Baseline Systems BL-PFS200 Flow Sensor - Manual (Page 2)

Choosing the Proper Location and Orientation
Because an impeller sensor measures the velocity of the liquid and converts it to a flow
measurement based on area, proper flow measurement depends on the condition of the pipe
interior and the sensor’s location in the piping system. The pipeline must be full, free from trapped
air, floating debris and built-up sediment.
 The mounting tee should be installed with a minimum of 10 diameters of straight pipe (15
inches for 1½ inch pipe), upstream and a minimum of 5 diameters of straight pipe (7½ inches
for 1½ inch pipe) downstream to eliminate irregular flow profiles caused by valves, fittings or
pipe bends.
 Always install with the flow arrow on the mounting tee pointed downstream.
 Allow 3¾” clearance to remove the flow sensor housing from the tee for service. The tee is
usually installed with the housing up in the vertical or 12 o’clock position. However, if
necessary, it may be installed with sensor housing at an angle from vertical to provide
clearance.
 Flow sensors may be installed inside a building, outside above grade or underground. If
installed above grade, provide adequate security to prevent damage or disassembly. If
installed below grade, provide access for service.
 Flow sensors are most typically installed below grade in a horizontal section of pipe with the
sensor housing up. Do not direct bury the flow sensor. Provide a meter pit or valve box of
adequate size and drainage to service the sensor. Provide a service loop in the wire
connections to allow the sensor housing to be brought above grade.
 Flow sensors may be installed on vertical sections of pipe providing that the piping is full and
does not contain trapped air. A vertical pipe with rising flow is preferred over falling flow. The
sensor housing may be oriented in any direction radially around the pipe.
1-866-294-5847
Rev 03262013
www.baselinesystems.com
BL-PFS100, BL-PFS150, & BL-PFS200
Two-Wire Ready Flow Sensor Installation