CALDON SVM 389Ci Self-Verifying Meter for Gas

Quantitative and continuous self-verification

Over time, ultrasonic meters have continued to evolve with significant improvements in both accuracy and repeatability, as well as the ability to monitor their long-term performance through the use of diagnostic information and condition-based monitoring (CBM) software. As users move away from traditional verification methods due to the CAPEX and OPEX considerations, the ability to monitor the performance of the ultrasonic meter has become more important than ever before.

CALDON SVM technology employs our proven 8-path configuration for its primary measurements. The 8-path configuration uses crossed paths in each of four chordal planes to effectively cancel the effect of non-axial velocities and accurately integrate the axial velocity profile. This technology is the foundation of our SVM 389Ci which is a 16-path meter incorporating three significant features to produce an ultrasonic meter with unique and unrivaled self-verification ability:

1. Axial velocity measurement verification per chord.

2. Fifth chordal measurement plane to facilitate 4-chord (8-path) versus 5-chord (10-paths) evaluation of flow profile uncertainty.

3. Vertical reflective path for detection of entrained liquid or contamination.

SVM technology enables the simultaneous calculation of measurement uncertainty alongside each flow measurement calculation – updated once per second. In addition to the continuous and instantaneous output of uncertainty in terms of volumetric flowrate or a relative percentage value, SVM totalises uncertainty values internally.

CALDON SVM 389Ci Ultrasonic Flow Meters can be used on gas systems where there are challenges in verification methods, a desire to gain further confidence in measurement performance, reduction in infrastructure, CapEx and OpEx.