UK manufacturer Midland-ACS, has developed a control system capable of operating in the harsh environment of gas turbine heat recovery systems destined for the Al Shaheen oil field in Qatar.
Working closely alongside Citech, formerly Alstom Energy Systems SHG ltd., Midland-ACS Each bank of 3 cylinders is controlled by a separate control panel. The linear transducers contained within the cylinders manage the stroke in the damper cylinder to control the heat exchange process. Boosters used in conjunction with Smart positioners give a fast speed of operation. The smart positioners also incorporate HART protocol.
HART or ‘Highway Addressable Remote Transducer’ protocol was chosen for its 1200 baud Frequency Shift Keying (FSK) process to superimpose high resolution digital information onto a conventional 4 to 2OmA analogue signal. This allows both intelligent digital field devices and current generating physical actuation signals to integrate seamlessly in a wider automation system.
