NMS80 Proservo Tank Gauge

NMS80 Proservo Tank Gauge

The NMS80 Proservo Tank Gauge (PTG) is an intelligent tank gauge for high accuracy liquid level measurement and is suited for both custody transfer and inventory management applications employing the latest microprocessor technology.


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Designed for Industry

The NMS80 PTG is suitable for atmospheric and high pressure applications with a maximum reliability accuracy level of up to ±0.4 mm (±0.016 in). To make sure it fits your existing tank fittings, we have a wide variety of process connections to choose from.


True Multi-Measurement

In addition to level measurement, the NMS80 PTG can determine the interfaces between three liquids, specific gravity of these liquids and tank bottom. This allows the instrument to provide spot density measurements, profile the liquid density throughout the tank, or profile the stratified upper layer.


Proactive Safety Diagnostics

In the event of an abnormal measurement condition, the NMS80 PTG outputs a maximum level value to the local display and system software, thereby causing an alarm to warn your operators.


Compatible Communications

Output signals include industry standard RS-485 (MODBUS), as well as popular tank gauging protocols, such as V1 and HART. You are also able to connect a spot or average temperature probe directly to the instrument.




Industry Approval

The NMS80 PTG has FM, ATEX and IEC Ex and NEPSI approval for use in hazardous areas. It is also NMi, OIML and PTB approved for custody transfer applications and SIL2 certified for overfill prevention.


Simplifying Maintenance

Small features make your operators’ lives easier and safer; intelligent diagnostics provide advance warning of required maintenance, such as replacement of worn wire. Wetted parts are completely separated from the electronic circuit and the built in calibration window allows operators to ensure the correct position of the displacer before service work is underway.




+/-0.4 mm for (+/- 0.015 in)
(Under reference condition, according to OIML R85)



Interface Level

+/-2 mm (+/-0.08)
(Difference of product densities 0.100 g/cm3 (6.25lb/ft3))

Net Weight

15 kg (33.1 lb)

Standard Range

28m with 316L measuring wire

Spot and Profile Density

+/-0.003 g/cm3 (Under reference condition, according to OIML R85)

Medium Density

0.430 to 2.000 g/cm3 (27 to 125 lb/ft3)

Medium Density Difference

0.1 g/cm3 (6.24 lb/ft3)


0 to 5 000 mPa s

Enclosure Materials

Electrical compartment: aluminium
Drum chamber: aluminium
Rated IP66/68, NEMA Type 4x/6P enclosure

Wire Protection

PTFE coated St/St 316L, 0.4mm (max 16m)

Pressure Rating

Suitable for atmospheric and high pressure applications up to 6 bar/0.6 MPa/87 psi

Power Requirements

High voltage type: 85 to 264 VAC, 50/ 60
Hz, 28.8 VA
Low voltage type: 52 to 75 VAC, 50/60 Hz, 21.6 VA
19 to 64 VDC, 13.4 W

Safe Electrical Isolation

Bus inputs are electrically isolated from the other electronics

Operating (liquid) Temperature

-200 to +200°C (-328 to 392°F)

Ambient Temperature

Device: -40 to +60°C (-40 to +140°F)
Display Module: -20 to +70°C (-4 to +158°F)

Display (LCD)

Four line, white background lighting, switches to red for device errors
Language selection: English, German, Japanese


Tank side monitoring and operation can be performed by the remote display and operating module DKX001;  operation via the DKX001 is possible without opening the device

Configuration software (e.g., DeviceCare); connected via:
– Service port (CDI) with optional Commubox FXA291

HART Ex ia/IS Active Input

The HART Ex ia/IS active input is available by default. It needs not to be chosen
explicitly when ordering a device.



Metrological approvals and certificates – OIML, NMi, PTB

For complete technical specifications, download the product manual.

Flange Type

ASME or DIN. Refer to order code for full selection

Wire Material and Ranges

28 m (93.33 ft), 36 m (120 ft): 316L
16 m (53.33 ft): PFA > 316L
22 m (73.33 ft): AlloyC276

Displacer Diameter

30…50mm (dependent on application), optional 70…110mm


Displacer Material

Stainless steel 316L, AlloyC, or PTFE

Measuring Range, Wire MaterialCable Entry

NPT, Metric, BSP (G) class threads

Primary Outputs

4-20mA HART Ex d/XP
+ 4-20mA HART Ex i/IS

Secondary I/O Analog

1 x “Ex d/XP 4-20mA HART + RTD input”
2 x “Ex d/XP 4-20mA HART + RTD input”
1 x “Ex i/IS 4-20mA HART+ RTD input”
2 x “Ex i/IS 4-20mA HART+ RTD input”
1 x “Ex i/IS 4-20mA HART + RTD input”
1 x “Ex d/XP 4-20mA HART + RTD input”

Secondary I/O Exd

1 x “2x relay + 2x discrete I/O”
2 x “2x relay + 2x discrete I/O”
3 x “2x relay + 2x discrete I/O”
1x “Modbus RS485”
1x “Modbus RS485”, 1 x “2x relay + 2x
discrete I/O”
1x “Modbus RS485”, 2 x “2x relay + 2x
discrete I/O”

Power Supply

85-264VAC; LCD + operation

Displacer Material

316L; 30mm cylindrical
316L; 50mm cylindrical
316L; 70mm conical
316L; 110mm conical
PTFE; 30mm cylindrical
PTFE; 50mm cylindrical
AlloyC276; 50mm cylindrical

Process Pressure

0… 0.2bar/20kPa/2.9psi
0… 6bar/600kPa/87psi



Servo Gauge Comparison Guide
Easy-to-follow guide that compares the NMS80 and NMS81 servo gauges.

Parts and Accessories

Servo Tank Gauging Checklist
Checklist for Servo Tank Gauge needs.

Application Checklists

Temperature Tank Gauging Checklist
Checklist for Temperature Tank Gauging needs.


NMS80 Proservo Tank Gauge Installation and Operations Manual
Please visit the Endress and Hauser website to access the technical manual and operating instructions for the NMS80 Servo Tank...


NMS80 Proservo Tank Gauge Approvals and Certificates
Please visit the Endress and Hauser website to access the approvals and certificates for the NMS80 Servo Tank Gauge.

Technical Specifications

NMS80 Proservo Tank Gauge Technical Specifications
The technical specifications for the NMS80 Proservo Tank Gauge.


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