Serviceable measuring device

A measuring device for measuring a parameter of a medium flowing in a pipeline comprising:

• a chamber;
• a shaft suspended in said chamber having a retraction state and an insertion state;
• and,
• a pivotable blade, pivotally coupled to one distal end of said shaft, having a first orientation in said retraction state with respect to said one distal end of said shaft and a second orientation, substantially different from said first orientation with respect to said one distal end of said shaft, in said insertion state wherein said pivotable blade freely rotates to said second orientation for measuring said parameter of said medium and freely rotates to said first orientation when entering said chamber.

A method of inserting and retracting a measuring unit into and from a pipeline wherein said pipeline has flowing therein a medium, said measuring unit comprising a chamber and a shaft, said method of inserting and retracting a measuring unit comprising the steps of:

• a) longitudinally moving said shaft in a first direction in said chamber;
• b) simultaneously with a rotating said measuring unit from a first orientation to a second orientation, freely, about a first distal end of said shaft;
• c) orienting freely said sensor means in the flow of said medium;
• d) longitudinally moving said shaft in a second direction in said chamber;
• and,
• e) simultaneously with a rotating said measuring unit from the second orientation, freely, about said first distal end of said shaft, to said first orientation.

A blade housable in a chamber coupled to a pipeline for repeated retraction and insertion of said blade in said pipeline comprised of:

• a flat and thin rectangular member with a long dimension and a short dimension and with a modified first short end and a modified second short end;
• and,
• wherein said modified first short end is curved;
• and,
• wherein said modified second short end is formed as a circular head attached to a hunched-back neck with a chest contoured to serve as a guide for use when retracting said blade from said pipeline;
• and,
• wherein said circular head provides a pivot means for swinging said blade into said pipeline;
• and,
• wherein said long dimension is at least twice said short dimension.