Distributed control systems
The Type 990 is a signal processing unit that takes a signal from an input device such as a level sensor, normally situated in a vessel. It provides an analogue and digital retransmission output, which is generally used for indication, control or alarm applications.
The unit accepts signals from a wide range of remote instruments, including the Hawker Flexicap,
Sondaloop and other pressure transducers and transmitters. Once it has been calibrated, the input signal is displayed on the internal LCD as a percentage in the range of 0 to 100.0.
The user may calibrate the LCD full scale percentage over any part of the vessel. The retransmission output provides an analogue current and voltage proportional to the user calibrated input.
Otherspecial functions can be programmed by the user, such as a reverse acting display or reverse acting transmission output, which are accessed through The Type 990 menus.
For use with all standard liquid level sensors