Accumet XL 20 User Manual
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Contents
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121Ion Operation: Direct Reading MethodsXL25, 50 and 60 metersThere are two direct reading methods:Direct Reading with Standards andDirect Reading with Blank Offset.These types of measurements allow you to directly read the concentration of your sample afterstandardizing the meter with ion standards of known values or blank values.Direct Reading with StandardsThis is the most common method of ion measurement. You can directly read the concentration ofthe sample after standardizing the meter with ion standards. An ionic strength adjuster (ISA) isadded to both the standards and the sample. Two to five standards are used to standardize themeter. The standards should bracket the expected value of the sample.To Standardize the Meter Using Direct Reading with StandardsYou must use a minimum of two standards to standardize the meter. Make sure you haveselected “Direct Reading with Standards” on the Ion Setup screen.1. Add ionic strength adjuster to your standard.2. Immerse your rinsed electrode(s) into the standard solution and stir gently.3. Touch the Standardize button on the Ion Measure screen to access the standardizationscreen.4. Touch Clear if necessary to remove a previous standardization. If the screen says “NotStandardized,” proceed to step 5.5. The screen will flash each standard icon once, then a numeric keypad will appear. Usingthe displayed keypad input the value of the standard that you are using to standardize themeter. Touch Enter to accept this value. The meter now shows the value of the standardsolution in the flashing beaker.6. Wait until Stable* appears on the screen. Press Confirm button once to confirm thestandardization. To manually override the stability requirement, press Confirm before thestable message appears after the ion beaker starts flashing with the standard value.7. Touch Standardize and repeat steps 3-7 with up to 5 standards. A minimum of twostandards is required to standardize the meter in this mode.8.* Please note that STABLE will only appear if you have completed a successful two point calibration.Updating the standardization is not possible. Once five point standardization is complete, if youpress the Standardize icon the meter will prompt the message to clear the previousstandardization.If the meter has not been standardized with at least two standards, a series of dashes will appearin place of a measurement value. |
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