This practical guide shows you how to complete a signed, QR-verified Ex-Proof / ATEX & IECEx Hazardous Area Electrical Inspection certificate in OhmCert Module #26 and how to troubleshoot non-compliant readings on site.

1. Step-by-Step OhmCert UI Workflow

  1. Open Module #26: Navigate to Ex-Proof / ATEX & IECEx Hazardous Area Electrical Inspection from the Dashboard.
  2. Load a 1-Click Standard Annex Preset: Open the blue Standard Annex banner at the top and click a preset (such as "Zone 1 Hydrogen / Refinery Area (Ex d IIC T4 Gb Motor/Junction, AIT=500C)") to populate target limits automatically.
  3. Enter Your Field Measurements: Fill in the measured inputs (Classified Hazardous Area Zone (IEC 60079-10), Installed Equipment Protection Level (EPL), Site Required Gas / Dust Group, Equipment Marked Gas / Dust Group, Equipment Temperature Class (Group II), Gas / Vapour / Dust Cloud Auto-Ignition Temp (AIT), Ex Enclosure to Equipotential Bonding Continuity, Ex e Motor Overload Relay Trip Time vs tE (at IA/IN), Ex i Barrier Max Output Voltage Uo (optional), Ex i Field Device Max Input Voltage Ui (optional), Ex i Barrier Max External Capacitance Co (optional), Ex i Total Cable + Instrument Capacitance Ci+Cc (optional)). Blank inputs stay neutral PENDING.
  4. Complete the 22-Point Checklist: Grade each item, attach photos if needed, and export the SHA-256 signed PDF certificate.

2. Worked Numerical Field Case Study

Scenario: Zone 1 Hydrogen / Refinery Area (Ex d IIC T4 Gb Motor/Junction, AIT=500C) (IEC 60079 Zone 1 IIC) — Flameproof Ex d IIC T4 Gb equipment in Zone 1 Hydrogen (IIC) environment..

  • Classified Hazardous Area Zone (IEC 60079-10): Zone 1 (Gas - Likely in normal operation)
  • Installed Equipment Protection Level (EPL): Gb (Ex d / Ex e / Ex ib / Ex px)
  • Site Required Gas / Dust Group: IIC (Hydrogen / Acetylene / Carbon Disulphide)
  • Equipment Marked Gas / Dust Group: IIC (covers IIC, IIB, IIA)
  • Equipment Temperature Class (Group II): T4 (<= 135 degC)
  • Gas / Vapour / Dust Cloud Auto-Ignition Temp (AIT): 500 degC
  • Ex Enclosure to Equipotential Bonding Continuity: 0.08 Ohm
  • Ex e Motor Overload Relay Trip Time vs tE (at IA/IN): 8 s
  • Ex i Barrier Max Output Voltage Uo (optional): 28 V
  • Ex i Field Device Max Input Voltage Ui (optional): 30 V
  • Ex i Barrier Max External Capacitance Co (optional): 83 nF
  • Ex i Total Cable + Instrument Capacitance Ci+Cc (optional): 45 nF

3. Engineering Troubleshooting: Corrective Actions When a Reading Fails

  1. Immediately de-energize and replace any apparatus whose EPL, Gas/Dust Group, or Temperature Class violates the Zone hierarchy.
  2. Replace non-compliant cable glands with certified Ex d barrier glands or Ex e glands fitted with manufacturer shroud/locking washers and thread seal.
  3. Shorten Ex i field cable runs or select low-capacitance instrumentation cable (< 80 pF/m) where C_c + C_i exceeds barrier C_o.

→ Try This Worked Example Live in Module #26 (Ex-Proof / ATEX (IEC 60079))