PULSAR MEASUREMENT
25
SENSOR MOUNTING LOCATION
The position of the sensor is one of the most important considerations for accurate flow measurement. The same
location guidelines apply to Doppler as most other types of flow meters.
VERTICAL OR HORIZONTAL PIPE - Vertical pipe runs
generally provide evenly distributed flow. On Horizontal
pipes and liquids with high concentrations of gas or solids,
the sensor should be mounted on the side (3 or 9 o’clock
position) to avoid concentrations of gas at the top of the
pipe, or solids at the bottom. For liquids with minimal gas
bubbles (e.g. potable water) the sensor should be mounted
on the top of a horizontal pipe (12 o’clock position) to obtain
the best signal strength.
STRAIGHT RUN REQUIREMENTS – For best results, the
transducers must be installed on a straight run of pipe,
free of bends, tees, valves, transitions, insertion probes
and obstructions of any kind. For most installations, ten
straight unobstructed pipe diameters upstream and
five diameters downstream of the transducers is the
minimum recommended distance for proper
operation. Additional considerations are outlined below.
• Do not, if possible, install the transducers downstream from a throttling valve, a mixing tank, the discharge of a
positive displacement pump or any other equipment that could possibly aerate the liquid. The best location will
be as free as possible from flow disturbances, vibration, sources of heat, noise, or radiated energy.
• Avoid mounting the transducers on a section of pipe with any external scale. Remove all scale, rust, loose paint,
etc., from the location prior to mounting the transducers.
• Do not mount the transducers on a surface aberration (pipe seam, etc.).
• Do not mount transducers from different ultrasonic flow meters on the same pipe.
• Do not run the transducer cable in common bundles with cables from other instrumentation. You can run these
cables through a common conduit ONLY if they originate at the same flow meter.
• Never mount transducers under water.
IMPORTANT NOTE: In some cases, longer straight runs may be necessary where the transducers are placed
downstream from devices which cause unusual flow profile disruptions or swirl. For example: modulating valves, or
two elbows in close proximity and out of plane.
5 Dia
10 Dia
FLOW
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