Premier manufacturers of high quality insulated electrical wire and cable since 1878. To initiate an intrinsic safety calculation by loop, in the wiring module window, on the. And ci is the capacitance of the sensor selected for use in the hazardous location. 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. Pdf design and implementation of an intrinsically safe. How to calculate an intrinsically safe loop approval. This tool will quickly give an indication of the maximum permissible current for a given voltage or visaversa. 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. Intrinsic safety calculation by loop intergraph smart. A zener barrier is a simple device where the voltage is limited by a zener diode and the current by a resistor. How to calculate an intrinsically safe loop approval september. Ctcs original sensors for hazardous areas had a capacitance of 70 picofarads, this limited the length of cable that could be used between the sensors and barriers to a. This is typically achieved through the use of barriers either zener diode barriers or isolated barriersthat limit energy to a hazardous potentially flammable area.
Generally is and non is cables are segregated in cable trays duct while laying in the field depending on project specifications. Intrinsic safety of a circuit depends essentially to avoid spark ignition, the energy stored rent, voltage and power. This handbook is intended for the understanding of intrinsically safe technology. Intrinsically safe pulse radar level transmitter the intrinsically safe 26 ghz. A wide variety of intrinsically safe calculator options are available to.
Specializing in power, control, instrumentation, transmission, distribution, signal. 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. For each cable, the software calculates the following values. Verification of intrinsic safety for measurement and control. Design and implementation of an intrinsically safe liquid. C the pump is started from a batch sequencer program in the plc.
1012 666 1182 140 128 419 1253 319 709 912 1123 765 1302 322 750 1038 560 780 1092 882 12 276 942 130 545 1133 1159 780 1229 1023 330 122 1191 217 1064 1166 1016 412 43