Badger Meter Series 735 Sensors - Manual (Page 4)

MECHANICAL INSTALLATION
Depressurize and vent piping system prior to any installation or maintenance of the flow sensor.
General
The accuracy of flow measurement for all flow measuring devices is highly dependent on proper location of the sensor in the
piping system. Irregular flow velocity profiles caused by valves, fittings, pipe bends, etc. can lead to inaccurate overall flow
rate indications even though local flow velocity measurement may be accurate. A sensor located in the pipe where it can be
affected by air bubbles, floating debris, or sediment may not achieve full accuracy and could be damaged. Badger Meter flow
sensors are designed to operate reliably under adverse conditions, but the following recommendations should be followed to
ensure maximum system accuracy:
•
Choose a location along the pipe where ten pipe diameters upstream and five pipe diameters downstream of the sensor
provide no flow disturbance. Pipe bends, valves, other fittings, pipe enlargements and reductions should not be present
in this length of pipe.
• The preferred location for the sensor around the circumference of a horizontal pipe is on top. If trapped air or debris will
interfere, then the sensor should be located further around the pipe from the top but not more than 45 degrees from
top dead center. The sensor should never be located at the bottom of the pipe, as sediment may collect there. Locations
off top dead center cause the impeller friction to increase, which may affect performance at low flow rates and increase
wear. Any circumferential location is correct for installation in vertical pipes. Rising flow preferred to reduce effects of any
trapped air.
Series 735PV Plastic Tee Type Impeller Flow Sensor
Page 4 January 2013