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Monitor Circuit for Solvent Stations

IP.com Disclosure Number: IPCOM000084622D
Original Publication Date: 1975-Dec-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 75K

Publishing Venue

IBM

Related People

Palagonia, AM: AUTHOR [+3]

Abstract

This system provides a safe working environment when working with hazardous chemicals and/or electrical circuits. It complies with stringent Occupational Safety and Health Act (OSHA) requirements.

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Monitor Circuit for Solvent Stations

This system provides a safe working environment when working with hazardous chemicals and/or electrical circuits. It complies with stringent Occupational Safety and Health Act (OSHA) requirements.

In the event of the failure of a gas to purge a system, an exhaust system failure or a solvent leak near the solvent stations, the circuit shown in the figure:
1. Depowers the entire unit; and 2. Automatically drains all solvent tanks to the central solvent drain system.

The system operates by the breaking of latching circuits Ek2,Ek3, or Ek13 which open fail-safe contractor Ek1 on the primary power supply to all control circuits. The reset circuits remain powered. Draining is accomplished by the removal of power to the normally opened solenoid valves below each tank.

For example, if a solvent leak at a station is detected by gas sensors A or B, the sensor activates the combustible gas detector which causes relay Ek13 to break. This in turn causes a discontinuity in the series connection of relays Ek2,Ek3,Ek13 and Ek1. Relay Ek1 disconnects line power plus the neutral line from the equipment. The combustible gas detector is preferably a Model 520 marketed by General Monitors, Inc.

The circuit also contains indicator lamps such as "purge fail", "exhaust fail", etc., which indicate the cause of the shutdown and allows for reset if and only if the cause of the shutdown has been removed or repaired.

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