Pdf design and implementation of an intrinsically safe. The intrinsically safe remote io system is connected to the controller by a simple 2wire or fiber optic link to relay information back and forth. This application can give an indication of the maximum voltage, current, capacitance and inductance to use when designing a circuit to be intrinsically safe for a selected gas subgroup iia, iib or iic. C the pump is started from a batch sequencer program in the plc.
This tool will quickly give an indication of the maximum permissible current for a given voltage or visaversa. This handbook is intended for the understanding of intrinsically safe technology. Premier manufacturers of high quality insulated electrical wire and cable since 1878. Generally is and non is cables are segregated in cable trays duct while laying in the field depending on project specifications. Difference between intrinsic safe and nonintrinsic safe. The safety technique relies on the system being correctly designed and intrinsic safety becomes a system concept.
A wide variety of intrinsically safe calculator options are available to. Specializing in power, control, instrumentation, transmission, distribution, signal. For each cable, the software calculates the following values. Where intrinsically safe apparatus is interconnected by wiring, the safety of each piece of apparatus is affected by the performance of the other pieces of apparatus in the circuit. Select barriers, cable and equipment from drop down menus and this software will conduct all the necessary calculations including the new safety is the intrinsically safe earth. To initiate an intrinsic safety calculation by loop, in the wiring module window, on the. How to calculate an intrinsically safe loop approval. Verification of intrinsic safety co and lo parameters for mixed circuits by thomas eichhorn, ulrich johannsmeyer, anton schimmele the intrinsic safety of an electrical circuit is essentially dependent on the safe limitation of current and voltage, and consequently of the power supplied, so that in neither. The newsletter also contains offers such as free seminars, free software and. Design and implementation of an intrinsically safe liquid. Fundamentally the purpose of the is circuits is to limit the energy going into the field so as to minimize the risk of ignition in hazardous atmosphere. And ci is the capacitance of the sensor selected for use in the hazardous location. Verification of intrinsic safety for measurement and control.
A fuse is present to protect the zener diode as shown in figure 1. Intrinsic safety calculation by loop intergraph smart. Intrinsically safe pulse radar level transmitter the intrinsically safe 26 ghz. In other words, an intrinsically safe system is one with energy levels so low they cannot cause an explosion. This is typically achieved through the use of barriers either zener diode barriers or isolated barriersthat limit energy to a hazardous potentially flammable area. The primary purpose of this calculation is to show that no potential problem of stored energy exists on any intrinsic safe i.