same technique to measure samples, which was used for calibration.Be consistent with stirring rates, times and conditions.Calibrate with buffers, which are close in temperature to that of the sample.Calibrate the pH electrode regularly, e.g. once an hour for accuracy to within0.01 pH, or once a day for accuracy to within 0.1 pH.Use fresh buffers for calibrations. Avoid contamination of the stock buffersolution and do not use it beyond the expiry date.Keep all connections dry.Operation manual 82/98
Ultrasonic milk analyzerImmerse the electrode far enough into the solution to insure the referencejunction is below the surface.Allow adequate time for the electrode to stabilize in standards and samplesbefore taking a reading.Clean the electrode periodically. Allow more time for aged electrodes.Do not use the pH electrode in solutions of fluoride ion at low pH. This willetch the glass membrane.Sulphide vapors can permeate the electrode wick and contaminate thereference element. Minimize contact in such environments and change thereference electrolyte frequently.6. PH measuring.Measuring pH is an additional feature of the analyzer and is optional.Remove the protective rubber cap of the pH electrode. Take care to handle itappropriate in order not to be damaged. Use de-ionized or distilled water torinse the electrode before usage. Fill in the sample holder with milk, put it inthe recess of the analyzer and dip the pH electrode into the milk sample,ensuring complete dip of the electrode in the sample. Stir gently forhomogenization of the sample.Measuring can be done in two modes:Off line by starting the menu pH & Co Meter | Measuring, when theanalyzer works only as a pH meter.On line automatic pH measuring, when measuring the rest of the sample’sparameters.After starting the menu pH & Co Meter the following message appears onthe display:pH CalibrationpH MeasuringpH En/DisablepH U Display-------------------------pH TestCo Meter CalibrCo Meter TestCo Meter En/Dis-------------------------ExitOperation manual 83/98
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Ultrasonic milk analyzerSwitching A
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Ultrasonic milk analyzerPARTS AND A
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Ultrasonic milk analyzer1. FUNCTION
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Ultrasonic milk analyzer2.2. Measur
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Ultrasonic milk analyzerfig. 2 Back
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Ultrasonic milk analyzerFig. 4Perip
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Ultrasonic milk analyzer3. QUALIFIC
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Ultrasonic milk analyzerThe analyze
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Ultrasonic milk analyzer4. CLEANING
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Ultrasonic milk analyzerFill in the
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Ultrasonic milk analyzer5. POSSIBLE
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Ultrasonic milk analyzer6. MAKING C
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Ultrasonic milk analyzer6.3.2. Prep
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Ultrasonic milk analyzerMilkanalyze
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Page 47 and 48: Ultrasonic milk analyzer8. ADDITION
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Page 68 and 69: Ultrasonic milk analyzer1.8-2% FAT;
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Page 78 and 79: Ultrasonic milk analyzerAPPENDIX 7
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Page 88 and 89: Ultrasonic milk analyzermS/cm (18°
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Page 98: Ultrasonic milk analyzerGUARANTEE C
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