Analog input boards? 4-20 ma , temp sensong
25 Mar 2023 06:49 #267454
by jimmyrig
Analog input boards? 4-20 ma , temp sensong was created by jimmyrig
Looks like mesa has 0-10v analog input covered with the 7i87.
what are the options for 4-20 ma or any temp sensing (rtd, thermocouple, etc).
The only things I'm coming up with are
Rs485 (modbus) to plc with correct cardModbus to Arduino on custom PCB. Resistor to convert 4-20ma circuit to 0-10v for the mesa card......with a temp probe on a 0-10v sending unit..... To pretend the problem doesn't exist and just use the mesa 0-10v :-p ..... However this won't always be an option.
Hopefully I'm missing something simple.
Thanks everyone
what are the options for 4-20 ma or any temp sensing (rtd, thermocouple, etc).
The only things I'm coming up with are
Rs485 (modbus) to plc with correct cardModbus to Arduino on custom PCB. Resistor to convert 4-20ma circuit to 0-10v for the mesa card......with a temp probe on a 0-10v sending unit..... To pretend the problem doesn't exist and just use the mesa 0-10v :-p ..... However this won't always be an option.
Hopefully I'm missing something simple.
Thanks everyone
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25 Mar 2023 10:56 #267462
by tommylight
Replied by tommylight on topic Analog input boards? 4-20 ma , temp sensong
THCAD can be used for Voltage from 5 , 10 and 300V full scale.
But since inside it measures current, it can be made to read that too, or temperature, or whatever.
If you want to fiddle, there is a small DIP8 chip that does voltage to frequency or vice versa, LM331 i think, not sure.
Also, the THCAD is fully isolated and can handle 500V indefinitely on the inputs.
But since inside it measures current, it can be made to read that too, or temperature, or whatever.
If you want to fiddle, there is a small DIP8 chip that does voltage to frequency or vice versa, LM331 i think, not sure.
Also, the THCAD is fully isolated and can handle 500V indefinitely on the inputs.
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