What are the standards and considerations for wireless instrumentation?

Wireless instrumentation standards include: WirelessHART (IEEE 802.15.4, mesh network, battery powered, 10+ year battery life), ISA100.11a (similar to WirelessHART, more flexibility), and WiFi/Ethernet for high-bandwidth needs. Considerations: reliability (mesh provides redundancy, time-synchronized for determinism), security (encryption, authentication, intrusion detection), coexistence (frequency management with other wireless systems), battery life vs update rate, range and infrastructure (gateways, repeaters), latency (typically seconds, not for fast loops), and hazardous area ratings. Applications include: monitoring difficult-to-wire locations, temporary measurements, and retrofit without cabling costs.