ONICON System-40-BAC BTU - Manual (Page 9)

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System-40-BAC BTU Meter Manual 03/15 - 1045-2 Page 9
3.2 INSTALLING THE FLOW SENSOR
When properly installed, the flow sensor will only measure flow associated with that portion of the
piping system for which the energy measurement is being made. The flow sensor may be installed
in either the supply or return pipe of the heat exchange circuit. Before you install the meter, the
entire piping system should be flushed and free of debris. Please refer to the diagrams below when
selecting the installation location. While many installation locations require little, if any, straight
unobstructed pipe upstream or downstream of the sensor location, it is always recommended that
the sensor be located with as much straight pipe upstream of the sensor as possible.
A. This is a recommended position for the flow sensor.
B. This is a recommended position for the flow sensor.
C. Avoid installation locations where air can become trapped in the piping system.
D. This is an acceptable installation location for closed loop pressurized systems.
E. Do not install the sensor downstream of modulating valves or partially open valves.
Fully open isolation valves (e.g. ball valves) are OK.
F. Do not install the flow sensor at the inlet of a pump or anywhere else where the
operating pressure in the pipe may drop below ambient pressure levels. To prevent
cavitation, the minimum recommended operating pressure at the installation location
should be at least 5psig.
G. Avoid installing the meter downstream of multiple bends out of plane with each other
where there are less than 10 diameters of straight unobstructed pipe between bends.
A
B
C
D
E & F
G
Flow Direction
Flow Direction