| 摘要 |
FIELD: electricity.SUBSTANCE: system for spark-proof power supply to measurement sensors is intended for connection of sensors with high self-capacitance, which are located in an explosion hazard zone. The system includes spark-proof direct-current sources with different output voltages and spark protection barriers, clamps of one polarity of power sources are connected to a common point, feed circuits of the sensors, which are made on voltage stabilisers, are shunted with suppressors, for communication to informative main outputs of sensors there used is a receiving-transmitting device separated from recording equipment with an optoelectronic isolator.EFFECT: possibility of parallel connection of several sensors has been obtained due to the fact that to a feed circuit of each of the parallel connected sensors there introduced are in-series chains of diodes from one to three, the number of which is determined by an explosion protection level, each of the two informative outputs of the sensors is shunted to a common bus of power sources with one, two or three suppressors, the number of which is determined by the explosion protection level, and the receiving-transmitting device with an optoelectronic isolator is fed from a spark-proof chain of the corresponding power source with a spark protection barrier.1 dwg |
