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Preventive maintenance for industrial alarms: annual checklist

4/1/2026 · 5 min read

A technical alarm that isn't maintained becomes, over time, another silent failure point. Probes drift, batteries age, panel contacts loosen, and the IoT SIM expires or switches carrier. This annual checklist keeps the system operational and certifiable.

Probes and sensors

  1. Calibration check of each probe against a NIST-traceable reference. Record drift. If beyond ±0.5 °C on temperature probes: replace.
  2. Visual inspection: corrosion, dirt, condensation inside the housing. Clean or replace.
  3. Wiring: connection check, twisted pairs intact, shielding in place.

Electrical panel connection

  1. Tightness of auxiliary contact terminals — the classic "fired by itself" usually traces back to a loose terminal.
  2. Functional test: trigger a controlled differential trip and verify the alarm catches and alerts.
  3. Voltage-free contact isolation: continuity and parasitic-current absence.

Connectivity and autonomy

  1. IoT SIM test: coverage of configured operators (verify failover by disabling the main one).
  2. Wi-Fi backup: confirm the fallback network is still reachable (did the password change? was the router replaced?).
  3. Internal lithium battery: measure voltage and simulated autonomy. Replace every 3-5 years per vendor.

Alerting system

  1. Call test: force a test alarm and verify the call chain escalates properly. Block 30 min on a Saturday.
  2. Contact list: are the phone numbers still active? Are the people still on staff? Update.
  3. Roles and permissions: anyone with admin rights who shouldn't? Revoke.

Audit documentation

  1. Exported history for the last year as CSV. Archive locally and to cloud.
  2. Maintenance report signed by the technician, with the outcome of the 12 points above.

When to do it

Ideally aligned with the annual external audit (IFS, BRC, integrator) — the maintenance tech and the auditor can share work. A good date is 4-6 weeks before the audit: enough time to react if anything turns up.

If your technical alarm vendor doesn't offer this yearly service, it's a red flag. Aviot includes it in premium contracts with a signed audit-ready report.

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