7
Line Interface Module (LIM)
The LIM device is a magnetic contactor that supplies line/tank activity
by monitoring input/output status of nozzle signals and Submersible
Turbine Pump (STP) contactors.
Each Line Interface Module (LIM) interface (maximum of four (4) per
system) will monitor up to four (4) pressurized lines (for a total of 16
sensors per system). In the case of manifold submersible pumps, only
one (1) LLD sensor is installed, but the manifold will require one LIM
position for each submersible pump.
Typically, the dispenser sends a “hook signal” (110 V) to the
submersible pump controller, whereas the LIM functions by
intercepting this hook signal and communicates via Petro-Net™ with
the SiteSentinel® iSite™ requesting the status of the LLD sensor
installed in the submersible pump’s leak detection port. The LIM sends
signal to the STP controller to turn the submersible pump ON, unless
an alarm condition is detected then no signal is sent. A HV feedback
signal confirms that the submersible pump is turned ON.
The LIM works in conjunction with the SiteSentinel® iSite™ to test the
lines during periods of inactivity to consistency monitor the site for
leaks in the line(s).
Figure 7-1 LIM Functional Overview
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