The core working principle of the coal washing online density meter is based on the formula P=ρ gh for liquid static pressure difference. There are two pressure sensors (or pressure relays) inside the instrument, which are installed at a fixed vertical distance (h). The sensor measures the pressure difference (Δ P) generated by the liquid column, and with the known local gravity acceleration (g) and height (h), the density (ρ) of the liquid can be calculated. To ensure accuracy, devices usually have built-in temperature sensors (such as PT1000) that automatically compensate for changes in medium temperature.
Liquid Industry Online Density MeterOverview
Intelligent online density meter(Also known as online density transmitter)It is a device used for continuous online measurement of liquid concentration and density,Can be directly used in industrial production processes.JThe intelligent online density meter adopts the principle of differential pressure density meter, which can calculate the differential pressure value of the medium at a certain vertical distance
Output density value,And automatically perform temperature compensation,high precision,Good reliability,Easy to install and use.
For a two-wire density transmitter,Mainly used for industrial process control,The online density meter generates corresponding values based on the concentration and density4-20mAsignal,Remote calibration and monitoring can be achieved through digital communication.
technical indicators
1, lose exit:4-20mAcurrent output,Overlay digital signals(HARTagreement)
2, Precision degree:0.001g/cm3
3Density range:0-2g/cm3 ; 0-3g/cm3
4Instrument power supply:16-30VDCpower supply,*Use24VDC
5, divided distinguish rate:0.001g/cm3
6Temperature range:0-100℃ temperature accuracy:0.2℃
7Environmental temperature:-10~60℃
8Humidity range:0-90%
Installation Instructions
1、 The principle of online density meter is based on the double flange differential pressure method based on static pressure. Due to the fact that the measured liquid is sometimes not stationary,It is constantly circulating and stirring. Therefore, devices that use the principle of static pressure to test density must overcome these effects. Additional auxiliary testing tanks should be added in areas where direct measurement is not suitable,Make the densitometer work in a location with minimal flow rate and fluctuations,To ensure the stability of the density meter reading.
2、 The specific installation diagram is designed and determined by the on-site technical personnel based on the size of the purchased equipment.
3、 For testing flowing liquids or liquids with high vibration, auxiliary measuring tanks should be installed,The purpose is to stabilize the measurement readings. On site operators need to balance dynamic and reading stability requirements when adjusting the liquid flow rate inside the measuring tank.
4、 The on-site installation of density meters must ensure that two pressure relays are on the same vertical plane,Otherwise, measurement errors may occur.
5、 The liquid being measured on site must be kept below two measuring sensors
6、 Density meters can theoretically measure concentrations based on different media,Please calculate the concentration result based on the on-site situation by the user.
Precautions for online density meter
1.Is the tested solution in the tank or in the pipeline?The maximum pressure between the two is not greater than5MPa.
2.If the tested solution is in a pipeline,The flow rate of the solution is not greater than0.4meters per second.
3.The diameter of the pipeline should not be less thanDN80.
4.The flow rate of the tested solution per hour shall not exceed26cubic per hour.
5.If the tested object is in the tank,Customers need to bring their own protective cover.
6.Measurement range and accuracy?
1. Scope of application
The KDM280 plug-in tuning fork densitometer can perform real-time online density detection. It can be applied to density based parameters
Product Process ControlOr in quality control based on solid percentage or concentration percentage. 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.
2. Characteristics
KDM280 plug-in typetuning fork density meterEquipped with a microprocessor, the sensor can perform complete signal conditioning, calculation, and diagnosis
Function, no need for remote electronic devices for processing.
3. Parameters
Density measurement range ：0.5 – 2.5 g /cc (500 – 2500 kg/m3)
Calibration range ：0.8 – 1.2 g /cc (800 – 1200 kg/m3)
measurement accuracy ：± 0.001 g /cc (± 1 kg/m3 )/± 0.002 g /cc (± 2 kg/m3 )
repetitiveness ：± 0.0002 g /cc (± 0.2 kg/m3)
Temperature output range ：-20℃ ~ +150℃
*Work pressure ：10MPa Special 20MPa
Fluid viscosity range ：0 – 20000 cP
temperature coefficient : Less than 0.1 kg/m3/℃ (after calibration)
Pressure impact : Negligible
Built in temperature sensor PT100
wetted material ：316L stainless steel Hastelloy alloy
Fork body coating : Standard type,PTFE or electrolytic polishing
power supply ：24VDC，≥500mA
Analog signal output ：4 -20 mA，0-1000Hz，RS485 Modbus RTU
output accuracy(20 ℃): ± 0.1% or ± 0.05% FS of reading
Output repeatability(-40 ~ +85℃) ：± 0.05% FS
process connection ANSI 150 ~ 1500 RF DIN 50 PN16 DIN 50 PN40
4. Install piping
to ensureKDM280tuning fork density meterCapable of accurate measurement and stable display, with the measured medium flow rate not exceeding 1 m/sAnd install a density meter The diameter of the pipeline must be greater than or equal to 159mm,The location for installing the density meter should be as far away from the pump as possible, with a distance of * 5m ;When the flow rate greater than 1 m/stimeAdopting an expanded diameter installation, with each increase in flow rate 1m,Expansion of pipeline diameter for installing density meter 1.5 Double,In front of the instrument Need to have≥ 600mmThe straight section of the instrument needs to have≥ 300mmThe straight pipe section ensures that the fluid is in a layer when flowing through the fork Flow state,
5. Precautions
Prohibited Directly drop the instrument
Prohibited Measure highly corrosive liquids, and if necessary, specify the instrument material when placing an order
Prohibited The instrument operates above rated pressure
Prohibited Stress testing exceeds the testing pressure
notice The instrument is suitable for explosion-proof applications
notice After installation, the instrument can withstand testing and working pressure 1.2 times
notice Use original bags and suitcases for storing and transporting instruments
notice When placing an order, be sure to inform the actual installation method on site, otherwise it may cause usage errors on site
