HACH LANGE 2100N User Manual
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Contents
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7. Read and record thevalue when stable.Note: To send (viaRS232) a measurementrecord, push PRINT.Measurement techniquesMeasurements may be made with different operation mode settings andoptional accessories.Calibrate the instrument whenever the sample cell pathlength ischanged.Manual or automatic rangingThe manufacturer recommends that ranging be set to automatic for mostmeasurements.The setting can be changed at any time during sample measurement.Push RANGE repeatedly to step the instrument from automatic rangingto manual ranging and then scroll through the manual range settings.The Manual Range light turns on when manual ranging is selected. TheAuto Range light turns on when automatic ranging is selected.Notes:• When manual ranging is selected, the display flashes all 9s when thesample being measured is greater than the selected range. Thedisplay flashes all 0s when the sample measured is less than theselected range.• When automatic ranging is selected, the display flashes 9s when thesample is greater than the maximum range of the instrument. Thedisplay flashes 9s when Ratio is off and the measurement is greaterthan 40 NTUs (268 nephelos or 9.8 EBCs). Turn Ratio on to increasethe range. Refer to Measure over-range samples on page 23.• When automatic ranging is selected, the display flashes all 0s whenthe measurement is less than the range of the instrument or anegative value. Calibrate the instrument.Signal averaging on or offSignal averaging corrects for reading fluctuations that are caused byrandom drifting particles in the sample. When signal averaging is on, anaverage reading is calculated every 3 seconds and shown on thedisplay.The last ten measurements are used to calculate the averagereading.The manufacturer recommends that signal averaging be on for mostmeasurements.Push SIGNAL AVG to turn signal averaging on or off. The SIGNAL AVGlight turns on when signal averaging is on.Push ENTER when signal averaging is on to erase data in the signalaveraging buffer and provide an immediate update on the display asnecessary. This is especially useful when measuring samples with largedifferences in turbidity.26 English |
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