Temperature sensors are used to monitor the heat of hydration in mass concrete structures. They can also be used to monitor migration of ground water or seepage. The VW temperature sensor consists of a stainless steel body, a wire held in tension within the body, an electromagnetic coil, and signal cable. The body of the sensor expands and contracts with changes in temperature, increasing or decreasing the tension of the wire inside the body. When a readout is connected to the sensor, it sends an electric pulse to coil, which plucks the wire and causes it to vibrate at its natural frequency. A second coil picks up the vibration and returns a frequency to the readout. The frequency reading is converted to units of temperature by applying calibration factors

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