Endress+Hauser NRF81 Specifications

TI01251G/00/EN/02.17
71355021

Products Solutions Services

Technical Information

Tankside Monitor NRF81

Tank Gauging

Application

Tankside Monitor NRF81 is a robust gateway for collecting and integrating tank
gauging data in storage and process applications. It fulfills the exacting demands of
tank inventory management, inventory control, custody transfer, loss control, total
cost saving, and safe operation.

Typical areas of application

• Hydrostatic Tank Gauging

• Hybrid Tank Measurement Systems

Your benefits

• SIL2 certified (Min, Max, Continuous level)

• SIL3 (in preparation)

• Up to 6 SIL relay outputs

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

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

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

• Operation and display in a wide variety of local languages

Table of contents

Tankside Monitor NRF81

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

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

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

Integration of tank sensors ....................... 5

Input/output ............................... 6

HART Ex ia/IS active input ....................... 6

I/O modules ................................. 7

Power supply ............................. 13

Terminal assignment .......................... 13

Supply voltage .............................. 13

Cable entries ............................... 14

Cable specification ............................ 14

Overvoltage protection ......................... 14

Installation ............................... 15

Installation conditions ......................... 15

Environment .............................. 17

Ambient temperature range ..................... 17

Classification of environmental conditions according to

DIN EN 60721-3-4 ........................... 17

Storage temperature .......................... 17

Humidity .................................. 17

Degree of protection .......................... 17

Shock resistance ............................. 17

Vibration resistance ........................... 17

Electromagnetic compatibility (EMC) ............... 17

Ordering information ....................... 25

Ordering information .......................... 25

Marking .................................. 25

Application packages ....................... 26

Advanced tank measurement methods .............. 26

Accessories ............................... 31

Device-specific accessories ...................... 31

Communication-specific accessories ................ 32

Service-specific accessories ...................... 32

System components ........................... 32

Documentation ............................ 33

Technical Information (TI) ...................... 33

Brief Operating Instructions (KA) .................. 33

Operating Instructions (BA) ..................... 33

Description of Device Parameters (GP) ............... 33

Safety instructions (XA) ........................ 34

Registered trademarks ...................... 35

Custody transfer approval ................... 18

Mechanical construction .................... 19

Dimensions ................................ 19

Weight ................................... 19

Materials .................................. 20

Operability ............................... 21

Operating concept ............................ 21

Operating options ............................ 21

Local operation .............................. 21

Remote operation ............................ 22

Operation via service interface .................... 22

Certificates and approvals ................... 23

CE mark ................................... 23

RCM-Tick marking ............................ 23

Ex approval ................................ 23

Single seal according to ANSI/ISA 12.27.01 ........... 23

Functional Safety (SIL) ......................... 23

WHG ..................................... 23

Weight & Measure approval ..................... 23

Non-ionizing radiation protection .................. 23

Other standards and guidelines ................... 23

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Tankside Monitor NRF81

DANGER

WARNING

CAUTION

NOTICE

A

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

1.

-

.

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.

Tankside Monitor NRF81

Hazardous area

Indicates a hazardous area.

Safe area (non-hazardous area)

Indicates the non-hazardous area.

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Tankside Monitor NRF81

2 2

3

3

1 1

HART

4-20 mA

A

B

HART

4-20 mA

HART

HART

4

55

6 6

4

Function and system design

Integration of tank sensors

The Tankside Monitor is a field device for the integration of tank sensors into tank inventory
systems. It is typically installed at the bottom of the tank and allows access to all connected tank
sensors. All measured and calculated values can be displayed at the on-site display. Via a field
communication protocol, they can be transferred to an inventory control system.

A0023766

 1 Integration of tank sensors with Tankside Monitor (Example)

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

Typical values measured by the sensors are:

• Level

• Spot temperature

• Average temperature

• Water level

• Pressure

• Secondary level value (for critical applications)

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HART Ex ia/IS active input

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Tankside Monitor NRF81

Input/output

A0027364

 2 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.

• Micropilot S FMR53x
The calculated distance correction factor or distance correction value is sent to the Micropilot.
Micropilot uses this value to indicate the corrected level at its local display.

Technical data

Transmitter power supply voltage 23.0 V - 380 Ω ⋅ I

Maximum load 500 Ω including signal line

Maximum current of all connected devices 24 mA

load

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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NRF81 - XX xx xxxxxx ...

040

NRF81 - xx XX xxxxxx ...

050

I/O modules Overview

 3 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.

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 →  8

B1 1 V1 4 →  9

E1 1 4-20mA HART Ex d/XP 8 →  10

H1 1 4-20mA HART Ex i/IS 8 →  10

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 →  10

A2 2 2 x "Ex d/XP 4-20mA HART + RTD input" 2 x 8 →  10

B1 1 1 x "Ex i/IS 4-20mA HART+ RTD input" 1 x 8 →  10

B2 2 2 x "Ex i/IS 4-20mA HART+ RTD input" 2 x 8 →  10

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 →  10

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

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Tankside Monitor NRF81

NRF81 - 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 →  12

A2 2 2 x "2x relay + 2x discrete I/O" 2 x 4 →  12

A3 3 3 x "2x relay + 2x discrete I/O" 3 x 4 →  12

B1 1 1x "Modbus RS485" 1 x 4 →  8

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 -

"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

2 x 4 →  8

→  12

3 x 4 →  8

→  12

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Tankside Monitor NRF81

"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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Tankside Monitor NRF81

"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

Connection of a Micropilot S
FMR5xx

Connection of a RTD
temperature probe

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

• The auxiliary energy for the Micropilot S can be supplied by the analogue
I/O module

• The calculated distance correction factor or distance correction value is sent
to the Micropilot. Micropilot uses this value to indicate the corrected level at
its local display.

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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Tankside Monitor NRF81

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Data for passive usage (input or output)

A0033030

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

Minimum terminal voltage 10.4 V

Maximum terminal voltage 29 V

Data for active usage (input or output)

 5 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

load

A0033031

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