Tr-7 Safe-t-ground

Model TR-7 Safe-T-Ground provides continuous monitoring of a truck a s ground connection throughout loading operations. Static electricity is often brought in by tank trucks entering the loading area.The Safe-T-Ground Model TR-7 instantly stops loading operations if a tank truck loses its ground.The simple but rugged Model TR-7 circuit continuously measures resistance through the truck by applying a small voltage to one terminal of the truck grounding contactor.The other terminal is connected to the loading rack ground.If the Safe-T-Ground detects a resistance of more than a few ohms across the contactor terminals,the relay opens,breaking the control circuit.The relay will not close until the grounding contactor is properly connected. To safeguard loading operations,the Safe-T-Ground circuit can be wired into your pump control a and to an audible alarm or signal light..
The double wire TR-7 system provides an extra safeguard against explosion,compared to single wire grounding,which cannot measure the quality of the electrical ground connection during loading.The transistorized TR-7 circuit generates little heat a an added safety feature.. The Model TR-7 Safe-T-Ground is simple and easy to install.Removal of the cover on the explosion-proof aluminum housing reveals the easily accessible terminal strip for relay and ground control wiring,and a complete schematic wiring diagram appears on a label next to the terminal strip for easy wiring.