| 摘要 |
The invention relates to a separating interface for electrical control line for explosion hazard zones provided with monitoring of control line parameters, such as a short circuit, earth fault, line resistance. In the separating interface for an electric control line configuration according to the invention the control line input 8 with a control contact 7 is connected to a control contact 7 monitoring module 2 and to a control line parameters monitoring module 3 . The control contact 7 monitoring module 2 and the control line 8 parameters monitoring module 3 are installed inside a single housing located in non-hazardous zone. The electrical output circuit of the contact 7 monitoring module 2 comprises at least one contact of a mechanical or electronic relay 4 , whereas the electrical output circuit of the control line 8 parameters monitoring module 3 comprises at least one relay 5 contact and/or electronic contact output and circuits of two-way serial link 6 , for instance of the RS232C, RS485, CANBUS or ETHERNET type. In one embodiment the control contact 7 shunts resistor 9 of a pair of resistors 9 , 10 , in another embodiment of the separating interface configuration the contact 7 is connected in series to a diode reverse biased in relation to the control line 8 , whereas in each of the embodiments the control line 8 , along with the contact 7 , are located in the explosion hazard zone 12 . The interface is powered by an independent power circuit 13 . |
