Wireless vs wired monitoring sensors
Wireless sensors are easier to place and move; wired sensors are harder to lose and never run out of battery. Data integrity and coverage decide, not fashion.
- Coverage: metal racking and cold-room walls attenuate radio; a coverage survey is part of a wireless installation.
- Power: battery life claims depend on sampling interval and temperature; ULT applications shorten it sharply.
- Buffering: sensors or gateways must store data during outages and back-fill without gaps or duplicates.
- Security: wireless links should be encrypted and devices authenticated; the system's validation covers this.
- Maintenance: battery replacement is a scheduled activity with a record, and a dead battery is a data gap that must be explained.
The choice rarely affects the metrology — the sensor element is similar — but it affects the reliability of the record, which is what an inspector reads.
Frequently asked questions
- Do wireless loggers need calibration more often?
- No; calibration intervals depend on the sensor's drift, not the radio. The whole logger (sensor plus electronics) is what gets calibrated.
References
- [1]WHO Technical Supplement 16 to TRS 961 Annex 9: Environmental temperature monitoring systems for fixed storage areas
General technical guidance written against the cited sources. It is not regulatory or legal advice and does not replace the applicable standard, guideline or a qualified reviewer's judgement.
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