FlowCERT

Installation
Limitation of Performance
Correct installation and the positioning of the Speedy sensor is essential for
maintaining measurement accuracy and the reliability of a Speedy velocity
unit, and there are a number of factors which will limit the performance of
the Speedy Velocity Sensor.
1. Temperature – the speedy velocity sensor should only be operated
in the temperature range stated in the Product Specification section
of this Chapter, operation outside of this temperature range will
have a significant effect on the accuracy of velocity measurement.
2. Measurement Medium – the speedy velocity sensor uses ultrasonic
Doppler technology and therefore relies on the transmitted signal
being reflected back to the sensor from particles (solids) contained
in the media, it is therefore not suitable for the measurement of
velocity in media that do not contain particles e.g. clean water.
Speedy should only be used in medium that is compatible with the
materials used in the construction of the speedy, resistance and
compatibility lists for the materials used are available from Pulsar
on request. Highly abrasive medium may lead to mechanical wear
of the sensor and in the case of high velocities or large particle size
this may result in permanent damage to the sensor.
3. Hydraulic disturbance – correct installation, of the Speedy sensor,
in the vicinity of bends, profile changes, gates/slides and any form
of hydraulic ramp/jump are essential to ensure accuracy of
measurement. Changes to direction of flow (streaming or
reverse/surge flows) must also be avoided at the point of
measurement.
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