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Operational principle

RK086 Insert type tuning fork density meter is designed according to the theory of resonance. The vibration components is similar to two teeth of the tuning fork, the fork body vibration because of a piezoelectric crystal was located in the root of tooth, vibration frequency is detected by a piezoelectric crystal , through shifting the phase and amplifying circuit, the fork body is stable in the natural resonant frequency.

When the liquid flows through the fork body, vibration changes, caused the change of resonant frequency, thus through electronic processing unit to calculate accurate density value. The relationship between vibration frequency and density as:

Insert type tuning fork density meter has been widely used in industrial field, it is not afraid of hanging, not afraid of the impact, high sensitivity. It using tuning fork "resonance" principle, piezoelectric element is electrically driven by vibration, only probe rod surrounded by material surrounded by the amplitude of vibration is sharply reduced, resulting in switching action.
ρ=K0+K1T+K2T2

In the formula: ρ--liquid density

T--vibration period of sensor output

Measurement range	0.000 - 3.000 g/cm 30.000 - 3000 kg/cm3 （User selection）
Calibration range	0.000 - 3.000 g/cm 30.000 - 3000 kg/cm3 （According to the user selected）
Accuracy of measurement	±0.002 - 3.000 g/cm3、±0.005 g/cm3 （The user select the trial precision）
Repeatability	±0.002 - 3.000 g/cm3（±0.005 g/cm3）
Operating temperature range	-50℃～+200℃ Different medium temperature optional, divided into normal temperature, high temperature type
The maximum working pressure	207 bar（3000 psi）
Fluid viscosity range	0 -20000 cP
Temperature coefficient	＜0.1kg/cm3/℃
Pressure influence	Off The Record
Built-in temperature sensor	PT1000
Liquid materials	316L、Hastelloy C276、titanium、Four fluorine polyethylene（Teflon）、Zirconia
The fork body coating	Standard、PTFE、Zirconia
Power supply	24VDC, ≥500 mA
Intelligent signal output	4 - 20 mA、0 - 100%、HART
Output accuracy（20℃）	±0.1% or 0.05% FS
Output repetitive	±0.05% FS
Process connection	Helical、Flange Type、Sanitary type（ size can be decreased according to the site or the requirement of user ）Figure:WS-1
Protection grade	IP67
Enclosure	Aluminum alloy polyurethane coating
Explosion-proof type	EXd II CT4/5/6

Advantages: Simple installation, plug and play, free maintenance. It can be measured the mixed medium density which have solid or bubbles.

Disadvantages: The density meter is not good at measuring easy crystallization or scale medium. You can choose another density meter which is Differential pressure type intelligent online density meter.

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tuning fork density

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