1. overview Usually method of temperature measuring can not be applied to high voltage electrical equipment temperature monitoring point because of strong electromagnetic noise, high-voltage insulation and space limitation. Developed and designed independently by our company, MRD-CW900 wireless temperature monitoring system uses radio waves for signal transmission without electric connect with receiving equipment. This system has low price but high reliability and safety, which be used to record real-time operating temperature of high voltage equipment so that provide cumulative data for high voltage equipment maintenance 2. Performance requirements Manageable sensor numbers: 32 or 64 Internet interface: one-line isolation RS-485 industrial bus interface Operating power: AC220V/DC220V (special requirements are acceptable) Operating temperature: -10℃～+85℃ Storage temperature: -40℃～+85℃ Installation method: Standard 35mm din-rail installation Installation position: inside meter cabinet Size: 70*48*113