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If the turbidimeter reads dessicant, the dessicant needs to be changed. When looking down on the turbidimeter from the top there are four silver screws, one on each corner. When these are removed the entire top of the turbidimeter including vial and display can be lifted. It is inside this compartment that the desiccants are located. The desiccants are important because they keep the compartment with the turbidimeter vials dry. A humid chamber can cause condensation on vials that will give false readings.
When this occurs bring the desiccant back to Hollister room 150 and leave it in the heating oven overnight at 100ºF. This will regenerate the desiccant and it will become active again.

Wiki Markup Turbidimeters need to be \[recalibrated\|How to Calibrate Turbidimeters\] every two months.  The recalibration kit is located in the AguaClara LAb in Hollister Hall.  Turbidimeters need to be recalibrated every two months. The recalibration kit is located in the AguaClara Lab in Hollister Hall.

Sampling line

A common problem that occurs is that the lines from the sampling point to the turbidimeters fill with sediment and the pump is unable to get water through them. If this happens, you should remove the clogged line, including all connections, and clean them. As this is a common problem, you may want to clean the lines before starting an experiment to increase your chances of a successful experiment. Back washing them may also help solve this problem. Some times clogs form the inlet valve for the raw water sampling line. Toggling the valve to increase and decrease pressure in the line should solve this problem.

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