The SRD-99, manufactured by Simex, is a stationary data recorder designed to record and display current values as well as to present technological parameters in the form of graphs. It has 2 electronic relays with max. load 24V AC (35V DC) 200 mA. Main function of outputs is a signalisation of critical situations, but thanks to expanded menu it is possible to use it in numerous control and regulation applications. Both outputs can be driven by single measurement channel or by group of channels (from 1 to 8 channels) with individually adjustable thresholds for every measurement channel. When a USB flash drive is plugged permanently, it can significantly extend the recording time without a need of data transfering from SRD-99 to a PC.