Series Transformer Intelligent Monitor The QUALITROL 509 series oil filled transformer intelligent monitoring instrument (509ITM) provides microprocessor technology and advanced digital signal processing functions, which can accurately evaluate the health and performance of oil filled transformers. 509ITM can be customized for specific applications. This complete transformer monitoring system can monitor up to 8 total parameters, such as: ● Liquid temperature (top or bottom temperature of main oil tank, temperature of on load tap changer) ·Winding temperature ·Environmental temperature ·Winding current ·Cooling group current ·Various parameters from sensors, such as oil tank pressure or dissolved gas during oil analysis The inputs required for 509ITM include: ·Resistance temperature detector (RTD) Current transformer (0-5 A, O-10 A, 0-20 A, 0-50 A, 0-100 A) · AC voltage (0-140 VAC or 0-320 VAC) ·Potentiometer (5K-15K) ·Current circuit (0-1 or 4-20 mA DC) ·DC voltage (0-100 mV or 0-10 V) ·Tap position resistor bridge ·Switch engagement type (energized or dry engagement)