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Zone 0 certified trackers: exact Ex markings for GT1s, GT2s, GT2h, GT2c

Introduction

Zone 0 areas require equipment that can operate continuously in explosive gas atmospheres. For ATEX/IECEx, the canonical gas marking for Zone 0, intrinsic safety, temperature class T4 is “II 1G Ex ia IIC T4 Ga.” Below are the exact Ex strings for Geoforce’s Zone 0–certified trackers and the official spec/brochure downloads where those markings are published.

Model roster (exact Ex strings and downloads)

Model Connectivity ATEX marking (exact) IECEx marking (exact) EPL Ta (intrinsic safe) IP rating Download
GT1s Satellite (Globalstar) CE 2903 Ex II 1 G Ex ia IIC T4 Ga Ex ia IIC T4 Ga Ga −40°C ≤ Ta ≤ 65°C IP68, IP69K GT1s Spec Sheet (PDF)
GT2s Satellite (Iridium) CE II 1 G Ex ia IIC T4 Ga Ex ia IIC T4 Ga Ga −40°C ≤ Ta ≤ 65°C IP68, IP69K GT2s Spec Sheet (PDF)
GT2h Hybrid (LTE‑M + Iridium) CE II 1 G Ex ia IIC T4 Ga Ex ia IIC T4 Ga Ga −40°C ≤ Ta ≤ 65°C IP68, IP69K GT2h Spec Sheet (PDF)
GT2c Cellular (LTE‑M/NB‑IoT) CE II 1 G Ex ia IIC T4 Ga Ex ia IIC T4 Ga Ga −40°C ≤ Ta ≤ 65°C IP68, IP69K GT2c Spec Sheet (PDF)

Notes

  • The Ex strings and temperature/IP data above are taken verbatim from the linked Geoforce PDFs (each includes the ATEX/IECEx sections with exact wording).

  • EPL Ga corresponds to the highest protection level for gas atmospheres (suitable for Zone 0).

What the marking means (quick reference)

  • II 1G: Group II (non‑mining), Category 1 (Zone 0), Gas.

  • Ex ia: Intrinsic safety, level “ia” (energylimited so a single fault will not create an ignition source; suitable for Zone 0).

  • IIC: Gas group covering the most easily ignited gases (e.g., hydrogen, acetylene).

  • T4: Maximum surface temperature 135°C.

  • Ga: Equipment Protection Level for Zone 0 (continuous presence of explosive atmosphere allowed).

Verification and compliance tips

  • Always verify the device’s product label before deployment. Labels show the Ex marking and (where applicable) the EU Notified Body/CE number (e.g., GT1s carries CE 2903 in the published spec).

  • Keep the intrinsic-safe operating temperature range in mind (all four models: −40°C to +65°C in Ex conditions). Operating outside this Ta invalidates the rating.

  • For audit packages (ATEX EU Declaration/IECEx CoC, QAR), use the download links above and request the formal certificates from your Geoforce representative if your compliance program requires the certificate PDFs in addition to the spec sheets.

Choosing the right Zone 0 tracker

  • Need truly global, off‑grid coverage only: pick GT2s (Iridium satellite) or GT1s (satellite simplex).

  • Assets that move between coverage and backcountry: pick GT2h (automatic LTE‑M ↔ Iridium failover).

  • On‑grid, cost‑optimized, intrinsic‑safe deployments: pick GT2c (LTE‑M/NB‑IoT) for lower data cost.

Source documents

  • GT1s Spec Sheet (includes ATEX/IECEx strings and CE/EPL/Ta/IP): https://www.geoforce.com/wp-content/uploads/GT1s-Spec-Sheet_Geoforce.pdf

  • GT2s Spec Sheet (includes exact Ex strings): https://www.geoforce.com/wp-content/uploads/GT2s-Spec-Sheet-Geoforce.pdf

  • GT2h Spec Sheet (includes exact Ex strings): https://www.geoforce.com/wp-content/uploads/GT2h-Spec-Sheet-Geoforce-1.pdf

  • GT2c Spec Sheet (includes exact Ex strings): https://www.geoforce.com/wp-content/uploads/GT2c-Spec-Sheet-Geoforce.pdf

Safety reminder

Use only the intrinsically safe variants in hazardous areas. Installation, maintenance, and inspection must follow manufacturer instructions and applicable standards (e.g., IEC 60079‑14/‑17) to maintain the Zone 0 rating.