Technical Data
CompareContinuous / Liquids
| Measuring Principle | Servo / Float Tank Gauging |
| Characteristic / Application | Servo Tank Gauging: High precision measurement for liquid level, interface, spot density, profile density |
| Specialities | Custody transfer level measurement Interface measurement Spot density, density profile measurement |
| Supply / Communication | 85-264VAC 52-74VAC 19-64VDC |
| Accuracy | up to 0.4 mm |
| Ambient temperature | Standard: -40°C…60°C (-40°F...140°F) For calibration to regulatory Standards: -25°C…55°C (-13°F...131°F) |
| Process temperature | -200°C...200°C (-328°F...392°F) |
| Process pressure / max. overpressure limit | up to 25 bar (363 psi) abs |
| Main wetted parts | 316L, AlloyC276, PTFE |
| Process connection | Flange: DN80/3" / DN100/4" / DN150/6" |
| Max. measurement distance | 55 m (180 ft) |
| Communication | Outputs: Fieldbus: Modbus RS485, V1, WM550 HART, BPM and TRL/2 (via GE option) Analog 4-20mA output (Exi/ Exd) Relay output (Exd) Inputs: Analog 4-20mA input (Exi/ Exd) 2-, 3-, 4-wire RTD input Discrete input (Exd, passive/ active) |
| Certificates / Approvals | ATEX, FM, IEC Ex, EAC, JPN Ex, KC Ex, INMETRO, NEPSI |
| Safety approvals | Overfill protection WHG SIL |
| Design approvals | EN 10204-3.1 NACE MR0175, MR0103 |
| Metrological approvals and certificates | OIML, NMi, PTB, LNE Calibration performed on accredited calibration facilities (acc.to ISO/IEC 17025) |
| Options | Redundant fieldbus Alu-coated or 316L housing Weather protection cover Guide wire assembly Relief valve Gas purging nozzle connection Pressure gauge Cleaning nozzle connection |
| Application limits | Stilling well or guide wires for turbulent application Recommend PTFE displacer for high viscosity application Recommend AlloyC276 displacer for corrosive application Interface measurement requires min. difference of 0.100 g/ml between layers |
Density
| Measuring Principle | Servo / Float Tank Gauging |
| Characteristic / Application | Servo Tank Gauging: High precision measurement for liquid level, interface, spot density, profile density |
| Supply / Communication | 85-264 VAC |
| Ambient temperature | Standard: -40°C…60°C 40°F...140°F) For calibration to regulatory Standards: -25°C…55°C (-13°F...131°F) |
| Process temperature | -200°C...200°C (-328°F...392°F) |
| Process pressure | up to 25 bar (363 psi) abs |
| Wetted parts | 316L, AlloyC276, PTFE |
| Output | Fieldbus: Modbus RS485, V1, HART Analog 4-20mA output (Exi/ Exd) Relay output (Exd) Inputs: Analog 4-20mA input (Exi/ Exd) 2-, 3-, 4-wire RTD input Discrete input (Exd, passive/ active) |
| Certificates / Approvals | ATEX, FM, IEC Ex, NEPSI, EAC |
| Options | Redundant fieldbus Alu-coated or 316L housing Weather protection cover Guide wire assembly Relief valve Gas purging nozzle connection Pressure gauge Cleaning nozzle connection |
| Specialities | Custody transfer level measurement Interface measurement Spot density, density profile measurement |
| Measuring range | 47 m (154 ft) |
| Other approvals and certificates | OIML, NMi, PTB |
The Proservo NMS81 intelligent tank gauge is designed for high-precision level measurement in custody transfer and inventory control applications, and is certified by NMi and PTB. It complies with the relevant requirements of OIML R85 and API 3.1B standards. It satisfies the strict requirements of tank farm inventory management and loss control, and has been optimized for total cost savings and safe operation.
Advantages
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Hardware and software design complies with IEC 61508, with maximum safety SIL3 (in homogeneous redundant systems)
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Maximum measuring accuracy of ±0.4 mm (± 0.02"), resulting in maximum reliability
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Design complies with international metrology regulations such as OIML R85 and API MPMS standards
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Local and national approvals, such as NMi or PTB approval for custody transfer applications
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Wetted parts in 316L with strong corrosion resistance, suitable for acidic applications such as crude oil
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Measurement of up to three interfaces, tank bottom, single-point temperature and density profile
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Ideal for LNG/LPG applications, unaffected by dc value or Boil Off Gas
Application areas
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High-precision custody transfer measurement of crude oil, gasoline, diesel, petroleum and chemicals.
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Process connection: flange
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Temperature: -200...+200°C (-328...+392°F)
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Pressure: 0...+25 bar (0...+362 psi)
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Measuring range: Max. 47 m (154 ft)
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Measuring accuracy: ±0.4 mm (±0.02")
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International explosion protection and custody transfer approvals, WHG overfill protection and SIL approval
Accessories / Spare parts
Source:Endress+Hauserpublic information from the website
Spare Parts & Accessories 36
36 spare parts · click to collapse
| Order code | Description | |
|---|---|---|
| 71273750 | Hub cavity housingDrum housing cover made of 316L. Usage: Proservo NMS81. | Details |
| 71273751 | calibration chamber housingCalibration window cover made of 316L including glass and holder. Usage: Proservo NMS81. | Details |
| 71273688 | Cable, main board to electronic componentsCable to connect platform mainboard to Proservo electronics. Usage: Proservo NMS80/81/83. | Details |
| XPN0031- | I/O moduleUsage: NRF81, NMR81/NMR84, NMS80/NMS81/NMS83. | Enquire |
| 71273681 | sensing elementFor SW version 01.05 and below only. Usage: Proservo NMS80/81/83. | Details |
| 71726277 | Detection unit, servo level gauge, software version 1.06 and aboveFor SW version 01.06 and above only. Usage: Proservo NMS80, NMS81, NMS83. | Details |
| 71273689 | Sensor module, servo electronics for activating the sensing elementElectronics to set on the detector unit. Usage: Proservo NMS80/81/83. | Details |
| 71319969 | Seal, HNBR, PTFE, FVQM, EPDM, NMS81/83HNBR: back cover, calibration window. FVMQ: display cover. EPDM: goretex filter. Usage: Proservo NMS81/83. | Details |
| 71319974 | Seal, FKM, FVQM, EPDM, NMS81/83FKM: back cover, calibration window. FVMQ: display cover. EPDM: goretex filter. Usage: Proservo NMS81/83. | Details |
| 71319977 | Seal, CR, FVQM, EPDM, NMS81/83CR: back cover, calibration window. FVMQ: display cover. EPDM: goretex filter. Usage: Proservo NMS81/83. | Details |
| 71319980 | Seal, PTFE, FVQM, EPDM, NMS81/83PTFE: back cover, calibration window. FVMQ: display cover. EPDM: goretex filter. Usage: Proservo NMS81/83. | Details |
| 71319987 | Seal, VMQ, FVQM, EPDM, NMS81/83VMQ: back cover, calibration window. FVMQ: display cover. EPDM: goretex filter. Usage: Proservo NMS81/83. | Details |
| 71273693 | Hub BracketWire drum bracket made of 316L. Usage: Proservo NMS81. | Details |
| 71273744 | guide coilWire ring made of 316L to connect measuring wire with displacer. Usage: Proservo NMS80/81. | Details |
| 017800-0243 | Wire ring, Alloy CWire ring made of AlloyC to connect measuring wire with displacer. Usage: NMS5/NMS7, NMS80/NMS81/NMS83. | Details |
| 71663875 | Wire ring, Alloy CWire ring made of AlloyC to connect measuring wire with displacer. Usage: NMS5/NMS7, NMS80/NMS81/NMS83. | Details |
| 71273746 | guide coilWire ring made of PTFE to connect measuring wire with displacer. Usage: NMS80/81/83, NMS5/NMS7, TGM5. | Details |
| 71273739 | Bearing, hub bracketBearing to support wire drum bracket made of PTFE. Usage: Proservo NMS80/81/83. | Details |
| 71273740 | measuring leadMeasuring wire and ring made of 316L. 0.15mm diameter with 60m length. Usage: Proservo NMS80/81. | Details |
| 71273742 | measuring leadMeasuring wire and ring made of AlloyC 0.2mm diameter with 22m length. Usage: Proservo NMS80/81/83. | Details |
Configurator / Comparison
Case Studies
Municipal Wastewater Treatment · tank farm — Application Case
Application Context
the inlet, biological and outlet stages of a municipal plant is a typical Municipal Wastewater Treatment duty. The project started from tank farm, focusing on centralised level and inventory gauging across a tank farm.
Process Constraints
effluent parameters drift and probes foul with sludge and biofilm, and high solids and corrosive fractions, with large diurnal flow swings only amplify it. The tank farm specification must therefore cover choosing the gauging method by tank size, medium and safety class, then networking them together.
Delivery Approach
Delivery was handled as the level range — level solution matched to the actual tank and silo geometry. Execution centred on choosing the gauging method by tank size, medium and safety class, then networking them together, together with stable compliance with Grade 1A discharge limits and online data reporting.
Field Results
Operation shows the benefit clearly — real-time inventory, making stocktaking and loss accounting more accurate, with confidence in this measuring point improving markedly.
Food & Beverage · tank farm — Application Case
Customer Profile
The typical setting in Food & Beverage is dosing, pasteurising, filling and CIP stages. The measuring point is tank farm; the focus is centralised level and inventory gauging across a tank farm.
Key Difficulties
Conditions are syrups, dairy and beverages that scale easily, under strict hygienic requirements and, on top of that, frequent cleaning demands instruments that withstand hot CIP/SIP caustic cycles, which a standard configuration cannot handle for long. The design therefore starts with choosing the gauging method by tank size, medium and safety class, then networking them together.
Implementation
The scope ran through the level range: level solution matched to the actual tank and silo geometry. Technically it hinges on choosing the gauging method by tank size, medium and safety class, then networking them together, and on these requirements: food-safety and hygienic design per 3-A / EHEDG.
Customer Benefit
In practice this means real-time inventory, making stocktaking and loss accounting more accurate, which cut the workload on the site maintenance team.
Chemical & Pharmaceutical · tank farm — Application Case
Project Background
The project covers reactors, metering vessels and finished-product tanks. The work centres on tank farm and the core task is centralised level and inventory gauging across a tank farm.
Operating Challenges
The medium and duty are characterised by highly corrosive media with solvents and crystallisation, partly in explosive atmospheres, and corrosion plus Ex protection shortens instrument life and makes downtime costly. So tank farm cannot be specified generically — it calls for choosing the gauging method by tank size, medium and safety class, then networking them together.
Solution
The Ainstru engineering team worked through the level range: level solution matched to the actual tank and silo geometry. The configuration involves choosing the gauging method by tank size, medium and safety class, then networking them together, with these requirements in view: Ex certification and GMP traceability of records.
Results
Since start-up the system has run steadily; the practical result is real-time inventory, making stocktaking and loss accounting more accurate.
Power & Energy · tank farm — Application Case
Project Overview
The site is boiler feedwater, turbine condensate and FGD/DeNOx systems. The customer wanted tank farm properly configured on the existing plant, with the aim of centralised level and inventory gauging across a tank farm.
Technical Challenges
What actually causes trouble is high temperature and pressure with both steam and saline water, and drift under high temperature and pressure, with very costly unplanned outages. All of this means the tank farm configuration has to involve choosing the gauging method by tank size, medium and safety class, then networking them together.
Configuration
Supply and installation were organised through the level range: level solution matched to the actual tank and silo geometry. On site this meant choosing the gauging method by tank size, medium and safety class, then networking them together, checked line by line against: compliance with power-industry codes and unit availability targets.
Performance
After commissioning the outcome is real-time inventory, making stocktaking and loss accounting more accurate, and the readings are now used for process tuning.
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