E+H Proservo NMS83 Servo Tank Gauging Instrument

High-Precision Servo Tank Gauging with Endress+Hauser Proservo NMS83

The Endress+Hauser Proservo NMS83 is an advanced servo-driven level transmitter engineered for high-precision liquid level measurement, interface detection, and density profiling in hygienic storage tanks and process vessels. Specifically optimized for the food and beverage industry, wine/spirits production, pharmaceutical storage, and fine chemical applications, the NMS83 delivers certified custody transfer accuracy, rigorous inventory management, and reliable loss control.

Advanced Servo Buoyancy Measurement Principle

The Proservo NMS83 operates on a proven servo-buoyancy measuring principle. A precision displacer is lowered into the liquid via a measuring wire connected to a stepper motor. When the displacer touches the liquid surface, its weight decreases due to buoyancy. This change in wire tension is precisely detected by a magnetic coupling monitored by Hall sensors. Because the measurement relies strictly on mechanical buoyancy forces, it remains completely unaffected by changing medium properties such as conductivity, dielectric constant, or vapor pressure.

Key Performance Features & Technical Advantages

• Exceptional Custody Transfer Accuracy: Delivers industry-leading measurement precision up to ±0.4 mm (±0.02 in) for strict inventory accounting and fiscal metering.

• Multi-Layer Interface & Density Profiling: Capable of measuring liquid levels, interfaces between up to three liquid phases, tank bottom detection, spot density, and full density profiles.

• Hygienic Design & Wetted Materials: Features high-grade polished 316L stainless steel, Alloy C276, and PTFE wetted parts, meeting strict hygienic standards and supporting Clean-In-Place (CIP) cleaning procedures.

• Extreme Temperature & Pressure Range: Withstands extreme process temperatures from -200 °C to +200 °C (-328 °F to +392 °F) and absolute operating pressures up to 6 bar (87 psi).

• Flexible Fieldbus Integration: Supports open communication protocols including Modbus RS485, V1, WM550, HART, and analog 4–20 mA outputs for seamless connection to DCS and inventory management systems.

• Global Safety & Metrology Approvals: Fully certified for international hazardous areas (ATEX, FM, IECEx, NEPSI), overfill protection (WHG, SIL), and custody transfer regulatory standards (OIML, NMi, PTB).

Optimized Total Cost of Ownership & Safe Operation

The NMS83 is engineered for simplified mechanical installation and trouble-free maintenance. Optional accessories such as weather protection covers, pressure gauges, gas purging nozzles, and CIP relief valves ensure that the instrument adapts seamlessly to complex sanitary tank installations while guaranteeing maximum operational safety.

 Applications

• Food, Beverage & Hygienic Processing: High-accuracy storage and inventory monitoring for milk, beer, wine, whiskey, sake, and liquid food ingredients.

• Pharmaceutical & Fine Chemicals: Hygienic storage vessels, solvent tanks, and high-purity liquid intermediate silos.

• Petrochemical & Chemical Terminals: Custody transfer measurement for high-value chemical liquids requiring strict loss control.

• Tank Farm Inventory Management: Centralized level monitoring, interface layer tracking, and multi-point density logging in industrial storage parks.

Technical Specifications

Parameter / Feature	Specification Details
Measuring Principle	Servo / Float Tank Gauging (Buoyancy method)
Application / Speciality	High-precision level, interface, spot density, and density profile in hygienic tanks
Measuring Range	Up to 22 m (72 ft)
Reference Accuracy	Up to ±0.4 mm (±0.02 in)
Process Temperature	-200 °C to +200 °C (-328 °F to +392 °F)
Process Pressure Absolute	Up to 6 bar abs. (87 psi)
Main Wetted Parts	316L Stainless Steel (polished), Alloy C276, PTFE
Process Connections	Flanges (DN80 / 3″ to DN150 / 6″)
Supply Voltage	85 to 264 VAC, 52 to 74 VAC, or 19 to 64 VDC
Communication Protocols	Modbus RS485, V1, WM550, HART, 4–20 mA analog output/input
Ambient Temperature	Standard: -40 °C to +60 °C (-40 °F to +140 °F)
Safety & Overfill Approvals	WHG Overfill Prevention, SIL safety compliance
Custody Transfer Approvals	OIML, NMi, PTB regulatory metrology standards
Hazardous Area Approvals	ATEX, FM, IECEx, NEPSI, EAC

FAQ 

Q1: What is the primary measuring principle of the Proservo NMS83?

Answer: The NMS83 operates on a servo-buoyancy principle where a precision displacer is lowered into the liquid by a motor-driven wire, detecting buoyancy torque changes via magnetic Hall sensors.

Q2: Is the NMS83 suitable for custody transfer and fiscal metering?

Answer: Yes, the NMS83 achieves high-precision accuracy up to ±0.4 mm and carries international custody transfer approvals including OIML, NMi, and PTB.

Q3: Can the NMS83 measure phase interfaces and density?

Answer: Yes, it supports measurement of interfaces between up to three liquid layers as well as spot density and profile density logging.

Q4: What process connections and wetted materials are available?

Answer: The NMS83 features DN80/DN150 flange connections with polished 316L stainless steel, Alloy C276, and PTFE wetted parts optimized for hygienic environments.

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