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An industrial wireless sensor loses data intermittently when the radio path or the data path degrades faster than the system's margin can absorb: moving or new metal equipment blocking the path, multipath cancellation, a gateway placed inside a metal cabinet or at the edge of coverage, interference from other radio equipment, weakening batteries or unstable power, or congestion and timeouts in the network between gateway and platform. The first safe check is pattern analysis — timestamps of the missing data against site events (shift patterns, vehicle movements, machine startups). Radio work at height or near energized equipment belongs to qualified personnel.
Intermittent loss means marginal margin, not hard failure. The link works most of the time and collapses under specific conditions — the goal is to name the condition.
Timestamps are evidence. When data gaps correlate with forklift routes, shift changes, door positions or machine states, the cause is physical obstruction or interference, not the sensor.
Gateway placement decides most of the coverage. A gateway in a metal enclosure, behind equipment, or equidistant-from-everything-but-close-to-nothing cannot be fixed at the sensor end.
Power problems masquerade as radio problems. A battery whose voltage sags in cold weather or under transmission load resets or skips reports — check power trends before repositioning antennas.
Collect before changing. Link-quality readings, RSSI where the system reports it, packet-loss statistics and gateway logs turn guesswork into a diagnosis.
This article covers intermittent gaps in the data stream of wireless sensor nodes:
Periodic gaps — regular missing reports from one node;
Correlated gaps — losses at specific times or site events (vehicle movement, machine startups, shift patterns);
Multi-node gaps — several nodes lose data together;
Recovery-after-reboot gaps — loss ends when gateway or node restarts.
