Nicklamp Posted July 27, 2020 Report Share Posted July 27, 2020 Hi i try to connect this transmiter https://store.clarksonlab.com/HI8936C.aspx . it has the following terminal. 1. 20+ vdc 2. com 3. com 4. 4-20ma. 1and 2 is the power supply and 4-20 should go in the analog input. plc and transmiter have the same power supply. i get no signal. I can measure 4-20 ma between +20 vdc and 4-20 ma at the transmiter. samba has 37 Ω resistance analog input and this transmiter is max 500 Ω output should i use a 500 Ω resistance connected in series? thank you in advace! Quote Link to comment Share on other sites More sharing options...
AlexUT Posted July 27, 2020 Report Share Posted July 27, 2020 Unitronics Analog Inputs are sinking and use 0V as common. Sensor you refer require external power, so it is sinking as well. To connect to Unitronics Analog Inputs, you have to use special adapter/transmitter/current loop repeater. May be Forum Members used such devices in projects. B.R. Quote Link to comment Share on other sites More sharing options...
Nicklamp Posted July 27, 2020 Author Report Share Posted July 27, 2020 Thank you very much! Quote Link to comment Share on other sites More sharing options...
MVP 2023 Joe Tauser Posted July 28, 2020 MVP 2023 Report Share Posted July 28, 2020 Ahh, one of the Hanna products. I used to sell them and got bit by the same problem you're having. Double sinking signals. You'll need a loop isolator to interface this product. Joe T. Quote Link to comment Share on other sites More sharing options...
Nicklamp Posted July 28, 2020 Author Report Share Posted July 28, 2020 Thanks for your reply. So helpful! thank you. Quote Link to comment Share on other sites More sharing options...
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