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Safety Barriers

Safety Barriers
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2 Safety Barriers Safety Barriers Series 9001, 9002, 9004 ● Complete product range for all standard applications ● Flexible and space saving single and dual channel versions on 12 mm only ● Reduced inventory due to uniform exchangeable fuse ● Installation in Zone 2 and Division 2 possible 09964E00 Safety barriers are used to connect intrinsically safe (Ex i) circuits with non-intrinsically safe circuits. The barriers limit the electrical energy towards the hazardous area by means of a combination of Zener diodes, resistors and fuses. Safety barriers featuring an extremely broad application area. 2/1 Automation 18.11.2009

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2 Safety Barriers Series 9001, 9002, 9004 Advantages at a Glance: If single or dual channel, the safety barriers offer a low cost and space saving solution on 12 mm foot print. The transparent cover offers sufficient space for labeling. 04102E00 Snapping-on mounts the barrier mechanically, it simultaneously establishes the PE connection. Therefore only one common PE connection is needed per DIN rail. Time and energy-intensive wiring is dispensed with, however, manual wiring is still an installation option. Even if other rails are used, adapters guarantee that the safety barriers possess a...

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2 Safety Barriers Series 9001, 9002, 9004 Introduction Application Safety barriers are used as economical interfaces without galvanic isolation between intrinsically safe and non-intrinsically safe circuits. They protect circuits (i. e. cable and apparatus) in hazardous locations. Safety barriers are so-called associated apparatus: Since they also contain non-intrinsically circuits they must either be installed in the safe area or if certified in Zone 2 / Division 2. The combination with an further type of explosion protection (e.g. flame proof enclosure) enables the installation in Zone 1....

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2 Safety Barriers Series 9001, 9002, 9004 Selection Criteria - Function and Safety Selection of safety barriers is generally carried out in two steps: • Functional consideration • Safety consideration 1. Functional consideration Safety barriers are first selected according to their electrical requirements. It is therefore necessary to know the electrical data of the connected apparatus. Further selection criteria: • Polarity of the voltage at the safety barrier UN (+, -, ~) in reference to ¿/PA • Voltage UN • Max. permissible voltage drop across the barrier, caused by the line resistance RL...

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2 Safety Barriers Series 9001, 9002, 9004 Selection Criteria - Function and Safety 2. Safety consideration The safe maximum values of an individual safety barrier (single- or dual-channel) are determined by the certification: • Maximum voltage Uo • Maximum current Io • Maximum power Po • Maximum permissible capacity Co • Maximum permissible inductance Lo It is to be tested however, if the permissible safe maximum values of the intrinsically safe apparatus (field apparatus in the hazardous area) are maintained by the selected safety barrier. 09938E02 Interconnection of Safety Barriers If...

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2 Safety Barriers Series 9001, 9002, 9004 Interconnection of Safety Barriers Addition possibilities Example: I = current addition U = voltage addition When interconnecting two safety barriers for alternating potential I + U results, thus a current addition as well as a voltage addition is to be taken into consideration. Polarity - + ~ - I U I and U + U I I and U ~ I and U I and U I and U The EN 60079-11, table A.1 contains the permissible value pairs / combinations of permissible maximum safe values for: • Voltage Uo • Current Io • External capacitance Co The following procedure is to be...

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2 Safety Barriers Series 9001, 9002, 9004 Installation and Grounding R. STAHL safety barriers Series 9001, 9002 and 9004 excel due to an especially simple mounting mechanism. They snap on to a 35 mm DIN rail (NS35/15 to EN 50 022) directly without a mounting attachment. At the same time a conducting connection between ¿ / PA of the barrier and the rail, is established. Grounding several barriers is achieved by connecting the rail with the potential equalisation / grounding system (collective ground). The safety barriers can alternatively be grounded individually as well by using the ¿ / PA...

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2 Safety Barriers Series 9001, 9002, 9004 Exchangeable Back-up Fuse All safety barriers Series 9001, 9002 and 9004 have an exchangeable back-up fuse. Dual-channel safety barriers have a back-up fuse per channel. This fuse backs up the internal, non-accessible fuse. A protective circuit prevents tripping of both fuses at the same time. It is thus ensured that the safety barrier is protected against destruction resulting from reverse polarity of the operating voltage or excessively high operation voltages. Two advantages are essential for maintenance and repair: • in case of overload the...

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2 Safety Barriers Series 9001, 9002, 9004 Overview application Safety Barrieres Symbol Application 2-, 3-wire transmitter INTRINSPAK Type 9002/13-280-110-001 9001/51-280-091-141 06861E00 2-wire transmitter HART 9002/13-280-110-001 9001/51-280-091-141 06329E00 4-wire transmitter, current source Field circuit floating 9002/34-280-000-001 4-wire transmitter HART Field circuit floating 9002/34-280-000-001 07648E00 07649E00 i/p converter, control valve, indicator Field circuit grounded 9001/01-280-110-101 9002/13-280-110-001 07650E00 i/p converter, HART control valve Field circuit grounded...

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Safety Barriers Series 9001, 9002, 9004 Overview application Safety Barrieres Thermocouple, mV signals Field circuit floating 9002/77-093-300-001 06332E00 Resistance thermometer (RTD), Potentiometer Pt100, 2-wire connection Field circuit floating Pt100, 3-wire connection Field circuit floating Pt100, 4-wire connection Field circuit floating 9002/22-032-300-111 9002/22-032-300-111 9002/22-032-300-111 9002/77-093-040-001 06331E00 Strain gauge load cells 350 O or 700 O 6-wire ± 7.5 V (15 V) Field circuit floating 9002/10-187-270-001 9002/10-187-020-001 9002/77-093-040-001 350 O 6-wire + 10 V...

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