
Specs at a glance
-
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
47 m (154 ft)
-
Main wetted parts
316L, AlloyC276, PTFE
Field of application
The intelligent tank gauge Proservo NMS81 is designed for high accuracy liquid level measurement in custody transfer and inventory control applications with NMi- and PTB-approvals. It meets the relevant requirements according to OIML R85 and API 3.1B. It fulfills the exact demands of tank inventory management and loss control and is optimized in regards of total cost saving and safe operation.
For high accuracy custody transfer measurement in crude oil, gasoline, diesel, petrochemicals and chemicals.
Process connections: Flanges
Temperature: -200 to +200°C (-328 to +392°F)
Pressure: 0 to +25bar (0 to +362psi)
Maximum measuring range: 47m (154ft)
Accuracy: ±0.4mm (±0.02")
International explosion protection and custody transfer certificates, overfill prevention WHG, SIL
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
Videos
Xpert selection
-
Specialized products
- Designed for demanding applications
Technical excellence
Simplicity
Variable

-
Standard products
- Reliable, robust and low-maintenance
Technical excellence
Simplicity
-
Specialized products
- Designed for demanding applications
Technical excellence
Simplicity
Variable
FLEX selections | Technical excellence | Simplicity |
---|---|---|
Fundamental selection Meet your basic measurement needs |
Technical excellence
|
Simplicity
|
Lean selection Handle your core processes easily |
Technical excellence
|
Simplicity
|
Extended selection Optimize your processes with innovative technologies |
Technical excellence
|
Simplicity
|
Xpert selection Master your most challenging applications |
Technical excellence
|
Simplicity
Variable |
Predecessor
Success stories
-
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
47 m (154 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, UK Ex -
Safety approvals
Overfill protection WHG
SIL -
Design approvals
EN 10204-3.1
NACE MR0175, MR0103 -
Metrological approvals and certificates
OIML, NMi, PTB
-
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
-
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
-
-
Technical Information (TI)
TI Proservo NMS81
English version - 12/2024
New version available in English
Tank Gauging
EN 27/12/202425/10/202310/11/202205/08/202013/07/2018Language:
English
Version:
27/12/2024
File size:
6.1 MB
File name:
TI01249GEN_0824-00.pdf
-
-
-
Technical Information (TI)
TI Proservo NMS81
-
Technical Information (TI)
English version - 12/2024Tank Gauging
EN 27/12/202425/10/202310/11/202205/08/202013/07/2018Language:
English
Version:
27/12/2024
File size:
6.1 MB
File name:
TI01249GEN_0824-00.pdf
-
-
-
Device Parameter (GP)
GP Proservo NMS81
-
Device Parameter (GP)
English version - 12/2024Tank Gauging
EN 27/12/202410/10/202317/02/202320/07/201829/06/2017Language:
English
Version:
27/12/2024
File size:
4.6 MB
File name:
GP01077GEN_0624-00.pdf
-
-
-
Short Instruction (KA)
KA Proservo NMS81
-
Short Instruction (KA)
English version - 12/2024Tank Gauging
EN 27/12/202410/11/202205/08/202030/07/201824/05/2017Language:
English
Version:
27/12/2024
File size:
7.6 MB
File name:
KA01203GEN_0724-00.pdf
-
-
-
Installation Instructions (EA)
SD card with holder Installation Instructions
-
Installation Instructions (EA)
English version - 09/2017Micropilot NMR8x; Proservo NMS8x; Tankside Monitor NRF81
EN 30/09/201730/11/2016Language:
English
Version:
30/09/2017
File size:
1 MB
File name:
EA01184GA2_0217.pdf
-
-
-
Installation Instructions (EA)
O-ring, Servo Installation Instructions
-
Installation Instructions (EA)
English version - 10/2017Proservo NMS8x
EN 24/10/2017Language:
English
Version:
24/10/2017
File size:
3.2 MB
File name:
EA01235GF3_0117.pdf
-
-
-
Installation Instructions (EA)
Housing filter Installation Instructions
-
Installation Instructions (EA)
English version - 02/2018Micropilot, Proservo, Tankside Monitor
EN 28/02/201830/11/2016Language:
English
Version:
28/02/2018
File size:
404 KB
File name:
EA01183GA2_0218.pdf
-
-
-
Installation Instructions (EA)
Display set, display holder Installation Instructions
-
Installation Instructions (EA)
English version - 11/2016Micropilot NMR8x; Proservo NMS8x; Tankside Monitor NRF81
EN 30/11/2016Language:
English
Version:
30/11/2016
File size:
1.1 MB
File name:
EA01185GA2_0116.pdf
-
-
-
Installation Instructions (EA)
Terminal set Installation Instructions
-
Installation Instructions (EA)
English version - 11/2016Micropilot NMR8x; Proservo NMS8x; Tankside Monitor NRF81
EN 30/11/2016Language:
English
Version:
30/11/2016
File size:
1 MB
File name:
EA01186GA2_0116.pdf
-
-
-
Installation Instructions (EA)
Displacer unit, Servo Installation Instructions
-
Installation Instructions (EA)
English version - 10/2017Proservo NMS8x
EN 24/10/2017Language:
English
Version:
24/10/2017
File size:
1.9 MB
File name:
EA01234GF3_0117.pdf
-
-
Wire ring, PTFE
-
Meas. wire/tape
Drawing numberOrder code8071273746 -
Choose from our suggested options
-
-- selected coding-- selected label99.999,00<%label%>
-
Looking for more options? Please use the individual configurator to continue
-
-- selected coding-- selected label99.999,00<%feature%>
-
<%label%>99.999,00
-
Looking for more options? Please use the individual configurator to continue
-
Process Connection
-
<%label%>99.999,00
-
<%label%>99.999,00
-
-
<%feature%><%coding%><%label%>
- CAD drawings CAD drawings
- CAD drawings
-
Prices per piece
-
<%range%><%price%>
-
- Optional add-ons
Individual configuration
Often bought together
Accessories
We value your privacy
We use cookies to enhance your browsing experience, collect statistics to optimize site functionality, and deliver tailored advertisements or content.
By selecting "Accept all", you consent to our use of cookies.
For further details please review our cookie policy .