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TIDA-010044: At the Output I want to trigger a relay if the sensing current is between 4mA-20mA

Part Number: TIDA-010044

From the output Line of the " In1_Status", I want to check whether the Input sensor reading current is 4-20mA. if 4mA<In1_Status<20mA, then trigger a Relay. The relay will switch between NO and NC. Can I do this ? if so please share the schematic.



  • Hello,

    I'm not sure which 4-20mA signal is referred to here. NAMUR current signal is very low ( 1 to 4 mA in normal operation). it is not a 4-20mA transmitter.

    However, if the question is how to trigger a relay only in normal operation, then that would require a logic circuit to generate 1 on the specific case of:

    STATUS=0, FAULT=1, SHORTERR=1, POWFAIL=0 , which is simply FAULT+SHORTERR+POWFAIL'+STATUS' , this can be possibly implemented using a single multi-input logic gate.

    This signal to be used as control signal for the Relay. as the relay is already isolated, no need to pass the isolation barrier.

    details of signal levels (if level shift is needed) and schematic of relay connectivity is dependent on the realy chosen. please check the D/S of the relay you going to use for the required connectivity and signal levels.

    Best Regards,