HACH LANGE 2100N User Manual
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Contents
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flow cell, put the glass flow cell in liquid detergent for 24 hours andthen rinse fully.• When measuring many samples of different turbidity, measure thesamples in order of the cleanest (lowest turbidity) to the dirtiest(highest turbidity) to prevent contamination from one sample to thenext.• Do not use greater than the recommended maximum sample pressureof 34 kPa (5 psig).• Keep the drain tubing below the center line of the instrument. If thewhole 152 cm (60 in.) length of drain tubing is used, make sure thatthe end of the drain tubing is at least 46 cm (18 in.) below the centerline of the instrument.Flow cell storage• Install the reservoir cover when the system is not in use to preventcontamination of the system by airborne particles.• For short-term storage (a few hours), flush the system with distilled ordeionized water and leave the flow cell full of the flush water tominimize air locks and build up of residue on the parts.• For long-term storage, disassemble, fully clean and air dry all parts.Using a manual flow cellTo set the flow rate, increase the height of the collection drain assemblyon the support rod to decrease the flow rate. Make sure that the bottomof the collection drain assembly is no lower than 7.5 cm (3 in.) above thesupport stand base.To flush the flow cell, lower the collection drain assembly to the supportstand base to flush the flow cell.Use a cell adapterMany different test tubes, sample cells and ampules can be used tomeasure samples when a cell adapter is used. Use a cell adapter whenthe test tube, sample cell or ampule is less than 25 mm. Refer toAccessories on page 40 for the available cell adapters.Use only test tubes and sample cells that are free of significantscratches. Clean and apply silicone oil to all sample cells, test tubes andampules used with the cell adapters. Refer to Clean the sample cellon page 17.Note: Performance specifications may be different than shown in Specificationson page 5 when test tubes, sample cells or ampules less than 25 mm are used.Use a cell adapter when:• Only a small quantity of sample is available.• The sample to be measured is in an ampule that cannot be opened.Refer to Table 3 for minimum sample sizes.Table 3 Minimum sample sizesTest tube size Sample12 mm 2.5 mL13 mm 3.5 mL16 mm 5 mL19 mm 7 mLInstall a cell adapter1. Align the tab on the cell adapter toward the front of the instrument(Figure 9).2. Put the cell adapter in the sample cell holder.3. Calibrate the instrument each time the sample cell diameter ischanged. Calibrate using sample cells of the same path length as thesample cell that will be used to measure samples.Note: If test tubes are taller than the cover for the sample cell compartment,use the tall light shield provided with the cell adapter.English 29 |
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