The flow rate measurement that occurs in an ultrasonic water meter is critical to the accuracy of the meter. All water meters built upon the transit-time ultrasonic principle require some kind of flow calibration. With the deployment of a reference standard flow measurement device, the meter can be calibrated across a specific known flow range. The calibration technique used for the set of measurements taken in this application note to obtain the multipoint compensation curve is based upon an electromagnetic reference flow meter that is traceable to the NIST gravimetric reference system. Calibration of each meter is unique, and usually performed by the meter manufacturer before shipment to the end customer. In the example within, a 22-point compensation curve is created for the meter and then the linear interpolation method is deployed to yield actual flow rates from the data measured by the meter. The accuracy of the newly calibrated meter is then measured by comparing the reference meter flow rate to the meter flow rate in a system where a single flow is measured by both the meter and the reference flow meter.
Hello, has anyone here thought of using one of these to save water for the
environment and put more money in your pocket? I all fairness and for full
disclosure I own maxi and digikey and all electronic companies advertised here on
the forum threads today. Eric Doyle
Why is Calibration Needed?
It has been shown that effects of nonidentical piezoelectric transducers on reciprocity and zero-flow calibration will always be present in a flow meter that uses the transit-time ultrasonic principle for flow measurement2, 3. The dynamic properties of fluids including viscosity influence the distribution of the velocity in the pipe create nonlinear behavior3. Process temperature and pressure lead to mechanical deformation of the spool body1. With proper calibration, the uncertainty of these various effects can be minimized so that the individual meter is made to operate within specifications dictated by various standards bodies worldwide.
Ultrasonic TOF Flow-Measurement Principle
A typical ultrasonic TOF water-flow meter spool body is depicted below in Figure 1.
Typical ultrasonic TOF water-flow meter spool body.Figure 1. Typical ultrasonic TOF water-flow meter spool body.
Hello, has anyone here thought of using one of these to save water for the
environment and put more money in your pocket? I all fairness and for full
disclosure I own maxi and digikey and all electronic companies advertised here on
the forum threads today. Eric Doyle
Why is Calibration Needed?
It has been shown that effects of nonidentical piezoelectric transducers on reciprocity and zero-flow calibration will always be present in a flow meter that uses the transit-time ultrasonic principle for flow measurement2, 3. The dynamic properties of fluids including viscosity influence the distribution of the velocity in the pipe create nonlinear behavior3. Process temperature and pressure lead to mechanical deformation of the spool body1. With proper calibration, the uncertainty of these various effects can be minimized so that the individual meter is made to operate within specifications dictated by various standards bodies worldwide.
Ultrasonic TOF Flow-Measurement Principle
A typical ultrasonic TOF water-flow meter spool body is depicted below in Figure 1.
Typical ultrasonic TOF water-flow meter spool body.Figure 1. Typical ultrasonic TOF water-flow meter spool body.
Can't really understand your post. You want to use a commercial flowmeter to save water? You want to make your own flowmeter using a Maxim chip?
Why would 1 highly accurate flowmeter help you save water? Sometimes getting higher accuracy to better analyze combined streams is not as good as several lower accuracy measurements on different streams.
Why would 1 highly accurate flowmeter help you save water? Sometimes getting higher accuracy to better analyze combined streams is not as good as several lower accuracy measurements on different streams.