Safety Approach Alarm Selection — How to Compare Across Brands

The Safety-PPE Comparison Discipline

Workers' lives depend on the safety approach alarm on their wrist or arm. Brand selection cannot be a marketing or price exercise — it must compare four objective criteria, EK engineers' approach.

1. Detection Physics

• Electric-field-coupled antenna (correct).
• Capacitive contact pad (wrong — needs touch).
• RF-coupled (wrong — many false positives).
• EK A186/A187 use calibrated electric-field antenna with 50/60 Hz bandpass.

2. Threshold Accuracy

Each sensitivity step must trigger at the rated voltage ± 10 % across all temperature, humidity and orientation. Cheap brands drift ± 30 % — wearer confidence breaks. EK lot-tests every shipment at every step.

3. Wearability

1. Mass < 80 g for wrist; < 120 g for arm.
2. Strap material tolerates sweat, oil, diesel.
3. Adjustable for full PPE-suited workforce.
4. Self-test in < 5 s with one button.

4. Field-Failure Rate

Demand published failure-on-PPE-claim data over the last 3 years. EK Instruments publishes a documented zero-failure record on A186/A187 since 2023.

5. Service and Replacement

• Battery slide-cover, no tools.
• Annual recommended re-certification at supplier or accredited lab.
• EK offers regional re-cert through SEA distributor partners.

6. Compliance Standards

IEC 61243-1 and equivalent regional standards (GB, ANSI). EK A186/A187 ship with compliance certificates referencing both.

EK Recommendation

For utility, substation and rail-overhead work the A186 wrist and A187 arm-type approach alarms pass the full four-criterion audit. Request samples through EK service teams.