Intrinsically safe concepts and standards summary pdf white paper, aegex technologies. Intrinsically safe relays, such as the ny2 and the class 8501 type to relays, act as an energy barrier, limiting the voltage and current. Figure 1 is a simplified example of a system control drawing. Usb intrinsic safety barrier product description 201901 7 2 product description. Barriers asat w ork relay output explosion protection intrinsic safety type iec compliant exia ii c degree ofprotection ip20 iec60529 installation location relay barrier safe indoor place nonhazardous area switch for zone 0, 1, 2 hazardous areas non intrinsically safe circuit maximum voltage um ac 5060hz, 250v dc intrinsically safe. Each barrier contains a replaceable 160ma fuse which protects the barrier from pole reversal and voltage spikes at the input side. This is typically achieved through the use of barriers either zener diode barriers or isolated barriers that limit. Intrinsically safe and nonincendive systems apparatus listed as a system are easier to install since all aspects of the installation are defined on the control drawing provided with the equipment. By limiting energy to a safe level, intrinsically safe circuits prevent the ignition of potentially explosive atmospheres. These barriers are energy limiting and utilize zener diodes which direct voltage spikes to ground.
Install these barriers in your safe area to limit the current to the hazardous environment, and ensure voltage remains at an intrinsically safe level. Bulletin 937 intrinsic safety modules rockwell automation. These barriers are not appropriate for use with ctcs standard intrinsically safe accel. As any intrinsic safety equipment, the zener barrier allows cables to short circuit to each other. Intrinsic safety barrier cut sheet safe fire detection. Intrinsic safety barriers are used in hazardous installations to prevent accidental ignition of flammable materials. This isolated barrier is used for intrinsic safety applications. Pdf electrical equipments destined to operate in potentially hazardous environments are externally connected through intrinsic safety barriers. As its name implies, intrinsic safety refers to equipment and. In other words, an intrinsically safe system is one with energy levels so low they cannot cause an explosion. This intrinsic safety barrier module is the perfect complement to our intrinsically safe encoders and, when used together, constitutes a completely engineered solution for encoder operation in class i and class ii, division 1 zone 0 hazardous environments. This simplifies maintenance and repair of ex i circuits. Our most popular intrinsic safety isolated barriers are the flexible din rail mounted ksystem modules.
The skpcz1d1uu110hs usb intrinsic safety barrier enables a host device i. Series mtl77067787 zener barriers intrinsically safe. Installation of intrinsically safe and nonincendive. Intrinsic safety is is a protection technique for safe operation of electrical equipment in. Intrinsically safe signal conditioners for hazardous area applications b. Pdf study of the operating states of intrinsic safety barriers of the. This single barrier provides both power and signal isolation for an incremental encoder. This board is designed for atex applications for communication e. Each barrier contains a replaceable 160ma fuse which protects. It transfers digital signals namur sensorsmechanical contacts from a hazardous area to a safe area.710 106 686 624 675 1507 1355 1466 981 886 40 1023 974 155 1529 1543 240 430 1220 283 584 1441 301 699 889 1141 1366 427 1111 1387 28 110 849 277 374 469 316 1272 595