RBDM Insertion liquid Density Meter 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.
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 Insertion Density Meter Features:
RBDM 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 Insertion liquid Density Meter Model selection
Code |
production |
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RBDM-CR |
RBDM-CR Liquid Insertion Density Meter |
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code |
Material |
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A |
316 Stainless Steel Standard |
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B |
HC Hastelloy Standard |
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P |
316 Stainless Steel( Four Fluorine Coating) |
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E |
Requested preference:Please inform for particular requirement |
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code |
Transmission output |
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C |
4-20mA 0-1000Hz RS485 Modbus RTU |
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code |
Transmission device cover case |
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B |
Aluminum alloy |
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code |
Connection process |
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16 |
50mmGB/T 9123.1-2000 RF DN50/PN16 |
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40 |
50mmGB/T 9123.1-2000 RF DN50/PN40 |
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XX |
Requested preference:Please inform for particular requirement |
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code |
length |
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128 |
Standard length 128mm |
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XXX |
User length |
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Code |
Marked edge |
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A |
Pipeline Insertion |
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B |
Tank Insertion |
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C |
Offer Horizontal Variable Installation Pipe |
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D |
Please inform for particular requirement |
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code |
Original setting |
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G |
Options for original setting |
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RBDM-CR |
A |
C |
B |
40 |
128 |
A |
G |
Typical module selection |
Remark: 1. Ex-proof design;
2. 24VDC power supply;
RBDM 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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