Description
The Pulsar Guard 200x series
products are non-invasive ultrasonic sensors designed to detect
process activity by listening to the variations in ultrasonic
energy produced.
Application
This sensor was specifically
designed for use in the oil industry, there was a demand for
detecting sand produced by the process of oil extraction. This
sensor is particularly good at rejecting flow noise in multi
phase situations.
Due to the way in which this
sensor is mounted it is particularly suitable for attaching to
pipe work. It can detect the presence of particles in a liquid
or whether solids are flowing. The sensor is best fitted just
after a bend where the acoustic activity tends to be highest.
Operation
The Pulsar Guard series 200x
sensors all work on the same basic principle, the product
contains a piezo ceramic crystal that gives an electrical output
depending on the minute vibrations caused by ultrasonic
activity. A sensitive amplifier increases the signal from the
crystal element and this is then enveloped to give a smoothed
version of the high frequency signal. The output is a varying
voltage ( 0 to 5V ) with a time constant of 100uS.
