Density & Concentration Measurement: Coriolis VS Tuning Fork

Many manufacturers recommend Coriolis Mass Flow Meters for density and concentration measurement.

In comparison with Bopp & Reuther DIMF density meters (tuning fork principle) the branded Coriolis devices show several disadvantages:

• lower accuracy and repeatibility
• slower stability with temperature changes
• calibration usually for max. flow accuracy (vs density optimization)
• expensive for big pipe sizes and aggressive chemical applications

Comparison:

Parameter	Branded Coriolis Meters	DIMF Density Meter
Accuracy	0.2 – 0.5 kg/cbm	0.1 kg/cbm
Temp. Change Stability	1.5 – 2 sec adjustment	0.5 sec adjustment (3/4x faster)
Installation	inline (flow and density together)	bypass, (no shut down, easy dismantling)
Calibration	usually to maximize flow, 1-2x/year	maximize density, long term stability
Chemical Applications (Hastelloy/Tantalum)	expensive (esp. for big pipe sizes)	3x cheaper (bypass minimizes material),   DIMF + El-Mag FM with PTFE lining more economic

More on DIMF Tuning Fork Measurement