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PLC 5000


The PLC-5000 Full Shutdown System monitors and detects leaks in closed piping systems. Specifically, it is designed to meet Environmental Protection Agency (EPA) guidelines for gasoline station monitoring. In addition to continuously monitoring for leaks at the 3 gallons per hour rate, the system is capable of performing line leak testing at 0.1 and 0.2 gallons per hour rates.

Description: 

The PLC-5000 Full Shutdown System is configured as a distributed control network composed of elements referred to as nodes. Each electronic node is capable of performing a specific task. The central control node functions as the master node in the network. The communication media in this network is the power main. All communication between central and remote nodes is carried on the same wires that provide power to the nodes of the network.

The basic function of the Central Control Node (CCN) is to monitor for product dispensing requests, monitor the activity of each of the remote Leak Detector Nodes, and determine the operation of the submersible pumps or turbines. Also, in the event of a detected leak or other error condition, the CCN will issue appropriate alarms.

The basic function of the Leak Detector Node (LDN) is to monitor pressure in the distribution line and communicate the status of the line to the CCN. The LDN also directly controls its associated pump or turbine under instruction from the CCN. In addition, the LDN is capable of monitoring an optional sump sensor for the presence of liquids. This sensor may be of the type which discriminates between water and hydrocarbons (fuels).

Mechanical leak detectors are also included in the monitoring system. A leak detector is connected to an LDN so that both line pressure and the status of the leak detector can be monitored. Also, there are additional benefits provided by the leak detector.

Benefits: 

  • No wiring to pull between sump and central controller

  • Simultaneous control of up to four turbines

  • Automatic 3 gph testing

  • Manually activates 0.2 and 0.1 gph precision testingv

  • Full shutdown control

  • Reported leak rates


Features: 
The following statements outline the basic operation of the shutdown control system:

  • With power applied, the system is active and monitors for dispensing requests and alarm conditions. The CCN can be programmed to operate in a variety of system configurations which may include control valves, staged turbine control, manifolded supply tanks, and variable speed turbines.

  • Upon receiving an authorization signal for fuel dispensing, the CCN will issue a command to the appropriate LDN to energize its turbine.

  • Using the mechanical leak detector, the system will perform a 3 gph leak test. If the LDN determines that proper line pressure has been achieved, it will communicate this status to the CCN. The CCN will then allow the dispensing of fuel.

  • If proper line pressure is not achieved, a 3 gph leak failure exists. Under this condition the CCN will signal the LDN to deenergize its turbine contactor and an appropriate alarm will be issued. This action represents one of the full shutdown modes of the system.

  • The CCN will also conduct a 3 gph leak test following completion of any dispensing operation.

  • When requested, the CCN node will also conduct precision leak testing at levels of 0.1 gph and 0.2 gph.
Downloads:

Contact Information:

For sales and service, please contact Vaporless Manufacturing, Inc. at 800-367-0185.

For other information please call Barrett Engineering at 707-725-9898.