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Densimeters PLOT-3
 Densimeter PLOT-3 is designed for automatic measurement of density of liquids with a maximum kinematic viscosity up to 200 mm2/s (200 cSt) in a range of temperatures from minus 40 to plus 85°С and transferring of measured values at a request to a controller of the measuring system or a personal computer through an interface “current loop” (RS-232, RS-485 using with adapters AD-1, AD-2).
Area of applicationIn the structure of automated accounting systems of clean homogeneous liquids in reservoirs at storage depots, where periodical distant measurement of density, temperature and kinematic viscosity of a liquid is requires, including reservoirs at petrol stations and petrol storage depots, at establishments of food and chemical industry.
Type of explosionproof - explosion-impermeable enclosure and spark-safe electrical circuit (IExibdllВТ5 together with a spark protection barrier "Bastion"). Principle of operation - vibratory: vibration frequency of the sensing element that is submersed into a liquid is functionally related with a density of the liquid, and quality factor of a vibrating system – with kinematic viscosity. As a thermometer serves a built-in standard platinum impedance transformer. Processing of data is made by a microcontroller of MCS-51 family of AT89C52 type.
Precision characteristics
| Maximum permissible relative error at measuring of density |
±(0,035, 0,05, 0,1)% |
| Maximum permissible absolute error at measuring of temperature |
±0,3°С |
| Maximum permissible absolute error at measuring of kinematic viscosity |
±(0,4+0,04*v)mm2 /s, where v – value of kinematic viscosity, mm 2 /s |
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Submersible densimeter PLOT-3B
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| Flow densimeter PLOT-3M |
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Technical characteristics
- Operating environment - clean homogeneous liquids with a kinematic viscosity 100 mm2/s (100 cSt) - stock-tank oil and products of its processing, alcohols, liquefied hydrocarbon gas, solvents and other liquids that are unaggressive to alloys 45НХТ, 12Х18Н9Т, 12Х18Н10Т.
- Flow variant of the densimeter (PLOT-3-25, PLOT-3I-25) is designed for operation at liquid pressure up to 2,5 MPa (25 kilogram-force /sm2) and a peak flow 1,5m3/h.
- Range of measured densities ......... from 420 to 1600 kg/m3.
- Range of measured temperatures .......... from minus 40 to plus 85°C.
- Range of measured viscosities ..........from 1,5 to 200 mm2/s (cSt).
- PLOT-3 is charged from a DC source, installed outside the explosion hazard zone, through a spark protection barrier "Bastion" at voltage at the input of densimeter from 6,5 to 15 V, current consumption not more than 20 mA.
- PLOT-3 receives control commands and transmits measured densities, temperatures and viscosities of the liquid through a channel of serial exchange of “current loop” type in the form of current pulses with a level of logical "1" from 5 to 20 mA and logical "0" from 0 to 0,1 mA with a transfer speed of 2400 bits/s.
- Minimal overall dimensions and mass, four-wire link up to 2000 m length, low power consumption, modern elementary base. Calibration interval of PLOT-3 - 2 years.
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Portable densimeter PLOT-3B-1R |
Portable densimeter PLOT-3B-1R
Portable densimeter PLOT-3B-1R is designed for measurement of density and temperature of a liquid in reservoir (up to 25 m height), without collection of samples: reservoirs, tankers, rail tank cars, petrol stations reservoirs, tank trucks.
Allows to economize time at measurements, lower measurements errors that arise at sampling – this gives significant advantages at calculation of commodity mass of petrol and petroleum products.
Submersible sensor gives a possibility to continuously measure density and temperature of the liquid at various levels. Densimeter is compact, light-weight and convenient in operation.
Assignment Petrochemical industry:
- manufacture and processing;
- transportation and storage;
- acceptance and shipment of oil and petroleum products.
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Parameter name
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Types of portable densimeters
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Densimeter type
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PLOT-3B-1R
Submersible on a rope
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PLOT -3B-1
Submersible on a hose
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PLOT -3B-1M
Compact
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| Submersion depth |
up to 25 m
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up to 10 m
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up to 2 m
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| Range of density measurement |
from 680 to 1600 kg/m3
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| Range of temperature measurement |
from minus 40 to plus 85 °C
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| Range of viscosity measurement |
from 1,5 to 200 mm2 /s (cSt)
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| Measurement error |
• density: up to ±0,3 kg/m3
• temperature: up to ±0,3 °C
• viscosity: up to ±(0,4+0,04v) mm2/s, where v – value of kinematic viscosity, mm2/s |
• density: up to ±0,5 kg/m3
• temperature: up to ±0,3 °C
• viscosity: up ±(0,4+0,04v) mm2/s, where v – value of kinematic viscosity, mm2/s |
| Power supply |
Autonomous from a built-in battery
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| Explosion-proof |
spark-safe circuit
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