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IECEx Certificate
of Conformity
 
INTERNATIONAL ELECTROTECHNICAL COMMISSION
IEC Certification Scheme for Explosive Atmospheres
for rules and details of the IECEx Scheme visit www.iecex.com
 
Certificate No.:
IECEx BAS 12.0045X issue No.:0

Certificate history:

 
Status:
Current
 
Date of Issue:2012-04-12 Page 1 of 4


    
Applicant:
Servomex Group Limited
Jarvis Brook
Crowborough
East Sussex
TN6 3FB
United Kingdom


 
Electrical Apparatus:Type 2700 Combustion Analyser Sensor Head
Optional accessory:


 
Type of Protection:Purged & Pressurised Enclosure


 
Marking:

Ex pz IIC T3/T2 Gc (Tamb = -20°C to +70°C)

 
Approved for issue on behalf of the IECEx
Certification Body:		R S Sinclair

 
Position:General Manager


 
Signature:
(for printed version)
 
Date:
 
 
1. This certificate and schedule may only be reproduced in full.
2. This certificate is not transferable and remains the property of the issuing body.
3. The Status and authenticity of this certificate may be verified by visiting the Official IECEx Website.
 
 Certificate issued by:
Baseefa
Rockhead Business Park
Staden Lane
Buxton
Derbyshire
SK17 9RZ
United Kingdom


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IECEx Certificate
of Conformity
 
Certificate No.:IECEx BAS 12.0045X
 
Date of Issue:2012-04-12Issue No.: 0
 
Page 2 of 4
 
 Manufacturer:
Servomex Group Limited
Jarvis Brook
Crowborough
East Sussex
TN6 3FB
United Kingdom


 
 Additional Manufacturing location(s):
 

This certificate is issued as verification that a sample(s), representative of production, was assessed and tested and found to comply with the IEC Standard list below and that the manufacturer's quality system, relating to the Ex products covered by this certificate, was assessed and found to comply with the IECEx Quality system requirements. This certificate is granted subject to the conditions as set out in IECEx Scheme Rules, IECEx 02 and Operational Documents as amended.


STANDARDS:
The electrical apparatus and any acceptable variations to it specified in the schedule of this certificate and the identified documents, was found to comply with the following standards:

 
IEC 60079-0 : 2011
Edition: 6.0		Explosive atmospheres - Part 0: General requirements
IEC 60079-2 : 2007-02
Edition: 5		Explosive Atmospheres - Part 2 Equipment protection by pressurized enclosure "p"
 
This Certificate does not indicate compliance with electrical safety and performance requirements other than those expressly included in the Standards listed above.


 
TEST & ASSESSMENT REPORTS:A sample(s) of the equipment listed has successfully met the examination and test requirements as recorded in

 
Test Report:
GB/BAS/ExTR12.0057/00


Quality Assessment Report:

GB/ITS/QAR06.0004/01


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IECEx Certificate
of Conformity
 
Certificate No.:IECEx BAS 12.0045X
 
Date of Issue:2012-04-12Issue No.: 0
 
Page 3 of 4
 
 
Schedule
 
EQUIPMENT:
Equipment and systems covered by this certificate are as follows:
 
The Type 2700 Combustion Analyser Sensor Head comprises a flange mounted twin chamber enclosure designed to be purged and pressurised by a remote control system.  

The main chamber (roughly cylindrical) houses a gas sensor cell and connecting pipework, unions and flame arrestors to draw a sample of gas from the external flue probe by means of aspirated air or nitrogen through the filter block/flange assembly. Additional gas detector cells and/or flow sensing devices may also be optionally fitted to the sample flow pipework assembly.

The incoming sample gas and filter block are heated up to 250°C by means of an heater assembly (element and control thermostat) mounted to the filter block/flange assembly. In addition individual gas sensing elements within the enclosure may reach temperatures of up to 700°C. Flame arrestors are used to prevent any possible ignition within the sensor array from propagating back into the process environment.

A second (roughly rectangular) enclosure is mounted to the side of the main enclosure to house an electronics PCB complete with the user connections and control components. Up to three threaded cable entries are provided in the side of this enclosure.

The unit is designed to be purged and pressurised with air or nitrogen from a separate and suitably certified remote control system which is piped into the terminal enclosure, through the sensor enclosure and then piped out and vented via the same remote control unit. The control system may operate in either a leakage compensation mode or with a continuous flow of the protective gas.

 

 
CONDITIONS OF CERTIFICATION: YES as shown below:
 
1. The external surfaces of the purged and pressurised enclosures are allocated a T3 (200°C) temperature classification based on the maximum specified ambient of 70°C. The filter block (i.e. the internal face of the mounting flange) is allocated a T2 (300°C) temperature classification and is subject to heating by an internal heater element up to 260°C. The user is to ensure that the process/flue mountings do not pose a thermal ignition risk for any potential gas atmosphere.

2. The incoming cables and glands must be suitable for the conditions of use and must be fitted and connected so as to preserve the ingress protection (sealing) of the enclosure.

3. The enclosure is to be purged with air at a flow rate of not less than 5 l/min for a period of not less than 20 minutes when purged in leakage compensation mode, or 3 l/min for a period of not less than 30 minutes when operated in continuous flow mode.

4. The manufacturer shall subject each and every unit to a leakage test at 10kPa. The leakage shall not exceed 10 l/min.  

Continued on Page 4.
 


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IECEx Certificate
of Conformity
 
Certificate No.:IECEx BAS 12.0045X
 
Date of Issue:2012-04-12Issue No.: 0
 
Page 4 of 4
 
 
Additional information:
 

Conditions of Certification continued 

 

5. The pressurisation and purging system attached to the enclosure must be suitably certified and comply with the following :-

a. Provide the minimum purge flow rate for the required time as specified above. Monitoring of the minimum flow rate shall be made on the outlet/vent side of the enclosure (not inlet).

b. Be connected within 100m of the input and output facilities of the enclosure, with no valves or restrictions in the outlet/vent line (other than those necessary for the function and control of the purging system and certified as integral parts thereof).

c. Provide automatic closing and spark arresting devices at the purge outlet aperture.

d. Provide low and high pressure monitoring and control, set to give pressures no less than 50Pa and no greater than 10kPa respectively within the enclosure.

e. The system must protect the enclosure from full line pressure in the event of pressure regulator failure (and any such failure should be self revealing). This may be achieved either by a redundant regulator, or a relief valve on the inlet side of the enclosure capable of venting the full flow.

6.  For correct operation the on-site pressurising air supply must be capable of providing a minimum of 3 l/min for leakage compensation, or continuous flow.

7. The installer or user, as appropriate, is responsible for ensuring that this apparatus and in particular any ancillary apparatus, both inside and outside the apparatus, not included within the provisions of this certificate, is suitable for the conditions of use.  Attention is drawn to the possible lack of alignment of apparatus grouping, temperature classification and other standard requirements between the standards to which the ancillary apparatus may be certified and the standards to which this certificate is issued.

8. The equipment (and associated pipework) may pose a potential electrostatic ignition hazard and should be suitably protected (i.e. earthed/screened and cleaned only with a damp cloth).

9.  Once installed the correct functioning of the equipment and control system assembly shall be tested with regard to the following features :-

a.  Ensure that the enclosure/system leakage is within permitted parameters, at the value specified on the labels, and in all cases less than 10 l/min at 10kPa, i.e. typically 4 l/min at 4kPa.

b.  Ensure that the low pressure monitoring is effective, at the value specified on the label, and in all cases greater than 50Pa within the enclosure.

c.  Ensure that the high pressure control is effective, at the value specified on the label, and in all cases less than 10kPa within the enclosure.

Repeat function testing is recommended periodically following maintenance. Additional function/maintenance tests may be required by the system manufacturer as detailed in the relevant installation/maintenance instructions. 

 

 
 








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