The ELB continuously monitors upstream and downstream pipeline pressure dynamics to provide early detection of pipeline breaks and initiate automatic valve actuator movement to an emergency position, based on user-defined parameters. Valve actuator control - selectable as fail close, fail open or stay put - is based on rate-of-drop and rate-of-rise as well as high and low pressure limits. A remote process shut down input with the option to override all functions is also available to drive the valve to the fail position.
The ELB also provides an array of programmable alarm and alert indications and has an extensive range of features that can be configured to meet end users’ specific requirements. These include up to six remote inputs and four configurable solenoid outputs, partial stroke testing and Modbus network connectivity.
The ELB is housed in a compact, environmentally sealed and explosion proof housing that can be mounted on the actuator or remotely. Padlockable pushbuttons for local actuator operation are provided on the ELB enclosure and a vandal proof cover is available for increased security.
