RBDM Fork Insertion liquid Density Meter(Densitometers) is based on the proven tuning fork technology. It is an all-welded sensor that is designed for insertion into a pipeline, open tank, or closed tank.
Fluid density is determined directly from the resonant frequency of the tuning fork immersed in the fluid. A temperature sensor is also fitted within the transmitter to indicate the operating temperature.
Plug-and-play density analysis. The RB Insertion Tuning Fork Density Meter is designed for high-accuracy, continuous density measurement in pipelines, bypass loops, and tanks. Based on the vibration principle, it provides instantaneous readings of density, Brix, and concentration without the need for bypass lines or sampling. Its rugged, all-welded construction ensures long-term stability in demanding chemical, petroleum, and food processing environments.
Specifications:
• Density Range: (Customizable).
• Accuracy: or .
• Repeatability: .
• Operating Temp: .
• Max Pressure: Up to (Flange dependent).
• Output: 4-20mA (HART), RS485 (Modbus).
• Wetted Parts: Stainless Steel 316L, Hastelloy, or PTFE coating for acid/alkali.
Key Advantages:
• Simplified Installation: Direct insertion via flange or thread—no maintenance-heavy bypass required.
• Insensitive to Conditions: Unaffected by pressure, temperature, or flow rate fluctuations.
• Versatile Media: Excels in measuring slurries, high-viscosity liquids, and corrosive chemical mixtures.
• Dual Output: Simultaneously monitors temperature and density for automatic thermal compensation.
Need to measure both mass flow and density? Check our Coriolis Mass Flow Meter Series.
For non-invasive liquid level detection, see our Ultrasonic Sensors.
RBDM Insertion Density Meter operates on the vibrating element principle, the element in this case being a tuning fork structure that is immersed in the liquid being measured. The tuning fork is excited into oscillation by a piezoelectric device internally, secured at the root of one tine. The frequency of vibration is detected by a second piezoelectric device, which is secured in the root of the other tine.
The meter sensor is maintained at its natural resonant frequency, as modified by the surrounding liquid, by an amplifier circuit located in the electronic housing. This frequency of vibration is a function of the overall mass of the tine element and the density of the liquid in contact with it. As the density of the liquid changes, the overall vibrating mass changes, and therefore the resonant frequency changes.
By measuring this frequency and applying the following equation, the density of the liquid can be calculated.
ρ = K0 + K1τ + K2τ2
Where:
• ρ = Fluid uncorrected density (kg/m3)
• τ = Time period of meter (μs)
• K0, K1, K2 = meter calibration coefficients
RBDM Fork Insertion Density Meter Features:
RBDM Fork Insertion Density Meter Specifications
|
Density range |
0.5 – 2.5 g /cc (500 – 2500 kg/m3) |
|
Calibration range |
0.8 – 1.2 g /cc (800 – 1200 kg/m3) |
|
Accuracy |
± 0.002 g /cc (± 2 kg/m3);± 0.001 g /cc (± 1 kg/m3) |
|
Repeatability |
± 0.0002 g /cc (± 0.2 kg/m3) |
|
Temperature range (Process) |
-20 ~ +150 Degree Celsius (℃) |
|
Pressure rating |
10MPa ~ 20MPa |
|
Viscosity range |
0 – 20000 cP |
|
Temperature effect |
Less than 0.1 kg/m3/℃ (After Calibration) |
|
Impact from pressure |
Negligible |
|
Built-in temperature sensor |
PT100 |
|
Wetted parts |
Stainless steel 316L/ HC Hastelloy |
|
Tine finish |
Standard, PFA coated, or Electro-polished |
|
Power supply |
24VDC，≥500 mA |
|
Analog Output |
4 -20 mA，0-1000Hz，RS485 Modbus RTU |
|
Density accuracy - process(20℃) |
± 0.1% or ± 0.05% FS of indicated figures |
|
Repeatability - process(-40 ~85℃) |
± 0.05% FS |
|
Process connection |
ANSI 150 ~ 1500 RF DIN 50 PN16 DIN 50 PN40 IDF and RJT hygienic type |
|
Protection Grade |
IP65 |
|
Outer covering |
Aluminum alloy |
RBDM Liquid Fork Insertion Density Meter Model Selection：
| RBDM Liquid Fork Insertion Density Meter Model Selection | ||||||||||||||||||
| Probe and stem material | ||||||||||||||||||
| 1 | 316LSS | |||||||||||||||||
| 2 | Hastelloy, | |||||||||||||||||
| 3 | High Nickel Alloy | |||||||||||||||||
| 4 | Titanium | |||||||||||||||||
| 5 | Tantalum | |||||||||||||||||
| 6 | Zirconium | |||||||||||||||||
| 7 | C4 steel | |||||||||||||||||
| 8 | Titanium, Tantalum | |||||||||||||||||
| 9 | Copper-nickel alloy | |||||||||||||||||
| 10 | Nickel-based alloy | |||||||||||||||||
| X | Others, inquire | |||||||||||||||||
| Flange material | ||||||||||||||||||
| 1 | The material of the whole flange is the same as the material of the probe rod | |||||||||||||||||
| 2 | The material of the flange bottom surface is the same as the probe rod material | |||||||||||||||||
| 3 | Special Customization | |||||||||||||||||
| Transmitter Housing | ||||||||||||||||||
| A | Cast aluminum + spray | |||||||||||||||||
| B | 316SS | |||||||||||||||||
| C | 316L | |||||||||||||||||
| Power | ||||||||||||||||||
| D | 24VDC/500mA | |||||||||||||||||
| A | 220VAC | |||||||||||||||||
| Pressure Class | ||||||||||||||||||
| 16 | 1.6 MPa | |||||||||||||||||
| 40 | 4.0 MPa | |||||||||||||||||
| XXX | Special: Use this letter to apply for special and mark the pressure level | |||||||||||||||||
| Temperature | ||||||||||||||||||
| 12 | (-20~120℃) | |||||||||||||||||
| 15 | (-50-150℃) | |||||||||||||||||
| S | Special Customization | |||||||||||||||||
| Accuracy Class | ||||||||||||||||||
| 5 | ±0.5kg/m | |||||||||||||||||
| 10 | ±1kg/m | |||||||||||||||||
| 20 | ±2kg/m³ | |||||||||||||||||
| Process Connection | ||||||||||||||||||
| A | HG/T 20592-2009 DN50 RF | |||||||||||||||||
| B | Triclamp | |||||||||||||||||
| C | Thread | |||||||||||||||||
| S | Special Customization | |||||||||||||||||
| Pole Length | ||||||||||||||||||
| 128 | Default length: 128mm | |||||||||||||||||
| XXX | Special: Remark the required length | |||||||||||||||||
| Installation Method | ||||||||||||||||||
| N | No installing reducer pipe | |||||||||||||||||
| A(XX) | Install reducer for horizontal pipeline (XX: user pipe diameter) | |||||||||||||||||
| B(XX) | Install reducer for vertical pipe (XX: user pipe diameter) | |||||||||||||||||
| D | Tank installation | |||||||||||||||||
| Output | ||||||||||||||||||
| A | 4~20mA+0-1KHz+Modbus RTU | |||||||||||||||||
| F | 4~20mA(Hart)+0-1KHz+Modbus RTU 4-20mA+0-1KHz+FF | |||||||||||||||||
| P | 4-20mA+0-1KHz+Profibus PA | |||||||||||||||||
| Calibration Sheet | ||||||||||||||||||
| 1 | Factory Calibration report | |||||||||||||||||
| 2 | Third-party national standard calibration certificate | |||||||||||||||||
| Languange | ||||||||||||||||||
| E | English | |||||||||||||||||
| G | German | |||||||||||||||||
| S | Spanish | |||||||||||||||||
| R | Russian | |||||||||||||||||
| Transmitter Conntection Type | ||||||||||||||||||
| C | Compact | |||||||||||||||||
| R- | Remote | |||||||||||||||||
| XX | Cable Length(m); standard cable is 5m | |||||||||||||||||
| Electrical Interface | ||||||||||||||||||
| 1 | 1/2"NPT(F)×2 | |||||||||||||||||
| S | Customize | |||||||||||||||||
| Ex-proof Class | ||||||||||||||||||
| N | No | |||||||||||||||||
| 6 | Exd II CT6 Gb | |||||||||||||||||
| IP Class | ||||||||||||||||||
| 5 | IP65 | |||||||||||||||||
| 6 | IP66 | |||||||||||||||||
| 7 | IP67 | |||||||||||||||||
| RBDM | 1 | 1 | A | D | 16 | 12 | 5 | A | 128 | N | A | 1 | E | C | 1 | N | 5 | Standard |
RBDM Fork Insertion liquid Density Meter Application
RBDM Insertion Density Meter is ideally suited to applications where continuous, real-time measurement of density is required. As an instance, it can be used in process control where density is the primary control parameter for the end product, or functioning as an indicator of some other quality control parameter such as percent solids, or percent concentration.
RBDM Insertion Density Meter can be applied widely in numerous industries, including brewing, end point detection in batch reactions, evaporator control, petroleum retail outlets, product mixing, slurries, tank and pipe applications, and solvent separation.
Catalog - Insertion type density meter
Manual - Density meter
Other files - Density measurement
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