Endress+Hauser NMR81 Specifications

TI01252G/00/EN/03.18 71406890 2018-06-07

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Technical Information

Micropilot NMR81

Tank Gauging

Application

Micropilot NMR8x Series intelligent tank gauges are designed for high accuracy liquid level measurement in storage and process applications. They fulfill the exacting demands of tank inventory management, inventory control, custody transfer, loss control, total cost saving, and safe operation.

Typical areas of application

• Precise level measurement of oil (fuels), chemicals, and alcohol in free space

• Tank mounted intelligence makes NMR8x ideal for single or multi-task installations, measuring the liquid level and integrating a wide range of tank sensor measurement functions including: Liquid level, Water level, Temperature and Pressure.

Your benefits

• SIL2 certified (Min, Max, Continuous level)

• SIL3 (in preparation)

• Up to 6 SIL relay outputs

• Measures liquid level to an accuracy of +/- 0.5 mm (0.02 in)

• Wetted parts are completely separated from the electronic circuit

• Tank top mounting as small as 2"/DN50 flange

• Wide range of output signals including V1, Modbus RS 485, and HART protocol

• Suitable for atmospheric and high pressure applications up to 16 bar/

1.6 MPa (232 psi)

• Maintenance prediction of the instrument

• Integration of e.g. temperature, water level, pressure, overfill prevention sensor

• Direct connection of spot or average temperature sensor

• Robust IP66/68, NEMA Type 4x/6P enclosure

• Operation and display in a wide variety of local languages

Micropilot NMR81

Document information ....................... 3

Symbols .................................... 3

Function and system design ................... 5

Measuring principle ............................ 5

Integration of tank sensors ....................... 6

Measuring system ............................. 7

Input/output ............................... 8

Level measurement ............................ 8

HART Ex ia/IS active input ....................... 9

I/O modules ................................ 10

Power supply ............................. 16

Terminal assignment .......................... 16

Supply voltage .............................. 16

Cable entries ............................... 17

Cable specification ............................ 17

Overvoltage protection ......................... 17

Performance characteristics .................. 18

Sampling rate ............................... 18

Reference operating conditions ................... 18

Measured value resolution ...................... 18

Maximum measured error ....................... 18

Hysteresis ................................. 18

Repeatability ............................... 18

Linearity .................................. 18

Long-term drift .............................. 18

Influence of ambient temperature ................. 18

Materials .................................. 28

Operability ............................... 30

Operating concept ............................ 30

Operating options ............................ 30

Local operation .............................. 30

Remote operation ............................ 31

Operation via service interface .................... 31

Certificates and approvals ................... 32

CE mark ................................... 32

RCM-Tick marking ............................ 32

Ex approval ................................ 32

Single seal according to ANSI/ISA 12.27.01 ........... 32

Functional Safety (SIL) ......................... 32

WHG ..................................... 32

Weight & Measure approval ..................... 32

Radio standard EN302372-1/2 ................... 32

FCC / Industry Canada ......................... 32

Non-ionizing radiation protection .................. 33

CRN approval ............................... 33

Pressure equipment with allowable pressure

≤ 200 bar (2 900 psi) .......................... 33

Test, certificate .............................. 33

Other standards and guidelines ................... 34

Ordering information ....................... 35

Ordering information .......................... 35

Calibration certificate .......................... 35

Marking .................................. 35

Installation ............................... 19

Installation conditions ......................... 19

Environment .............................. 21

Ambient temperature range ..................... 21

Ambient temperature limits ..................... 21

Classification of environmental conditions according to

DIN EN 60721-3-4 ........................... 22

Storage temperature .......................... 22

Humidity .................................. 22

Degree of protection .......................... 22

Shock resistance ............................. 22

Vibration resistance ........................... 22

Electromagnetic compatibility (EMC) ............... 22

Process .................................. 23

Process temperature range ...................... 23

Process pressure range ......................... 23

Dielectric constant ............................ 23

Custody transfer approval ................... 24

Mechanical construction .................... 25

Dimensions ................................ 25

Weight ................................... 27

Application packages ....................... 36

Advanced tank measurement methods .............. 36

Accessories ............................... 39

Device-specific accessories ...................... 39

Communication-specific accessories ................ 41

Service-specific accessories ...................... 41

System components ........................... 41

Documentation ............................ 42

Technical Information (TI) ...................... 42

Brief Operating Instructions (KA) .................. 42

Operating Instructions (BA) ..................... 42

Description of Device Parameters (GP) ............... 42

Safety instructions (XA) ........................ 43

Registered trademarks ...................... 44

2 Endress+Hauser

Micropilot NMR81

DANGER

WARNING

CAUTION

NOTICE

Document information

Symbols Safety symbols

Symbol Meaning

Electrical symbols

DANGER!

This symbol alerts you to a dangerous situation. Failure to avoid this situation will result in serious or fatal injury.

WARNING!

This symbol alerts you to a dangerous situation. Failure to avoid this situation can result in serious or fatal injury.

CAUTION!

This symbol alerts you to a dangerous situation. Failure to avoid this situation can result in minor or medium injury.

NOTE!

This symbol contains information on procedures and other facts which do not result in personal injury.

Symbol Meaning

Direct current

Alternating current

Direct current and alternating current

Ground connection

A grounded terminal which, as far as the operator is concerned, is grounded via a grounding system.

Protective ground connection

A terminal which must be connected to ground prior to establishing any other connections.

Equipotential connection

A connection that has to be connected to the plant grounding system: This may be a potential equalization line or a star grounding system depending on national or company codes of practice.

Symbols for certain types of information

Symbol Meaning

Permitted

Procedures, processes or actions that are permitted.

Preferred

Procedures, processes or actions that are preferred.

Forbidden

Procedures, processes or actions that are forbidden.

Tip

Indicates additional information.

Reference to documentation

Reference to page

Reference to graphic

Visual inspection

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Symbols in graphics

Symbol Meaning

1, 2, 3 ... Item numbers

, 2., 3.… Series of steps

A, B, C, ... Views

A-A, B-B, C-C, ... Sections

Symbols at the device

Symbol Meaning

Safety instructions

Observe the safety instructions contained in the associated Operating Instructions.

Temperature resistance of the connection cables

Specifies the minimum value of the temperature resistance of the connection cables.

Micropilot NMR81

Hazardous area

Indicates a hazardous area.

Safe area (non-hazardous area)

Indicates the non-hazardous area.

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Micropilot NMR81

1 2

Δt

Δf

Function and system design

Measuring principle

Micropilot is a directional level radar, operating based on the "Frequency-Modulated Continuous Wave" principle (FMCW). The radar emits a precise crystal-oscillated, continuously varying frequency wave from the antenna. The wave is reflected off the product surface and received again by the radar system.

A0023768

 1 FMCW principle: Emission and reflection of the continuous wave.

R Reference point of the measurement D Distance between R and the product surface

The frequency of this wave is precisely modulated in the form of a sawtooth signal between two limit frequencies f1 and f2:

A0023771

 2 FMCW principle: Results of the frequency modulation

1 Emitted signal 2 Received signal

Thus, at any given time the frequencies of the emitted and the received signal differ by

Δf = k Δt

where Δt is the transit time and k is the known slope of the frequency modulation.

Δt, on the other hand, is determined by the distance D between the reference point R and the product surface:

D = (c Δt) / 2

where c is the speed of propagation of the wave.

In summary, D can be calculated from the measured frequency shift Δf. D is then used to calculate the contents of the tank.

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Micropilot NMR81

3 3

4 4

2 2

1 1

HART 4-20 mA

HART HART

5 5

Integration of tank sensors

In addition to measuring the level, the device can also be used for the integration of tank sensors into tank inventory systems. All measured and calculated values can be displayed at the built-in display. Via a field communication protocol, they can be transferred to an inventory control system.

A0023767

 3 Integration of tank sensors with Micropilot (Example)

A HART multidrop mode B HART and analog mode 1 Pressure transmitter 2 Average temperature transmitter 3 Micropilot 4 Field protocol transmits data to an inventory control system 5 Inventory control system (e.g. Tankvision NXA820 or Tankvision Professional NXA85)

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Micropilot NMR81

NXA820

23 3 5 2 3

4 6

Measuring system

• From single tank level measurement to the largest oil refinery applications, Endress+Hauser tank gauging devices are an integral part of tank farm management solutions. A wide variety of data output protocols are available for seamless integration into many commonly used systems.

• A primary example is Tankvision from Endress+Hauser. Tankvision is a scalable system offering local tank management for multiple loops via Modbus or V1 protocols. Accumulated data is available to DCS and other plant management systems via a Host Link.

A0027700

 4 Integration of tank gauging devices into an inventory management system (typical example)

1 Proservo NMS8x 2 Pressure transmitter (e.g. Cerabar) 3 Temperature transmitter (e.g. Prothermo) 4 Tankside Monitor NRF81 5 Micropilot S FMR5xx 6 Micropilot NMR8x 7 Field protocol (e.g. Modbus, V1) 8 Tankvision Tank Scanner NXA820 9 Ethernet 10 Ethernet switch 11 Internet Browser 12 Tankvision Data Concentrator NXA821 13 Tankvision Host Link NXA822 14 Modbus 15 DCS or PLC

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Input/output

Level measurement Measured variable

The measured variable is the distance between a reference point (mounting flange) and a reflective surface (e.g. product surface).

Maximum measuring range

The maximum measuring range depends on the dielectric constant εr of the measured medium and on the size of the antenna:

Micropilot NMR81

Dielectric constant ε

1.4 to 1.9 4 m (13 ft) 15 m (49 ft) 25 m (82 ft)

1.9 to 4 8 m (26 ft) 30 m (98 ft) 50 m (164 ft)

4 to 10 20 m (66 ft) 60 m (197 ft)

> 10 30 m (98 ft) 70 m (230 ft)

1) Feature 100 of the product structure

2) For devices with Weight+Measure approval: Maximum measuring range: 30 m (97 ft)

50mm/2" 80mm/3" 100mm/4"

Antenna

70 m (230 ft)

For dielectric constants (DC values) of many media commonly used in various industries refer to:

• the Endress+Hauser DC manual (CP01076F)

• the Endress+Hauser "DC Values App" (available for Android and iOS) For devices with Weight+Measure approval (option NTA, NTC, PTA or PTC of ordering feature

150 "Accuracy, Weight + Measure Approval"): Maximum measuring range:

0.8 to 30 m (2.6 to 97 ft) The actual usable measuring range depends on additional criteria like the mounting location or

possible interference reflections. Minimum distance from flange to product surface: 0.8 m (2.6 ft)

Operating frequency

Device Operating frequency

NMR81 approx. 80 GHz

Transmitting power

Device Peak pulse power Average output power

NMR81 6.3 mW 63 µW

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Micropilot NMR81

1 3

2 4

CDI

SIM

22334

112233445566778

POWER

CDI

1 2 3 4

HART Ex ia/IS active input

A0027364

 5 HART Ex ia/IS active input

E1 HART + E2 HART -

The device has a HART Ex ia/IS active input. Additional features are provided if the following Endress+Hauser devices are connected:

Prothermo NMT

The measured level is transmitted to the Prothermo. Prothermo uses this level to calculate the average temperature of the product.

Technical data

Transmitter power supply voltage 23.0 V - 380 Ω ⋅ I

load

Maximum load 500 Ω including signal line

Maximum current of all connected devices 24 mA

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

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I/O modules Overview

1 3

2 4

CDI

SIM

POWER

1122334

112233445566778

1 3

2 4

CDI

SIM

22334

112233445566778

POWER

NMx8x - XX xx xxxxxx ...

040

NMx8x - xx XX xxxxxx ...

050

 6 Position of the I/O modules in the terminal compartment

The terminal compartment contains up to four I/O modules, depending on the order code.

• Modules with four terminals can be in any of these slots.

• Modules with eight terminals can be in slot B or C. The exact assignment of the modules to the slots is dependent on the device version. For a

detailed description refer to the Operating Instructions of the device in question. The following restrictions apply when selecting the modules:

• The device may contain a maximum of four I/O modules.

• A maximum of two I/O modules with 8 terminals is possible.

Micropilot NMR81

A0027363

Ordering feature 040: "Primary Output"

Option Number of I/O modules Type of I/O module Number of terminals Technical data

A1 1 Modbus RS485 4 →  11

B1 1 V1 4 →  12

E1 1 4-20mA HART Ex d/XP 8 →  13

H1 1 4-20mA HART Ex i/IS 8 →  13

Ordering feature 050: "Secondary IO Analogue"

Option Number of I/O

modules

A1 1 1 x "Ex d/XP 4-20mA HART + RTD input" 1 x 8 →  13

A2 2 2 x "Ex d/XP 4-20mA HART + RTD input" 2 x 8 →  13

B1 1 1 x "Ex i/IS 4-20mA HART+ RTD input" 1 x 8 →  13

B2 2 2 x "Ex i/IS 4-20mA HART+ RTD input" 2 x 8 →  13

C2 2 1 x "Ex i/IS 4-20mA HART + RTD input"

X0 0 none 0 -

Type of I/O module Number of terminals Technical data

2 x 8 →  13

1 x "Ex d/XP 4-20mA HART + RTD input"

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Micropilot NMR81

NMx8x - xx xx XXxxxx ...

060

Ordering feature 060: "Secondary IO Digital Exd"

Option Number of I/O modules Type of I/O module Number of terminals Technical data

A1 1 1 x "2x relay + 2x discrete I/O" 1 x 4 →  15

A2 2 2 x "2x relay + 2x discrete I/O" 2 x 4 →  15

A3 3 3 x "2x relay + 2x discrete I/O" 3 x 4 →  15

B1 1 1x "Modbus RS485" 1 x 4 →  11

B2 2 1x "Modbus RS485"

1 x "2x relay + 2x discrete I/O"

B3 3 1x "Modbus RS485"

2 x "2x relay + 2x discrete I/O"

X0 0 none 0 -

2 x 4 →  11

→  15

3 x 4 →  11

→  15

"Modbus RS485": Technical data

No. of units Maximum 15 instruments per loop

Baud rate Selectable:

• 600 bit/s

• 1 200 bit/s

• 2 400 bit/s

• 4 800 bit/s

• 9 600 bit/s

• 19 200 bit/s

Parity Selectable:

• Odd

• Even

• None

Cable Three-wire cable with screening. The screening must be connected inside the housing.

Termination resistors To be set as required in specific environments

Topology • Serial bus

• Tree structure

Transmission distance Maximum 1 200 m (3 900 ft) including limbs or branches;

branches under 3 m (9.8 ft) are negligible

Instrument address Each transmitter has an individual bus address configured in the software of the

transmitter.

Isolation Bus inputs are electrically isolated from the other electronics.

Error on alarm Error message classified according to NAMUR NE 107

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Micropilot NMR81

"V1": Technical data

No. of units Maximum 10 instruments per loop

Baud rate 3 300 bit/s

Parity Selectable:

• Odd

• Even

• None

Cable • Two-wire twisted pair; screening recommended

• Two-wire unscreened

Termination resistors Not required

Topology • Serial bus

• Tree structure

Transmission distance Maximum 6 000 m (19 700 ft)

Instrument address Each transmitter has an individual bus address configured in the software of the

transmitter.

Isolation Serial communication circuit isolated from other circuits

Error on alarm Error message classified according to NAMUR NE 107

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Micropilot NMR81

"4-20mA HART" I/O module (Ex d/XP or Ex i/IS): Technical data

General data

No. of units Max. 6 instruments per loop

Baud rate 1 200 bit/s

Cable Two-wire, twisted pair screened cable;

Core cross section: 0.2 to 2.5 mm2 (24 to 13 AWG)

Topology • Serial bus

• Tree structure

Transmission distance Maximum 1 200 m (3 900 ft)

Instrument address Each transmitter on a signal loop has an individual bus address. This is defined within

the transmitter software and / or auxiliary configuration environment such as host system or Field Communicator 475.

Isolation Bus inputs are electrically isolated from the other electronics

Input data

Input operating modes • 4..20mA input (1 external device)

• HART master+4..20mA input (1 external device)

• HART master (up to 6 external devices)

Internal load (to ground) 400 Ω

Measuring range 0 to 26 mA

Accuracy ±15 µA (after linearization and calibration)

Connection of a Prothermo NMT The measured level is transmitted to the Prothermo. Prothermo uses this

level to calculate the average temperature of the product.

Connection of a RTD temperature probe

2-, 3- or 4-wire connection

Output data

Output operating modes • 4..20mA output

• HART slave +4..20mA output

Output current 3 to 24 mA

Accuracy ±15 µA (after linearization and calibration)

Error on alarm HART error message classified according to NAMUR NE 107

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Data for passive usage (input or output)

1 3

2 4

CDI

SIM

22334

112233445566778

POWER

1 3

2 4

CDI

SIM

1122334

112233445566778

POWER

1 3

2 4

CDI

SIM

22334

112233445566778

POWER

1 3

2 4

CDI

SIM

1122334

112233445566778

POWER

 7 Passive input or output: Use terminals 1 and 2

Minimum terminal voltage 10.4 V

Maximum terminal voltage 29 V

Micropilot NMR81

A0033030

1) Observing these values is mandatory in order to ensure correct measured value information.

Data for active usage (input or output)

 8 Active input or output: Use terminals 2 and 3

Transmitter power supply voltage (Ex d/XP)

Transmitter power supply voltage (Ex i/IS)

Output load max. 500 Ω including signal line

18.5 V - 360 Ω ⋅ I

20.0 V - 360 Ω ⋅ I

load

A0033031

14 Endress+Hauser

1) Observing this value is mandatory in order to ensure correct measured value information.

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Endress+Hauser NMR81 Specifications

Table of contents

Document information

Symbols Safety symbols

Function and system design

Measuring principle

Integration of tank sensors

Measuring system

Input/output

Level measurement Measured variable

HART Ex ia/IS active input

I/O modules Overview