Application Note

Wireless pH Monitoring Of Storm Water Runoff And Final Effluent

Source: Emerson

Wireless pH instrumentation is appropriate in several applications in the power industry. The principal benefit of a migration to wireless technology from more traditional copper cable is cost reduction. A wireless network requires none of the cable, conduit, or switching hardware which represent the largest expense in most plant networks. This enables plant operators to measure process parameters in areas which would be prohibitively expensive to wire, such as runoff collection ponds and final effluent streams.

Rosemount's wireless transmitters are based on the HART 7.0 (WirelessHARTTM1) standard which incorporates a number of features to make the network robust and secure. Each device in the network can serve as a router for the traffic of other devices within radio range. This means that each transmitter need not have direct radio line-of-sight to the gateway, but need only connect to at least one other device in the network. Since each transmitter is typically in communication with several of its peers, it will have redundant transmission pathways should one of them become blocked. All data transmissions are protected by encryption and key rotation is automatically handled by the gateway. Devices must be authenticated by a network control system before they are permitted to operate. Because WirelessHART is an open standard, Rosemount's transmitters seamlessly integrate with the Emerson, Rosemount Smart Wireless family of devices as well as those of third parties who adhere to the WirelessHART standard.