Abstract: The operation has a plurality of points, each associated with a slave device, the devices being part of a SCADA network that includes a computer. The apparatus comprises: modules each including a sensor having a thermal imager and a transceiver coupled to the sensor to receive data and adapted for cellular communication; and functionality adapted to receive information via cellular network and to communicate with the SCADA. The functionality is couplable to the SCADA as a device and configured such that data delivered from the sensor to the transceiver is delivered as if from multiple points. The system comprises: a repository; a computer adaptation configured to permit conditions to be set which trigger alerts including a DNP point and a time stamp; and a further adaptation which, responsive to an alert, fetches from the repository an image file associated with the point and the stamp, and displays the image.