Endress+Hauser Proservo NMS80 Instructions for use

Intelligent tank gauge for high-precision measurement of the level of liquids

with a 4-20 mA output signal and switch output

Products Solutions Services

Special Documentation

Proservo NMS80/81/83

Functional Safety Manual

SD01920G/00/EN/01.17

71350261

Proservo NMS80/81/83

2 Endress+Hauser

Table of contents

Declaration of Conformity .................... 3

Other safety-related characteristic values ............. 5

Useful lifetime of electric components ................ 5

Document information ....................... 6

Document function ............................ 6

Using this document ........................... 6

Symbols used ................................ 6

Supplementary device documentation ................ 7

Permitted devices types ...................... 8

SIL label on the nameplate ....................... 9

Safety function ............................. 9

Definition of the safety function .................... 9

Safety-related signal ........................... 9

Restrictions for use in safety-related applications ....... 10

Use in protective systems .................... 12

Device behavior during operation .................. 12

Parameter configuration for safety-related applications ... 13

Proof-testing ............................... 19

Life cycle ................................ 26

Requirements for personnel ..................... 26

Installation ................................. 26

Commissioning .............................. 26

Operation ................................. 26

Maintenance ............................... 26

Repairs ................................... 27

Modification ................................ 28

Appendix ................................ 29

Structure of the measuring system ................. 29

Proof-testing ............................... 31

Notes on the redundant configuration of multiple sensors .. 31

Further information ........................... 31

Proservo NMS80/81/83

Endress+Hauser 3

Declaration of Conformity

A0032861

Proservo NMS80/81/83

4 Endress+Hauser

A0032862

Proservo NMS80/81/83

Endress+Hauser 5

Other safety-related

characteristic values Characteristics as per IEC 61508 Value

Safety function MIN, MAX, Range

SIL SIL 2 (single-channel architecture 1oo1)

SIL 3 (multi-channel architecture, also with homogeneous

redundancy, e.g. 1oo2, 2oo3)

HFT 0

Device type B

Operating mode Low demand mode, high demand mode

SFF 98 %

MTTR 8 h

Recommended time interval for proof-testing T13 years

λsd 23 FIT

λsu 2 528 FIT

λdd 6 205 FIT

λdu 185 FIT

λtot 1) 8 941 FIT

PFDavg for T1 = 1 year 2) 8.59-4

PFDavg for T1 = 2 years 2) 1.67-3

PFH 1.85-7 h-1

MTBF 1) 28 years

Diagnostic test interval 3) 60 min

Fault reaction time 4) 60 s

System reaction time 5) In "Expert mode":

User configurable

1) According to Siemens SN29500. This value takes into account failure types relevant to the function of the

electronic components.

2) Valid for ambient temperature up to +40 °C (+104 °F). Where the average temperature when in continuous

use is in the region of +60 °C (+140 °F), a factor of 2.1 should be taken into account.

3) During this time, all diagnostic functions are executed at least once.

4) Time between error detection and error response.

5) Step response time as per DIN EN 61298-2: 274 s

Useful lifetime of electric

components

The established failure rates of electrical components apply within the useful lifetime as per

IEC 61508-2:2010 section 7.4.9.5, note 3. In accordance with DIN EN 61508-2:2011 section

7.4.9.5, national footnote N3, appropriate measures taken by the manufacturer and operator can

extend the useful lifetime.

Proservo NMS80/81/83

6 Endress+Hauser

Document information

Document function The document is part of the Operating Instructions and serves as a reference for application-specific

parameters and notes.

• General information about functional safety: SIL

• General information about SIL is available:

In the Download Area of the Endress+Hauser Internet site: www.de.endress.com/SIL

Using this document Information on the document structure

For the arrangement of the parameters as per the Operation menu, Setup menu, Diagnostics

menu, along with a short description, see the Operating Instructions for the device

Symbols used Safety symbols

Symbol Meaning

DANGER

DANGER!

This symbol alerts you to a dangerous situation. Failure to avoid this situation will

result in serious or fatal injury.

WARNING

WARNING!

This symbol alerts you to a dangerous situation. Failure to avoid this situation can

result in serious or fatal injury.

CAUTION

CAUTION!

This symbol alerts you to a dangerous situation. Failure to avoid this situation can

result in minor or medium injury.

NOTICE

NOTE!

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

personal injury.

Symbols for certain types of information

Symbol Meaning

A0011193

Tip

Indicates additional information.

Reference to documentation

Reference to page

Reference to graphic

… Series of steps

Symbols in graphics

Symbol Meaning

1, 2, 3,... Item numbers

… Series of steps

A, B, C, ... Views

Proservo NMS80/81/83

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Supplementary device

documentation Documentation Comment

Technical Information:

• TI01248G/00 (NMS80)

• TI01249G/00 (NMS81)

• TI01250G/00 (NMS83)

The documentation is available on the Internet:

→ www.endress.com

Operating Instructions

• BA01456G/00 (NMS80)

• BA01459G/00 (NMS81)

• BA01462G/00 (NMS83)

The documentation is available on the Internet:

→ www.endress.com

Brief Operating Instructions:

• KA01200G/00 (NMS80)

• KA01203G/00 (NMS81)

• KA01206G/00 (NMS83)

• The document is provided with the device.

• The documentation is available on the Internet:

→ www.endress.com

Safety instructions depending on the selected option

"Approval".

Additional safety instructions (XA, ZE) are supplied with

certified device version.

Please refer to the nameplate for the relevant safety

instructions.

This supplementary Safety Manual applies in addition to the Operating Instructions, Technical

Information and ATEX Safety Instructions. The supplementary device documentation must be

observed during installation, commissioning and operation. The requirements specific to the

protection function are described in this Safety Manual.

Proservo NMS80/81/83

8 Endress+Hauser

Permitted devices types

The details pertaining to functional safety in this manual relate to the device versions listed below

and are valid as of the specified software and hardware version. Unless otherwise specified, all

subsequent versions can also be used for safety functions. A modification process according to

IEC 61508 is applied for device changes.

Valid device versions for safety-related use:

Ordering feature Designation Option

010 Approval All

020 Connector type All

030 Power supply; display All

040 Primary output All 1)

E1 4 to 20 mA HART Ex d/XP

H1 4 to 20 mA HART Ex i/IS

050 Secondary I/O analog All 1)

A1 Ex d/XP, 1x 4 to 20 mA HART, 1x RTD input

A2 Ex d/XP, 2x 4 to 20 mA HART, 2x RTD input

B1 Ex i/IS, 1x 4 to 20 mA HART, 1x RTD input

B2 Ex i/IS, 2x 4 to 20 mA HART, 2x RTD input

060 Secondary I/O digital

Ex d/XP

All 1)

A1 2x relay + 2x module, discrete

A2 4x relay + 4x module, discrete

A3 6x relay + 6x module, discrete

B2 Modbus RS485 + 2x relay + 2x module, discrete

B3 Modbus RS485 + 4x relay + 4x module, discrete

070 Housing All except Y

080 Process pressure All

090 Electrical connection All

110 Measuring range; wire;

diameter

All except Y

120 Displacer material; type All except Y

130 Process seal All

140 Process connection All

150 Accuracy, approval for

custody transfer

All

500 Operating languages;

display

All

540 Application package All

570 Service All

580 Test; certificate All

590 Additional approval LA 2) SIL

610 Accessory mounted All

620 Accessory enclosed All

850 Firmware version If no version is selected here, the latest SIL-enabled SW

is supplied. Alternatively, the following SW version

may be selected: 76____01.02.zz

895 Marking All

1) At least one of the versions listed must be selected.

2) An additional selection of further versions is possible.

Proservo NMS80/81/83

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• Valid firmware version: as of 01.02.zz (→ nameplate of the device)

• Valid hardware version (electronics): as of date of production 23.11.2016 (→ nameplate of the

device)

SIL label on the nameplate SIL certified devices are marked with the following symbol on the nameplate:

Safety function

Definition of the safety

function

The device's safety functions are:

Safety function 1 (level measurement)

• Maximum point level monitoring (overfill protection)

• Minimum point level monitoring (dry run protection)

• Level range monitoring

The safety functions comprise the measurement of the level of a liquid.

Safety function 2 (current input measurement)

Current input monitoring

The safety function comprises the measurement of the current of a connected device.

Safety-related signal Digital

The device's safety-related signal is the closed relay contact of the digital output. All safety measures

refer to this signal exclusively.

The level value (safety function 1: level measurement) or the analog input current (safety function 2:

current input measurement) are correctly converted to a digital output value. The relay contact is

closed within the range of validity, and is open outside this range.

The safety-related output signal is fed to a downstream logic unit, e.g. a programmable logic

controller or a limit signal transmitter where it is monitored for the following:

• Exceed and/or undershoot a specific level limit.

• The occurrence of a fault, e.g. contact open (interruption of the signal line).

In case of fault it must be ensured that the equipment under control achieves or maintains a

safe state.

Analog

The device's safety-related signal is the analog output signal 4 to 20 mA. All safety measures refer to

this signal exclusively.

The device can also communicate via HART for information purposes and contains all the HART

features with additional device information.

The safety-related output signal is fed to a downstream logic unit, e.g. a programmable logic

controller or a limit signal transmitter where it is monitored for the following:

• Exceed and/or undershoot a specific level limit.

• The occurrence of a fault, e.g. error current (≤3.6 mA, ≥21.0 mA), interruption or short-circuit of

the signal line).

In case of fault it must be ensured that the equipment under control achieves or maintains a

safe state.

Proservo NMS80/81/83

10 Endress+Hauser

Restrictions for use in safety-

related applications

• The measuring system must be used correctly for the specific application, taken into account the

medium properties and ambient conditions. Carefully follow instructions pertaining to critical

process situations and installation conditions from the Operating Instructions. The application-

specific limits must be observed.

• Information on the safety-related signal, (→  9).

• The specifications from the Operating Instructions must not be exceeded, (→  7).

• The following restrictions also applies to safety-related use:

– Strong, pulse-like EMC interference on the line can cause transient (< 1 s) deviations ≥ ±2% in

the output signal. For this reason, filtering with a time constant of ≥ 1 s should be performed in

the downstream logic unit.

– The error range is device specific and is defined according to FMEDA (Failure Modes, Effects and

Diagnostic Analysis) on delivery. It includes all influential factors described in the Technical

Information (e.g. non-linearity, non-repeatability, hysteresis, zero drift, temperature drift, EMC

influences).

According to IEC / EN 61508 the safety related failures are classified into different categories,

see the following table. The table shows the implications for the safety-related analog output

signal and for measuring uncertainty.

Safety related error Explanation Implications for the

safety related output

signal

Implications for the

measuring uncertainty

(Position, see figure.

→  10)

No device error Safe:

No error

None 1 Is within the

specification (see TI,

BA, ...)

λSD Safe detected:

Safe failure which can be

detected

Causes the output signal

to signal the failsafe mode

(see, →  12)

3 No implications

λSU Safe undetected:

Safe failure which cannot

be detected

Is within the defined error

range

2 May be beyond the

specification

λDD Dangerous detected:

Dangerous failure which

can be detected

(Diagnostic within the

device)

Causes the output signal

to signal the failsafe mode

(see, →  12)

3 No implications

λDU Dangerous undetected:

Dangerous failure which

cannot be detected

May be outside the

defined error range

4 May be outside the

defined error range

I [mA]

A0025264

A HI-Alarm ≥21 mA

B Error range ±2 %

C LO-Alarm ≤3.6 mA

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