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7 CERTIFICATE OF CONFORMITY No. TC RU С- DE.AB72.B Series RU No CERTIFICATION AUTHORITIES Certification authority of products of "Scientific and Technical Center "Techno-standard Limited Liability Company. Location (address of legal entity) and address of place of business activity: , Russian Federation, Moscow, Ryazansky Prospekt, House 24, Building 2. Phone: ; Fax: Accreditation certificate number RA.RU.11АВ72, registration date of the accreditation certificate: APPLICANT VIKA MERA Joint Stock Company. Location (address of legal entity): , Russian Federation, Moscow, Settlement Sosenskoye, village of Nikolo-Khovanskoye, possession 1011A, building 1, floor/office 2/2.09. Address of place of business activity: Russian Federation, Moscow, Settlement Sosenskoye, village of Nikolo-Khovanskoye, possession 1011A, building 1. OGRN , Phone: MANUFACTURER WIKA Alexander Wiegand SE & Со. KG. Location (address of legal entity) and address of the place of manufacturing: The Federal Republic of Germany, Alexander- Wiegand-Strasse 30, Klingenberg. Branch of the manufacturer factory: KSR KUEBLER Niveau-Messtechnik AG. Location (address of legal entity) and address of the place of manufacturing: The Federal Republic of Germany, Heinrich-Kuebler-Platz Zwingenberg PRODUCTS Level switches (accessories for level indicators, BNA level meters, UTN) BGU with 1Ех d IIС T6...T3 Gb X and 0Ех ia IIС Т6...ТЗ Ga X explosion proof marks, (see Annexes - forms No , , , ) manufactured according to Directive 2014/34 / EU "Equipment used in explosive atmospheres" and technical documentation of the manufacturer factory LM Serial production CODE of Foreign Trade Goods Classification of the Customs Union MEETS REQUIREMENTS CU TR 012/2011 "On the safety of equipment for work in explosive atmospheres" CERTIFICATE ISSUED BASED ON Test Reports No. 2603Ex, No. 2604Ex dated 06/20/2018, the testing laboratory of Joint-stock company "Scientific Research Center "TEHNOPROGRESS", the registration number of accreditation certificate RA.RU.21TP16; the Act of Production Audit No. АВ /АА dated March 29, 2018, Operation manuals LCIE 01АТCХ6047 X. Certification scheme: 1с ADDITIONAL INFORMATION Operating life is not less than 24 years. Storage conditions 3 LA (living area) (according to GOST section 10), storage life without represervation is 3 years. Standards that result in voluntary compliance with the requirements of CU TR 012/2011: (see Annexes - form No ) TERM OF VALIDITY FROM 06/26/2018 TO 06/25/2023 INCLUSIVE [Seal] The head (authorized person) of the certification authority Seal here Expert (expert-auditor) (experts (experts-auditors)) Abitova Taliya Shaikhievna Fadekov Viacheslav Nikolayevich

8 ADDENDUM 1 TO CERTIFICATE OF CONFORMITY No. ТС RU C-DE АВ72 В Series RU No Information On The Certificate Of Conformity 1. Purpose and Scope Level switches (accessories for level indicators, BNA level meters, UTN) BGU are designed for use in various industries for controlling of liquids level. Level switches (accessories for level indicators, BNA level meters, UTN) BGU (hereinafter referred to as BGU level switches) belong to explosion-proof equipment of group II according to GOST (IEC :2011) and are intended for use in hazardous areas of premises and external installations of Class 1 for the execution of products with the type of protection "flameproof enclosure "d" and classes 0, 1 or 2 for execution of products with type of protection "intrinsically safe circuit of the level "ia", according to the assigned explosion proof marking. 2. Main Specifications Table 1 Parameter Explosion proof marking*: - for execution: Ex d - for execution: Ex ia Ambient temperature range in operating conditions, С: - for temperature class T3 - for temperature class T4 - for temperature class T5 - for temperature class T6 Value, units 1Ех d НС Т6...ТЗ Gb X ОЕх ia НС Т6...ТЗ Ga X -50 Та Та Та Та +75 Intrinsically safe circuit parameters Ex ia: - maximum input voltage Ui, V - maximum input current li, ma - maximum input power Pi, W - maximum internal capacitance Ci, nf - maximum internal inductance Li, mh Capacity of Ex d terminals: - AC voltage, V - AC current, A - AC power, VA - DC voltage, V - DC current, A - DC power, V negligible negligible [Seal] Seal here The head (authorized person) of the certification authority Abitova Taliya Shaikhievna Expert-auditor (expert) Fadekov Viacheslav Nikolayevich

9 ADDENDUM 2 TO CERTIFICATE OF CONFORMITY No. TC _ RU C-DE АВ72 В Series RU No Information On The Certificate Of Conformity Ingress protection provided by enclosure of electrical equipment according to GOST (IEC 60529:2013): - for execution: Ex d - for execution: Ex ia IP68 (1.5 m, 40 minutes) IP65 The specification of materials used, as well as other characteristics of the BGU level switches, are given in the manufacturer's technical and operational documentation. * The temperature class of instruments is determined by the ambient temperature and the temperature of working medium (process) according to manufacturer's technical documentation. 3 Description Of Design And Means Of Ensuring Explosion Protection 3.1 Design description: BGU level switches are proximity switches, set on level indicators, BNA and UTN series level meters without immersion in controlled environment and serve for switching of connected control circuits. The setting of the switches is carried out by means of a clamp or a T-shaped groove on a magnetic indicator or on a pipe of a level indicator, a level meter. The main components are the enclosure and hermetically sealed contacts (reed switches) built into it. Reed switches are triggered when interacting with the magnetic field of a permanent float magnet of level indicators, BNA series level meters or a magnetic level indicator system, UTN series level meters. BGU level switches generate threshold levels in the bypass level indicators. They create a binary signal that can be sent to an alarm or control device s input located after the switches. To save signals there are switches with two stable states Explosion protection of BGU level switches is provided by explosion protection of the type "flameproof enclosure "d" according to GOST IEC , type of protection "intrinsically safe circuit of the level "ia" according to GOST (IEC :2011) and their design in accordance with the requirements of GOST (IEC :2011). Explosion protection of BGU level switches of Exia performance is provided by the following factors: - limitation of current, voltage, capacitance and inductance in electrical circuits up to intrinsically safe values; - limitation of energy in the circuit and its ingress protection to such an extent that the electric discharge in the circuit or its heating can not ignite the environment; - execution of the product design according to the requirements of regulatory documents that establish requirements for explosion-proof equipment; [Seal] Seal here The head (authorized person) of the certification authority Abitova Taliya Shaikhievna Expert-auditor (expert) Fadekov Viacheslav Nikolayevich

10 ADDENDUM 3 TO CERTIFICATE OF CONFORMITY No. TC RU С-DЕ АВ72-.В: Series RU No Information On The Certificate Of Conformity -products do not contain moving parts and mechanisms capable of friction, leading to an increase in temperature of their surfaces above the permissible values; -BGU level switches are tested to confirm the electrical strength of the insulation. Explosion protection of BGU level switches of Exd performance is provided by the following factors: -electric parts are enclosed in a flameproof enclosure that withstands the explosion pressure and excludes the transmission of the explosion into the surrounding explosive atmosphere; - the strength of the flameproof enclosure, parameters of flameproof connections, characteristics of the materials used comply with the requirements of GOST IEC Safe operation of the product can be ensured only during operation and maintenance according to the requirements of the operating manual. 4. Labeling The labeling applied to the level switches must include the following data: - name of manufacturer or its registered trademark; - designation of the type of product; - serial number; - date of manufacture; - explosion proof mark; - special explosion proof mark according to CU TR 012/2011; - name of certification authority and the number of the certificate of conformity. Product labeling may include additional information if it is required by technical and regulatory documentation and which is relevant for their safe use. 5. Special Conditions For The Safe Use Of Equipment The "X" mark in the explosion proof marking means that the following special operating conditions must be observed: 5.1. The level switches must be operated in the ambient temperature range specified in the operating documentation The temperature class of the level switches is determined by the ambient temperature according to the manufacturer's technical documentation Installation, operation, maintenance of the level switches should be carried out according to the manufacturer's instructions on its technical documentation; 5.4. If aluminum level switches are used to avoid the risk of ignition from sparks caused by friction or impact of details, when installing and operating the products in question, it is not allowed to expose level switches to friction or shock, which may cause sparking. [Seal] Seal here The head (authorized person) of the certification authority Abitova Taliya Shaikhievna Expert-auditor (expert) Fadekov Viacheslav Nikolayevich

11 ADDENDUM 4 TO CERTIFICATE OF CONFORMITY No. ТС RU C-DE AB72.B Series RU No Information On The Certificate Of Conformity 5.5. Painted surfaces of the level switches should only be wiped with a damp cloth to avoid the risk of static stress accumulation on them The user must comply with the assigned operating life of the level switches, during which the safety parameters of the explosion protection specified by the manufacturer in the operating documentation are safeguarded. 6. The manufacturer can make changes in the design and technical documentation that confirms the conformity of the products to the requirements of CU TR 012/2011, which affect the indicators of explosion-proof level switches, only by agreement of the OSP "Techno-standard LTD. [Seal] Seal here The head (authorized person) of the certification authority Abitova Taliya Shaikhievna Expert-auditor (expert) Fadekov Viacheslav Nikolayevich

12 ADDENDUM 5 TO CERTIFICATE OF CONFORMITY No. ТС RU С-DE.АВ Series RU No Information On The Certificate Of Conformity Standards that result in voluntary compliance with the requirements of CU TR 012/2011: GOST (IEC :2011) "Explosive atmospheres. Part 0. Equipment. General requirements"; GOST IEC "Explosive atmospheres. Part 1. Equipment with explosion protection of the type "flameproof enclosure "d"; GOST (IEC :2011) "Explosive atmospheres. Part 11. Equipment with explosion protection of the type "intrinsically safe circuit "i". [Seal] Seal here The head (authorized person) of the certification authority Abitova Taliya Shaikhievna Expert-auditor (expert) Fadekov Viacheslav Nikolayevich

Certificate of Compliance

Certificate of Compliance Certificate: 70033893 (166720) Issued to: WIKA Alexander Wiegand SE & Co. KG Alexander-Wiegand-Str 30 Klingenberg, 63911 GERMANY Attention: Uwe Schmidt The products listed below