The instruments wirelessly transmit measurements up to 2,000 ft. to a base radio connected to a control system or data acquisition device. Each base radio accepts the signals of up to 50 transmitters. The base radio provides Modbus or 4-20 mA analog signal output for flexible communications.
Eastman has begun field trials of wireless sensors, and so far they have worked well. They reduce the installation cost and time compared to traditional wired sensors.
Wireless technology is all around us, and offers many benefits. The prices for most wireless technologies have dropped so much that it pays to keep an eye on the technology, if not for work, then at least for home use. But if you go wireless, spend a few extra minutes turning on the basic security features to ensure your system is safe and secure.
Dave Hrivnak is mobile projects manager for Eastman Chemical Co., Kingsport, Tenn. Visit him at www.hrivnak.com.