| Using
Current Sensing to Detect a Failed Lamp This application illustrates how current sensing can cost effectively sense the failure of a critical lamp load in a piece of process equipment. A lithograph dryer is used in the production of expensive reproduction prints. The inks used for this medium are cured by ultraviolet lamps. The inks are laid down in stages to achieve the four color reproduction process. The inks are cured by the ultraviolet lamps between stages. A lamp failure or a decrease in lamp intensity can ruin this process. The undercurrent monitor is utilized to detect when the operating current falls below a predetermined level for the number of lamps in use. Any change in current below the preset level is viewed as a fault and the output contacts are used to shut down the process for repair. |
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| Sensing
Failed HID Lighting Current sensing can also be used to detect the failure of safety lighting and automatically energize backup lighting. HID lighting was used to provide customer safety in a local banking establishment. If an HID lamp fails to light, the current sensor automatically switches on backup incandescent flood lights. After a momentary power outage, the incandescent lights are on while the HID lamps warm up. For equipment that uses electromechanical logic or requires a trip delay, the ECS Series is used. For PLC controlled equipment, the TCS Series would be selected. |
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