1 · Where is it? (area classification)

2 · What is in the air? (the gas)

FLAMMABLE SUBSTANCE

3 · What are you installing?

TEMPERATURE CLASS OFFERED BY THE VENDOR

Required marking for this duty

Realistic presets

Protection concepts — what survives here

Concept	Verdict	Why

The ignition triangle above shows which leg the — concept removes.

Ex i only — how long may the cable be?

Intrinsic safety is a property of the whole loop. Cable capacitance and inductance are stored energy, so the certificate limits the metres. Barrier output must satisfy Uo ≤ Ui, Io ≤ Ii, Po ≤ Pi, and Co ≥ Ci + C_cable, Lo ≥ Li + L_cable.

BARRIER Co (allowed external capacitance) DEVICE Ci (its own capacitance) CABLE CAPACITANCE BARRIER Lo (allowed external inductance) DEVICE Li (its own inductance) CABLE INDUCTANCE

Decode a marking you were handed

NAMEPLATE STRING (edit it)