SERVOTOUGH Laser 3 Plus Functional Safety Manual 07931006B_3
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SERVOTOUGH Laser 3 Plus Functional Safety Manual 07931006B_3 - 1

SERVOTOUGH Laser 3 Plus FUNCTIONAL SAFETY MANUAL OPERATOR MANUAL Part Number: Revision: Language:

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SERVOTOUGH Laser 3 Plus Functional Safety Manual 07931006B_3 - 3

IMPORTANT INFORMATION Continued safe and reliable operation of this equipment is conditional on all installation, operation and maintenance procedures being carried out in accordance with the appropriate manuals, by personnel having appropriate qualifications, experience and training. Failure to observe the requirements of the manual may result in the user being held responsible for the consequences and may invalidate any warranty. Servomex will accept no liability for unauthorized modifications to Servomex supplied equipment. This manual should be read in conjunction with the other product...

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SERVOTOUGH Laser 3 Plus Functional Safety Manual 07931006B_3 - 4

© Servomex Group Limited 2019

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© Servomex Group Limited 2019

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© Servomex Group Limited 2019

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About this manual Safety information Sections of this manual contain supplementary installation and configuration instructions. These should always be read in conjunction with the other manuals listed below which provide more detailed instructions and contain important safety information. Scope of the manual This manual provides information and instructions that will be needed in order to use the 07931-Series Laser in safety instrumented systems. It is aimed at those responsible for planning, designing, installing, commissioning and maintaining safety instrumented systems using the...

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SERVOTOUGH Laser 3 Plus Functional Safety Manual 07931006B_3 - 8

Introduction Product description The 07931-Series Laser is an advanced gas monitor. It comprises a Transmitter Unit (TU) and a Receiver Unit (RU), with an optional AC to DC power supply and ancillary equipment, and sample cell for an extractive system. For continuous in-situ applications, the 07931-Series Laser is installed directly across stacks, ducts and reactors. This manual provides detailed functional safety information for the SERVOTOUGH Laser 3 Plus product. The applicability of this information to the various product configurations is given in the appropriate sections. © Servomex...

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SERVOTOUGH Laser 3 Plus Functional Safety Manual 07931006B_3 - 9

Safety information Demand Mode The safety integrity level claimed for this product is based on usage in a Low Demand mode of operation in a 1oo1 (simplex) architecture, as defined in IEC 61508 Edition 2.0 2010-01. Safety functions The SERVOTOUGH Laser 3 plus is certified suitable for use in safety instrumented systems in respect of hardware safety integrity ONLY, according to IEC 61508 Edition 2.0 2010-04. The usable safety function is defined as: The indication of gas concentration by means of a 4-20mA output to the level of performance specified in the appropriate Functional Safety...

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Boundary of safety system The following aspects of the analyzer are considered to be within the boundary of the safety system covered in this manual: • • • • • • Measurement of the specified gas concentration(s) Optional measurement of ambient pressure as a compensation parameter. Optional measurement of ambient temperature as a compensation parameter. Optional measurement compensation by external current inputs to the Additional Input/Output board. Central processing and control. mA output. The following are considered to be outside the safety boundary and are not covered in this manual: •...

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SERVOTOUGH Laser 3 Plus Functional Safety Manual 07931006B_3 - 11

Product configurations The capabilities of the standard product may be extended with the optional Additional Input/Output board. This adds a mA output to support a second measurement, and two analogue input channels that are able to support measurement compensation by external temperature and/or pressure measurements. It is also possible to configure, through the user interface, pressure compensation by the built-in sensor. This gives rise to the following configurations: Configuration Internal pressure compensation enabled External pressure compensation enabled ✓ ✓ External temperature...

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Failure data. Safety function 1 - This table contains the functional safety data that applies when the safety function is achieved through mA output 1 as fitted to the standard analyzer. Configuration Safety Related Characteristic Device type Hardware fault tolerance Safety integrity level Dangerous detected failure rate Dangerous undetected failure rate Safe failure rate Diagnostic coverage % Safe failure fraction Total failure rate Average probability of failure on demand Safety function 2 - This table contains the functional safety data that applies when the safety function is achieved...

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Safety instructions General observations The 07931-Series Laser must be installed and operated as described in the product manuals and any supporting documentation. Suitable precautions must be taken to ensure that the lens on the analyser are kept clean, such as use of purged gas as described in the product manuals. It is recognised that this analyzer will be used in a variety of applications. It is the user's responsibility to ensure that it is suitable for any particular application and that it is operated within its specification. In particular, any specific conditions laid down in the...

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SERVOTOUGH Laser 3 Plus Functional Safety Manual 07931006B_3 - 14

Settings After installation and commissioning according to the instructions in the product manuals, the following settings MUST be set to support the safety function. Please refer to the Operator Manual for step by step instructions on these settings. Note also that a password will typically be required in this process. mA output settings Any mA output used in a safety function MUST be set to indicate an out-of-range current under fault conditions. This is achieved as follows. Set the mA output range to the 4-20mA option. Ensure that the Underrange current is set to a non-zero value. Set...

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Other Settings For the safety assessment to be valid all settings referenced in the appropriate Functional Safety Product Specification MUST be set as specified. In addition, the following general settings must be set as shown: Purge Compensation: Baseline Subtraction: Baseline subtraction will remove the measurement from the output for validation purposes. Operator MUST ensure that this feature is disabled before returning equipment into service. Protection of settings The 07931-Series Laser is supplied with all passwords set to default values. After configuration these MUST be altered to...

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