I have an Endress+Hauser PTC31 Pressure Transmitter.

I have tried various permutations and cannot get this to work on the AI card.

There is 24vDC wired to AI card terminal L+ and a negative 0v wired to pin 'M'

I am using channel 1, which is the 0+ and 0-

Its is these channels and any associated +ve & -ve links that need to wired correctly.

For those not familiar with this type of pressure transmitter, i have attached an image