Wireless condition monitoring for critical assets can play an important role in plant management. In Section (1), this paper explores the practical issues surrounding the use of wireless sensors by reviewing the types of wireless sensors and standards available, and by considering range, power, bandwidth, capacity and security. 900MHz wireless is shown to have strong advantages in certain areas, particularly range. In Section (2), a field test is described where multiple sensors are deployed throughout a large industrial facility and used to monitor assets. The results of this test demonstrate the practical aspects of installing and maintaining a wireless monitoring network, and the advantages of operating the system.