The kdm280 tuning fork densitometer adopts an insertable installation and is widely used for medium density detection in pipelines, open tank containers, and closed tank containers. The fluid density directly depends on the vibration frequency received by the tuning fork when the sensor is inserted into the medium. The sensor is equipped with a built-in temperature sensor to provide temperature compensation.
Rosemount densitometerIntroduction
The kdm280 tuning fork densitometer adopts an insertable installation and is widely used for medium density detection in pipelines, open tank containers, and closed tank containers. The fluid density directly depends on the vibration frequency received by the tuning fork when the sensor is inserted into the medium. The sensor is equipped with a built-in temperature sensor to provide temperature compensation.
harmonyRosemount densitometerWorking principle
The tuning fork densitometer sensor is designed based on the principle of component vibration, which is similar to a two toothed tuning fork. The fork body vibrates due to a piezoelectric crystal located at the root of the tooth, and the frequency of the vibration is detected by another piezoelectric crystal. Through phase shifting and amplification circuits, the fork body is stabilized at its natural resonant frequency. When the medium flows through the fork, the change in the mass of the medium causes a change in the resonant frequency.
The density and vibration frequency of the medium follow the following mathematical formula:
D=K0+K1T+K2T2
In the formula: D=density of the measured medium
T=natural frequency of fork body
T2=frequency of the measured medium flowing through the fork
K0, K1, K2=constants
According to this formula, the accurate medium density value can be calculated through an electronic processing unit.
Technical Features
The tuning fork vibration densitometer is equipped with an electronic conversion device based on a microprocessor, which integrates signal processing, calculation, and diagnostic functions. In addition to its convincing measurement accuracy and reliability, it can communicate directly with PCs through RS485 interface. In the ADView software environment, users can directly configure online nodes, diagnose faults, and record data. While measuring density and temperature, parameters such as basic density, ° API, Brix content, concentration percentage, mass percentage, volume percentage, and specific gravity can also be calculated. The tuning fork densitometer can be directly installed on storage tanks and pipelines, and its measured fluid viscosity can reach up to 20000 cP, which is a significant feature that sets it apart from other similar products, and it also has a high cost performance ratio.
technical parameters
Measurement range: 0.5-2.5 g/cc (500-2500 kg/m3)
Calibration range: 0.5-2.5 g/cc (500-2500 kg/m3)
Measurement accuracy: ± 0.002 g/cc (± 2 kg/m3)
Repeatability: ± 0.0002 g/cc (± 0.2 kg/m3)
Operating temperature range: -50 ℃~+200 ℃
Maximum working pressure: 207 bar (3000psi)
Fluid viscosity range: 0-20000 cP
Temperature coefficient: less than 0.1 kg/m3/℃ (corrected)
Pressure impact: negligible
Built in temperature sensor: PT100
Liquid receiving material: 316L stainless steel Hastelloy alloy
Fork body coating: standard type, PTFE or electrolytic polishing
Power supply: 24VDC, ≥ 50 mA
Analog signal output: 4-20 mA, 0-1000Hz, RS485 Modbus RTU
Output accuracy (20 ℃): ± 0.1% or ± 0.05% FS of the reading
Output repeatability (-40~+85 ℃): ± 0.05% FS
Process connection: ANSI 150~1500 RF, DIN 50 PN16, DIN 50PN40, IDF and RJT sanitary types
Protection level: IP65
Shell: Aluminum alloy
Industry of use
Typical industries include the petrochemical industry, brewing industry, food industry, pharmaceutical industry, and mineral processing (such as clay, carbonate, silicate, etc.), which are specifically used for interface detection in multi product pipelines, density detection of mixed mixtures, monitoring of reactor endpoints, and interface detection of separators in the above industries.
