Abstract: A portable testing apparatus for testing the electrical systems and pneumatic systems of vehicles and trailers is provided. The apparatus can be alternatively connected to a vehicle or to a trailer. When connected thereto, a power supply in the testing apparatus provides electrical power to energize and test the various electrical systems thereof and a compressed air supply, also located in the testing apparatus, provides compressed air to feed and test the various pneumatic systems thereof. The testing apparatus is also generally equipped with indicator lights to provide visual indication of the proper functioning of a particular electrical circuit. Similarly, the testing apparatus is also generally equipped with pressure gauges to indicate the amount of pressure in a given pneumatic system and to detect leaks if any. The testing apparatus may also comprise a ground testing circuit for verifying that the vehicle or the trailer is correctly grounded electrically.

Abstract: A system for monitoring and controlling distributed functions within a building, such as the pressure and temperature of gases stored within cylinders. A plurality of modules are located at strategic points within the building for performing specific allocated functions in relation to monitoring and controlling the status of the gas cylinders. A first type of module detects dangerous conditions within the gas cylinders and generates and displays alarm signals in response thereto. A second type of module displays the alarm signals at a location remote from the gas cylinders and transmits command signals for remote shut off of a predetermined one or more of the gas cylinders. A central module interconnects each of the first and second modules and controls signal transmission therebetween.