Description
Russian manufacturer AO NPK VIP presents specialized compact corrosion-resistant SDV hydrostatic pressure transmitters with an “open diaphragm” of 20 and 34 mm diameter. Submersible level transmitters are used with liquid, viscous, and aggressive media. The enlarged diaphragm area of the measuring unit enables operation with media containing large particles.
A 50 mm diameter version is available on request.
The hydrostatic pressure transmitter is designed for operation with liquids (including oil, diesel fuel, fuel oil, kerosene, gasoline), steam, gases, steam-gas and gas mixtures (including gaseous oxygen and oxygen-containing mixtures) at pressures up to 100 MPa.
Transmitters are intended for operation at atmospheric pressure from 66 to 106.7 kPa (495–800 mmHg) and correspond to mechanical stress resistance group P2 per GOST R 52931.
Applications
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Oil and gas industry
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Power engineering
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Water utilities
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Measuring equipment
AO NPK VIP transmitters are used in metrological services accredited for verification and calibration of pressure measuring instruments, as well as in automatic control systems for regulation and control of technological processes at gas, metallurgical, chemical, and food enterprises.
Advantages and Features
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High-stability sensors
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High measurement accuracy
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Reliability (Time between verifications (MTBV) – 5 years)
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Output interfaces: 4–20 mA, 0.4–5.5 V, RS485, CAN
Operating Principle of Hydrostatic Pressure Measurement
The operating principle of a submersible hydrostatic level transmitter is based on measuring the pressure of the liquid column on the sensitive diaphragm.
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Pressure perception: When liquid exerts pressure on the measuring unit, the diaphragm deforms, changing the electrical resistance of the tenzo-resistors.
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Pressure conversion: Deformation of the sensing element leads to changes in the transmitter’s electrical characteristics, which are then converted into a current output electrical signal.
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Signal processing: The signal is processed by the electronics signal processing unit (including possible amplification), and converted into digital form for further processing and display.
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Display or data transfer: The processed signal can be displayed locally or transmitted to a monitoring or control system.
Also available are SDV-SPECIAL intelligent hydrostatic pressure transmitters with a submersible cable (non-intrusive installation), used for measuring liquid column height in open reservoirs, tanks, vessels, wells, etc.
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Measurement range: 1–200 m H₂O
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Output signals: 4–20 mA; 0.4–5.5 V; 0.4–2.0 V; RS485; 1WIRE; CAN
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Probe diameters: Ø34 mm; Ø20 and Ø50 mm with open diaphragm
Characteristics
| Ambient Temperature, °C | –50 … +80 |
| Dust and Moisture Protection Class | IP54; IP65; IP67; IP68 |
| Electrical Connector | DIN 43650; 2RM 18; cable entry |
| Explosion-Proof Design | intrinsically safe electrical circuit 0ExiaIICT5X, Mining version ROExiaIMaX |
| Group for Resistance to Mechanical Impacts (per GOST R 52931) | V2 |
| Housing Materials | stainless steel 12X18H10T |
| Indication and Configuration | IK 4-20M communicator for 4–20 mA transmitters; for digital transmitters – via interface |
| Mass, kg, Not Exceeding | 0,55 |
| Materials in Contact with Measured Medium | steel 36NKhTYu, stainless steel 12X18H10T |
| Measured Medium Temperature, °C | –50 … +80 |
| Nominal Power Supply Voltage, V | 24/15/12/3,6/12 |
| Power Supply Voltage Range, V | 12–36 / 12–24 / 8–30 / 3.0–3.9 / 8–30 |
| Process Connection | М36×1,5; М20×1,5 |
| Temperature Error, % per 10 °C | 0.15 / 0.15 / 0.10 / 0.15 / 0.10 |
| Error, % of Measurement Range | ±0,10; ±0,15; ±0,25; ± 0,5; ±1 |
| Input Signal/Power Supply | 4–20 mA, 0.4–5.5 V, RS485, CAN, 1WIRE |
| Calibration Interval | 5 years |
| Warranty Period | 3 years |
| Gauge Pressure (GP) | 10 kPa – 25 MPa |