Name: Proservo NMS81
Brand: Endress+Hauser
Availability: InStock

Servo tank gauging instrument Proservo NMS81

High precision servo measurement for liquid level, interface and density

Proservo NMS81 - Tank gauging instrument

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Servo tank gauging instrument Proservo NMS81

High precision servo measurement for liquid level, interface and density

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Benefits

Hardware and software developed according to IEC 61508 up to SIL3 (in homogeneous redundancy) for high level of safety
Maximum reliability through accuracy up to ±0.4mm (± 0.02")
Developed according to international metrology recommendations such as OIML R85 and API MPMS
Local and country-specific certifications like NMi or PTB for custody transfer applications
Superior corrosion resistance with 316L materials in the process compatible with sour applications such as crude oil
Measurement of interfaces between up to three liquid layers, tank bottom, spot, and profile densities
Best fit for LNG/LPG applications without influence of dc value or Boil Off Gas

Services and resources

Product Support Product documentation, troubleshooting articles, device details and more.

FLEXible answers to individual needs

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Servo tank gauging instrument Proservo NMS81

Specialized products
Designed for demanding applications

What is FLEX?

FLEX selections

Technical excellence

Simplicity

Fundamental selection Meet your basic measurement needs

Lean selection Handle your core processes easily

Extended selection Optimize your processes with innovative technologies

Xpert selection Master your most challenging applications

Variable

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Manufacturer's warranty

Engineered for confidence

Our instruments are designed for long‑lasting performance, precise measurement, and dependable operation in demanding industrial environments. Each product includes a standard manufacturer’s warranty that reflects our commitment to quality and to the trust you place in our solutions.

Should a warranty case occur, the device will be assessed and the applicable remedy will be provided in line with the warranty terms – helping ensure a reliable and efficient resolution and supporting continued operation of your measurement point.

Request for extended warranty

If you require extended warranty coverage, simply contact your local Endress+Hauser representative. Our experts will advise you on the available options to match your application and risk profile, helping you protect your investment, reduce unexpected repair costs, and ensure reliable long‑term operation beyond the manufacturer's warranty period.

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Warranty terms apply

The manufacturer's warranty and extended warranty are subject to specific conditions. For full details, please refer to the locally applicable General Terms and Conditions (GTC), which can be found on the respective country page of our website.

Services by your side

Right‑first‑time commissioning, worldwide

Endress+Hauser’s qualified service engineers ensure your measurement devices are commissioned right the first time, delivering application‑aligned accuracy, regulatory compliance, and operational confidence from startup onwards, anywhere in the world.

Remote support you can trust wherever you operate

With Endress+Hauser Smart Support, you benefit from faster issue resolution, higher uptime, reliable global expertise across the entire product lifecycle – and lasting peace of mind.

Committed to long‑term, sustainable performance

With deep field expertise, harmonized processes, and continuous monitoring, we accompany you with comprehensive service offerings – from initial start‑up through instrumentation maintenance to process optimization – as a true lifetime partner delivering improved outcomes.

For additional information, please contact your local Endress+Hauser representative.

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24/7 customer portal

Personalized transaction space

Check prices and delivery times, save your favorite products, create quotes and place orders in just a few clicks and track deliveries at any time. With access to your complete order and quote history including all relevant documents you benefit from full transparency throughout the entire process.

Easy access to technical documentation

Select and download all technical documentation such as operating manuals, calibration certificates, approvals and CAD drawings conveniently bundled as a complete documentation package for your entire order or quote.

My Endress+Hauser – all in one place

My Endress+Hauser is your 24/7 connection to Endress+Hauser – in the office, in the field or on the go. It brings together transaction management, documentation and software downloads, knowledge base access, customer support, engineering tools and cloud‑based IIoT services helping you work easier, faster and more efficiently.

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Spare parts and accessories

Cover

Drum Housing Cover, 316L

Cover

Order code 71273750

Drawing number 10

Cover

Calibration window cover, 316L

Cover

Order code 71273751

Drawing number 20

Cable/cable accessories

Cable, mainboard to electronics, Servo

Cable/cable accessories

Order code 71273688

Drawing number 39

I/O module

I/O Module NMR81/84, NRF81, NMS80/81/83

I/O module

Order code XPN0031-

Drawing number 33

Spare parts & accessories

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Tank gauging - Proservo NMS81

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CAD Drawings

Configuration support

Spare parts and accessories

Cover

Drum Housing Cover, 316L

Cover

Order code 71273750

Drawing number 10

Cover

Calibration window cover, 316L

Cover

Order code 71273751

Drawing number 20

Cable/cable accessories

Cable, mainboard to electronics, Servo

Cable/cable accessories

Order code 71273688

Drawing number 39

I/O module

I/O Module NMR81/84, NRF81, NMS80/81/83

I/O module

Order code XPN0031-

Drawing number 33

Spare parts & accessories

Accuracy	up to 0.4 mm
Process temperature	-200°C...200°C (-328°F...392°F)
Process pressure / max. overpressure limit	up to 25 bar (363 psi) abs
Max. measurement distance	55 m (180 ft)
Main wetted parts	316L, AlloyC276, PTFE
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
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 connection	Flange: DN80/3" / DN100/4" / DN150/6"
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
Accuracy	up to 0.4 mm
Process temperature	-200°C...200°C (-328°F...392°F)
Process pressure / max. overpressure limit	up to 25 bar (363 psi) abs
Max. measurement distance	55 m (180 ft)
Main wetted parts	316L, AlloyC276, PTFE
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

Servo tank gauging instrument Proservo NMS81

Servo tank gauging instrument Proservo NMS81

Servo tank gauging instrument Proservo NMS81

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Servo tank gauging instrument Proservo NMS81

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