GSM Based Data Logger is available with built in GSM modem which enables continuous centralized monitoring of TR parameters and at the same time notification for any alarm occurrence at central station as well on the configured cell numbers. The Data Logger is a microcontroller based remote monitoring unit. The Data Logger enables easy and wireless centralized monitoring of all TR parameters like TR voltage, TR current, and reference potential and optionally AC interference voltage. The Data Logger is offered in a compact design and consumes low amount of power during operation. GSM Based Data Logger can be installed in the existing TR unit and can directly accept TR parameters without the need of any transducers.