Integrated Shutdown Module

Station operators now have automatic notification of line leaks, not thermal problems.
No more drive-off customers from thermal problems!

Automatic Line Repressurization

The ISM-4080 and the ISM-4081 Integrated Shutdown Modules are built using the field proven technology of the ARM-4073 Automatic Repressurization Module. Auto-Repressurization technology (patent application), developed by Vmι, prevents leak detector false alarms. The ISM-4080 and ISM-4081 integrate Auto-Repressurization with real time pressure monitoring to determine when thermal contraction is occurring and compensation is required.

Submersible Shutdown at Catastrophic Line Leak Detection

When the mechanical leak detector senses a leak, the turbine authorization is removed and alarm contacts are authorized.

Automatic Line Leak Test

The ISM-4080 and ISM-4081 automatically monitors line leak tests before dispensing product and monitors Auto-Repressurization tests between dispensing cycles.

Manifolded Pumping Systems

Controls multiple submersibles manifolded into one line! Brings manifolded pipe systems into compliance using a lead-lag submersible control for any number of manifolded submersibles.

No Interference with Automatic Tank Testing

Line Leak Monitoring Reports through Automatic Site Monitoring Equipment

Sump Sensor Monitoring

External Bypass Switch

ISM-4080 - Automatic shutdown of the submersible pump if a sump sensor alarm is detected.

ISM-4081 - For use where submersible pump shutdown is not desirable (and not required) if the sump sensor is activated. Allows a choice of alarm only response or submersible shutdown if a sump sensor alarm is activated. The Leak Detector Sensor (Low Pressure) alarm will still shut down the submersible pump following detection of a catastrophic line leak.

Truck Stops, Loading Racks, Manifolded Submersible Systems, Convenience Stores
Above-ground Storage Tanks, Unattended Card Lock Systems

OVERVIEW

ISM-4080 and ISM-4081 Integrated Shutdown Module

In July of 2000, Vmι advanced the state of the art of mechanical line leak detection by introducing a way to eliminate thermal induced slow-flow, the Achilles heel of line leak detection. The introduction of the ARM-4073 Automatic Repressurization Module provided the ability to match a mechanical line leak detector and an Auto-Repressurization system to eliminate thermally induced false alarms for mechanical line leak detection without reducing leak detection sensitivity.

The ISM Modules take Auto-Repressurization technology to a new level, monitoring line pressure directly by tracking leak detector piston movement at all times. Monitoring line pressure through the mechanical line leak detector determines if the leak detector is open, establishes the appropriate time to repressurize the line, and allows the ability to determine when to disable the submersible pump for a detected line leak. The ISM line leak detection system continuously monitors the line and performs line leak checks anytime the pressure falls in the line, even when the submersible pump is off! Whether thermal contraction is occurring, a mechanical failure in the submersible pump (pressure relief or functional element), or a line leak, this system is at work. Station operators now have automatic notification of line leaks, not thermal problems. No more drive-off customers from thermal problems!

Continuous Line leak Monitoring - Automatic Line Repressurization

The ISM-4080 and ISM-4081 automatically monitor Vmι mechanical line leak detectors. After an authorization is received, the leak detector must open before dispensing begins or the submersible is shut down. Between dispensing cycles, the ISM continuously monitors the line pressure. A line test/auto repressurization sequence is initiated every time line pressure falls below 12 PSI. The test (when passed) additionally recharges the delivery system, combating thermal contraction, keeping the line pressurized and ready for fuel delivery. Long pipe runs and flexible pipe systems are automatically compensated for, while preventing false alarms.

No New Wires to the Submersible Pump Sump Containment

The ISM-4080 and ISM-4081 modules monitor the Leak Detector Sensor (piston switch). The Leak Detector Sensor Housing is screwed into the Vmι 99 Series - 99 LD-2000 or 99 LD-3000 mechanical line leak detector vent opening. An alternative vent is provided in the sensor housing. Only a single pair of wires is needed to monitor and discriminate between the Leak Detector Sensor and an (optional) single point, normally closed, intrinsically safe sump sensor. If a sump sensor has been previously installed in the sump, no new wire need be pulled for the installation of the ISM-4080. On new installations, separate wiring may be installed for both the sump sensor and the Leak Detector Sensor. With separate wiring to the sump sensor and the Leak Detector Sensor, the ISM-4081 may be programmed to actuate an alarm only or provide shutdown of the submersible during sump sensor activation.

Manifolded Submersible Control

Multiple submersibles into one line, all starting at the same time, overcome catastrophic line leak detection function. The installation of an ISM module (and piston sensor) allow multiple submersibles feeding into a single delivery line to be wired in such a manner to enable hourly catastrophic (3 GPH @ 10 PSI) testing. This is an inexpensive fix to a common problem.

Line Leak Monitoring Reports Through Automatic Site Monitoring
Equipment Auxiliary Sensor Inputs

Low Pressure Alarms and Sump Alarms (optional) are detected and displayed on the ISM Module. Alarm reports may be monitored through the ISM only, or connected in parallel to a Site Monitoring System to provide for the remote reporting of alarms. Additionally, the alarm output contacts may be used with stand-alone audible or visual devices. Wiring diagrams are provided in the ISM Installation and Operation Manual.

No Interference with Automatic Tank Testing

If tank monitoring (testing) equipment needs specific "quiet" times to perform testing, the ISM will provide uninterrupted test time, based upon time of day (programming set-up) or based on an AC or DC input signal from the site tank test equipment.

Works with Vmι "99" Series Mechanical Line Leak Detectors

To allow ISM monitoring of the 99 LD-2000 Line Leak Detector, the ISM-4101 Leak Detector Sensor/ Housing is required for retrofit and new installations. To allow ISM monitoring of the 99 LD-3000 Line Leak Detector, the ISM-4102 Leak Detector Sensor/ Housing is required for retrofit and new installations.

ISM-4080 and ISM-4081 Specifications

ISM-4080 and ISM-4081 Controller: CSA Approval Pending