Hi,

We would like to replace our dP measurements for a venturi flow measurement. There are 4 measurement venturi's in a reaction zone measuring the air flow to 4 reactors. It is difficult to connect these new systems with our old DCS system.

Would the following be possible?

- a new dP transmitter on each venturi which has an integrated controller to control the air damper. the set point in m³/h is send to the transmittor/controller (wireless or 4-20mA) from our DCS system.
Is there industrial equipment available to do this (Emmerson, Honeywell,...)

Thanks in advance!

best regards,

What and why are things like an analog 4-20 DP transmitter and a damper acutator positioner difficult to connect to your old DCS'? Isn't the wiring already in place?

I'm told Foundation Fieldbus (FF) devices have a PID function block. But when you do things with FF, all the pieces have to be FF: field instrument, valve positioner, DCS. FF is a different way of doing business.

You could always do the pre-DCS analog way: local PID controller, analog DP transmitter, analog valve actuator positioner.

ABB makes a nice single loop controler CM30 There is also an option to make it a dule loop controller so it can handle two loops.

http://www.abb.ca/product/seitp330/2b8542f8825150d...

fisher ROC flowboss or controlwave can do it

thanks for the help!
i keep you informed about our solution (but it can take a while).
thanks again,
regards