Hello, I need to pick up a mV signal from a load cell summing box to a ControlLogix IF16 card. Right now the range of the summing box is .005 V when the tank is empty to about .023 V when full. This range is adjustable by raising or lowering the excitation voltage to the summing box.

I'd thought about setting up the analog channel for 0-5V, but I doubt this is going to give me any usable resolution. Is there a device out there that will convert a mV signal to a 4-20mA signal?

Thanks,
~Ryan

See links below for a few choices, there are many more.

http://www.miinet.com/products/sg_temperature.shtml

http://www.actionio.com/

http://www.automationdirect.com/adc/Shoppi...ditioners/FC-T1

Edit: corrected wrong link.

I'm not sure that the PanelView 300 Micro Cutout Template will help me out, but the other two links did.

Thanks,

~Ryan

Sorry about that it should have been, Moore Industries ( my personal favorite).

I have to clean-up desktop.

http://www.miinet.com/products/sg_temperature.shtml

Try also

http://www.api-usa.com/signalconditioners_dc_input.php

The correct thing to do is to use the right card. That would be thermocouple card. I know it sounds strange but read the manual on them. This really is the right card for reading load cells. You just program it for millivolt input instead of doing conversions to temperature. If you don't want to "waste" extra inputs, then check out the Universal analog input card from Spectrum, 1756sc-IF8U. Works just like an IF8I except that every port can be programmed to be any type of analog input you need, unlike AB's relatively limited choices. Only trouble with it used to be the strange configuraiton gyrations but these days with AOP's, that's no longer an issue. The other trouble is relatively low density compared to the IF16, but it's better than the IF6I that AB sells.