Safety instructions Overvoltage protection B81-35

Transcription

1 Safety instructions Overvoltage protection B81-35 IECEx BVS X Intrinsic safety Document ID: 51001

2 Contents 1 Area of applicability General information Technical data Application conditions Protection rating Protection against static energy Installation/construction Grounding Isolation voltage against earth, test of the dielectric strength... 7 Please note: These safety instructions are part of the operating instructions: Overvoltage arrester Certificate of Conformity IECEx BVS X Editing status: Overvoltage protection B81-35

3 1 Area of applicability These safety instructions apply to the overvoltage arresters B81-35 according to the IEC Certiificate of Conformity IECEx BVS X (certification number on the type label). 2 General information The instrument of the overvoltage arrester B81-35 is suitable as overvoltage protection of intrinsically safe circuits with the protective level Ex ia [ia Ga] of instrument category EPL-Ga the protective level Ex ia [ia Da] of instrument category EPL-Da the protective level Ex ia of instrument category EPL-Ga or EPL-Da the protective level Ex ib of instrument category EPL-Gb or EPL-Db the protective level Ex ic of instrument category EPL-Gc or EPL-Dc The overvoltage arresters B81-35 based on a gas discharge tube are suitable for installation in certified intrinsically safe VEGA instruments, the sensor circuit of which leads to areas requiring EPL-Ga or EPL-Da instruments. The overvoltage arresters B81-35 for protection of intrinsically safe circuits with protective level Ex "i" of EPL-Ga/Gb, EPL-Gb or EPL-Gc, EPL-Da/Db, EPL-Db or EPL-Dc instruments take over the task of limiting transient overvoltages, as necessary overvoltage protection systems acc. to IEC or IEC When mounted, the overvoltage arresters B81-35 are suitable as intrinsically, electrical instrument for use in hazardous areas of all combustible substances of explosion group IIA, IIB and IIC, for applications requiring EPL-Ga, EPL-Gb or EPL-Gc instruments. The atmospheres can be also combustible gases, fog or vapours. When mounted, the overvoltage arresters B81-35 are suitable as intrinsically, electrical instrument for use in hazardous areas of all combustible dusts of explosion group IIA, IIB and IIC, for applications requiring category EPL-Da, EPL-Db or EPL-Dc instruments. The overvoltage arresters B81-35 are suitable for protection of certified intrinsically safe VEGA instruments in two-wire version with the following signal transmission: Analogue version 4 20 ma current output 4 20 ma current output with superimposed HART protocol Digital version Profibus PA Foundation Fieldbus Modbus and Levelmaster protocol If the overvoltage arresters B81-35 are used for protection of intrinsically safe signal circuits, then the general installation regulations for explosion protection, IEC , as well as these safety instructions and the operating instructions manual must be observed. The installation of explosion-endangered systems must always be carried out by qualified personnel. Installation in EPL-Ga/Gb instruments The overvoltage arresters B81-35 are suitable for installation in instrument for installation in hazardous areas (Zone 1), requiring an EPL-Ga/Gb instrument. The electronics housing is in the area (Zone 1) requiring EPL-Gb instruments. The sensor circuit leads into an area (Zone 0) requiring EPL-Ga instruments. Installation in EPL-Ga instruments As EPL-Ga instrument, the overvoltage arresters B81-35 are only used as additional protec- Overvoltage protection B

4 tion of the electronics. The installation in EPL-Ga instruments does not meet all requirements of IEC chapter 16.3 (edition 2013). A suitable overvoltage arrester must be connected as close as possible at the entry in the installation location with EPL-Ga. The safety instructions of the respectively connected overvoltage arrester are valid. Installation in EPL-Gb instruments The overvoltage arresters B81-35 are suitable for installation in hazardous areas requiring an EPL- Gb instrument. Installation in EPL-Gc instruments The overvoltage arresters B81-35 are for installation as protection of the electronics of instruments in hazardous areas, requiring an EPL-Gc instrument. Installation in EPL-Da/Db instruments The overvoltage arresters B81-35 are suitable for installation in instrument for installation in hazardous areas (Zone 21), requiring an EPL-Da/Db instrument. The electronics housing is in the area (Zone 21) requiring EPL-Db instruments. The sensor circuit leads into an area (Zone 20) requiring EPL-Da instruments. Installation in EPL-Da instruments As EPL-Da instrument, the overvoltage arresters B81-35 are only used as additional protection of the electronics. The installation in EPL-Da instruments does not meet all requirements of IEC chapter 16.3 (edition 2013). A suitable overvoltage arrester must be connected as close as possible at the entry in the installation location with EPL-Da. The safety instructions of the respectively connected overvoltage arrester are valid. Installation in EPL-Db instruments The overvoltage arresters B81-35 are suitable for installation in hazardous areas requiring an EPL- Db instrument. Installation in EPL-Dc instruments The overvoltage arresters B81-35 are for installation as protection of the electronics of instruments in hazardous areas, requiring an EPL-Dc instrument. Labelling IEC , IEC , IEC Ex ia [ia Ga] IIC T6 T1 Gb Ex ia IIC T6 T1 Ga Ex ib IIC T6 T1 Gb Ex ic IIC T6 T1 Gc Ex ia [ia Da] IIIC T135 C Db Ex ia IIIC T135 C Da Ex ib IIIC T135 C Db Ex ic IIIC T135 C Dc 4 Overvoltage protection B81-35

5 3 Technical data Overvoltage arrester B81-35 Power supply and signal circuit: (terminals 1[+], 2[-]) Power supply and signal circuit: (plug connection) Ignition protection type intrinsic safety Ex i IIC, IIIC U 40 V DC i I 131 ma i or for use in intrinsically safe FISCO fieldbus instruments U 17.5 V DC i I 500 ma i P 5.5 W i C = negligibly small i L = negligibly small i DC response voltage 600 V, -20 %/+35 % Impulse response voltage 850 V at 100 V/µs, 1100 V at 1000 V/µs For connection to an intrinsically safe circuit U = U of the certified, intrinsically safe voltage supply I = I of the certified, intrinsically safe voltage supply P = P of the certified, intrinsically safe voltage supply C = C of the certified, intrinsically safe voltage supply L = L of the certified, intrinsically safe voltage supply 4 Application conditions Permissible ambient temperatures depending on temperature class EPL-Ga instrument Temperature class T C T C T4, T3, T2, T C Overvoltage protection B81-35 Permissible ambient temperature on the electronics The pressure of explosive mixtures must be between bar in applications requiring EPL-Ga instruments. The permissible operating temperatures without hazardous atmosphere are specified in the respecitive manufacturer information, for example the operating instructions. EPL-Gb instrument Temperature class T C T5, T4, T3, T2, T C Permissible ambient temperature on the electronics The permissible operating temperatures without explosion-endangered atmosphere are mentioned in the respective manufacturer instructions, e.g. operating instructions manuals. 5

6 EPL-Gc instrument Temperature class T C T5, T4, T3, T2, T C Permissible ambient temperature on the electronics The permissible operating temperatures without explosion-endangered atmosphere are mentioned in the respective manufacturer instructions, e.g. operating instructions manuals. In mounted condition, the respective temperature classes and permissible ambient temperatures of the VEGA instrument and the overvoltage arrester B81-35 must be taken into account and maintained. EPL-Da, EPL-Db, EPL-Dc instrument Permissible ambient temperature: C Max. surface temperature increase: negligible 5 Protection rating For applications in hazardous areas, overvoltage arrester B81-35 must be mounted in a suitable housing with min. protective level IP 20 acc. to IEC For applications in dust-explosive areas, overvoltage arrester B81-35 must be mounted in a suitable housing with min. protective level IP 5X acc. to IEC When mounted, the protection is determined by the respective VEGA instrument. The specifications in the operating and safety instructions of the respective VEGA instrument are applicable. 6 Protection against static energy In mounted condition and without outer parts of the overvoltage arrester, the instructions of the respective VEGA instruments of the manufacturer specifications, e.g. the operating instructions must be taken into account. 7 Installation/construction The overvoltage arresters B81-35, as far as required, must be only used in the VEGA housing with respective meachnical connection on the terminals of the signal and supply circuit. 8 Grounding To ensure the function of the overvoltage arrester, it is absolutely necessary to connect the overvoltage arrester B81-35 with the local potential equalization. For this purpose, the green-yellow protective ground cable must be connected via the cable lug to the ground cable inside the VEGA housing. The cable lug must be secured by means of screw connection and retaining ring. The outer ground terminal of the VEGA instrument must be connected acc. to IEC chapter 16.3 (edition 2013) to the local potential equalization. 6 Overvoltage protection B81-35

7 Overvoltage arrester B Green-yellow protective ground cable with cable lug 3 Internal ground terminal 9 Isolation voltage against earth, test of the dielectric strength The intrinsically safe input/output circuit is ground-free. The breakdown voltage of the overvoltage arrester B81-35 between intrinsically safe circuit and ground terminal is less than 500 V AC due to construction reasons. With a metrological test of the absence of ground of intrinsically safe circuits against ground acc. to IEC , the overvoltage arrester must be removed. Overvoltage protection B

8 Printing date: All statements concerning scope of delivery, application, practical use and operating conditions of the sensors and processing systems correspond to the information available at the time of printing. Subject to change without prior notice VEGA Grieshaber KG, Schiltach/Germany 2016 VEGA Grieshaber KG Am Hohenstein Schiltach Germany Phone Fax