LDP1WC-62  LOW PRESSURE MONITOR 

Description

Overview

Essential details：LDP1WC-62  LOW PRESSURE MONITOR 

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.
ECHO Diagnostics
The ECHO function is an internal electronic check of certain circuit parameters. In the event of an internal failure, the ECHO output relay immediately opens to communicate the fault condition and the unit display goes blank. The electromechanical output relay has isolated contacts that monitor the circuit in real time.

LDP1WC-47

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LDP1WC-62  LOW PRESSURE MONITOR