Baseline Systems BL-PFS400 Flow Sensor - Manual (Page 2)

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Rev 03262013
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Choosing the Proper Location and Orientation
Because Baseline’s PFS flow 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 saddle should be installed with a minimum of 10 diameters of straight pipe (for
example, 30 inches for 3 inch pipe) upstream and a minimum of 5 diameters of straight pipe
(for example, 15 inches for 3 inch pipe) downstream to eliminate irregular flow profiles
caused by valves, fittings or pipe bends.
 Always install with the flow arrow on the sensor pointed downstream. Allow 3 ¾” clearance to
remove the PFS flow sensor insert from the saddle for service. The saddle is usually installed
with the housing up in the vertical or 12:00 o’clock position. However, if necessary, it may be
installed with sensor housing at an angle from vertical to provide clearance.
 Baseline’s PFS 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.
 Baseline’s PFS 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 allowing the sensor housing to be brought above grade.
 Baseline’s PFS 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.
BL-PFS300 & BL-PFS400
Flow Sensor Installation