Hi, my name is Jeff Cassells and I'm a Regional Sales Manager with Pulsar Measurement. Hi,
I'm Adrian. Also a Regional Sales Manager with Pulsar Measurement.
Today we're going to talk about level measurement applications within the wastewater industry. We
particularly want to highlight the problems associated with obstructions within a wet well,
which can very often cause unreliable readings. The obstructions could be chains, guide rails,
the tops of pumps, fat build-up, or benching, to name a few. Pulsar Measurement has developed a
technique to overcome these issues. This technique makes use of our advanced echo discrimination
software that is known as DATEM (Digital Adaptive Tracking of Echo Movement). This is embedded in
all of Pulsar ultrasonic and radar systems and requires the adjustment of just one parameter;
parameter 21. To demonstrate this, we'll carry out what has become known
as the Briefcase Dance. To demonstrate this we're using a dB6, 6-meter range, ultrasonic transducer,
coupled with our latest Ultra 4 controller (transceiver). You can see on the floor the
dB6 transducer is positioned and it's actually firing through the briefcases which represent
the fixed obstructions to the bottom briefcase, which represents the empty level.
On the screen, you can see the echo profile coming back from the Ultra 4, which shows the distinct
echos from all of the briefcases. So, let's have a look at the echo profile. If I explain,
this here is the top of the well where the transducer is located. Along the bottom,
you see numbers which represent distance away from the transducer in meters. The red line indicates
the true echo coming back from the transducer. The first peak represents the first briefcase as does
the second and the third. However, the fourth peak represents the true empty level. As Jeff mentioned
previously, the true echo is at a distance of around 3.1 meters. What I am now going to do is
access parameter 21, which will then ask me to enter the relevant distance which I will do as 3.1 meters.
It is now setting that distance; it is looking for the echo around that level and all should be good.
We now see the distance is gone to 3.13 meters. So, Aide has entered parameter 21 at 3.1 meters
and you can see here that this blue line indicates that we are locked on to the
level of the water at 3.1 meters. However, in a wet well, the level never remains constant
and always moves. So if I can simulate the water level moving by bringing up the water level here,
you will now see that the locked-on distance will change. It takes a few moments for this to happen.
But you can now see we are now locked on to an echo much closer to the transducer
because this is where the water is. If we bring the water level even further up,
you'll see that change again and we will actually lock on to this level somewhere around about here.
Again, it takes a moment or two to change, but there we go. We are now locked on to
the level. The water will then recede as we pump down, back down to the original level.
And you can now see that the water level has receded and we will now lock on to
the true level again much more in the well.
And the way we've done that, is we have DATEM'd out all of the unwanted echos, so that they are never
considered as a true echo in the future. This demonstrates that Pulsar Measurement ultrasonic
and radar systems can provide reliable performance even in these most challenging applications.
This capability is built into all Pulsar instruments. Thank you. I hope you've found
this useful. To see our full product range, please visit our website pulsarmeasurement.com.