| 摘要 |
A testing apparatus comprising: a chamber ( 5 ) having an inlet ( 6 ) and an outlet ( 16 ); a measuring device ( 4 ), at least a part of which is provided within said chamber; wherein the inlet is arranged to direct fluid onto said part of the measuring device within the chamber in order to clean the measuring device during start up. Thus the density or viscosity of drilling mud may be continuously monitored. Preferred embodiments include an outlet valve such as a ball valve ( 7 ) with a bore defined therein. The bore allows fluid to flow therethrough even in a valve "closed" position and so generates the preferred back pressure whilst minimising the risk that the valve will block. A pressure activated drain valve ( 9 ) is also provided to substantially empty the chamber when not in use. When the apparatus is reactivated, an inlet tube is adapted to jet air and then fluid at the measuring device in order to remove debris therefrom. Thus the apparatus has the important benefit of self cleaning during start-up.
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