LDP1WC-47 LOW PRESSURE MONITOR

ECHOLINE®
was designed in cooperation with a leading semiconductor manufacturer to prevent costly system shutdowns and reduce maintenance costs associated with low pressure monitoring of gas cabinet exhaust systems.
ECHOLINE’s Maintenance Mode feature prevents false alarms during system maintenance and balancing.
A customer defined time delay prevents false trips which can cause system shutdowns. “ECHO” (Electronic Circuit Health Output) diagnostics alert the user to loss of external power or internal electronics failure.
Four ECHOLINE® units fit into the space of one oldfashioned gauge/switch.

Operation
High and low limit alarms are independently set from the front panel. In normal operation, the LED display will indicate the sensed pressure and the High Limit/Low Limit LED status indicators will be green. When a preset limit is exceeded, the LED signals an alarm condition by turning red. After a customer selected time delay, the electromechanical relay contacts will be latched open and the LED display will flash the process pressure once every second. Manually depressing the reset button will cause the relay contacts to close if and when the process pressure is within set limits.
Maintenance Mode
The “Maintenance Mode” option is a unique and convenient safety feature which allows the user to widen the alarm set points during system maintenance. By closing terminal circuits 3 and 4, using a key switch or password protected computer, the user can expand the limits to 5% and 95% of the range to continue monitoring and prevent false trips. Opening terminal circuits 3 and 4 immediately returns the set points to the previous settings.
Time Delay ECHOLINE®
includes an adjustable “stand alone” time delay to prevent intermittent tripping due to brief transient upsets. When the unit senses a pressure outside the limits, the status LED will immediately turn red, but the relay will not open for a pre-selected time delay. The time delay will reset to zero if the process pressure returns to within the limits during the transient conditions. This feature provides a degree of “fault tolerance” for exhaust flow interlock applications. The time delay is field settable through a jumper located on the rear of the enclosure for 1, 10, 20 or 30 seconds.

LDP1WC-47