The industry has spent a decade selling permanent sensors as the obvious upgrade. Sometimes they are. Often they are an expensive way to collect data nobody has time to interpret. Here's how to decide without the sales pressure.
What handheld route-based collection does well
A skilled analyst walking a route brings something no sensor does: judgement. They hear the machine, feel the housing temperature, spot the oil leak, notice the new guard rattling and adjust the measurement when something looks wrong.
It is also dramatically cheaper per asset, requires no installation or cabling, and covers dozens of machines for the cost of instrumenting a handful.
Where permanent and wireless sensors win
Continuous monitoring earns its place in specific, identifiable cases:
- Genuinely unmanned or inaccessible assets — roof-mounted fans, confined spaces, hot zones.
- Machines that fail fast, where a month between readings is too long.
- Highly variable duty, where a monthly snapshot may not catch representative conditions.
- Single points of failure with catastrophic commercial consequences.
The cost nobody quotes
Sensors generate data continuously; data only creates value when someone interprets it. Without analyst time attached, alarm thresholds get widened until the system stops complaining, and the investment silently stops working.
Whichever technology you choose, budget for interpretation, not just hardware.
The sensible hybrid
Most SME plants land in the same place: handheld routes as the backbone across all critical assets, plus permanent sensors on the two or three machines that genuinely justify them, with all the data feeding one monthly report. Add sensors when a machine earns them — not because a package demanded it up front.