Hydrogen-rich gas
The design target of II 2 G Ex ib IIC T4 is aimed at the demanding gas groups, hydrogen included. The exact marking and scope will be stated on the certificate, and the works' own classification drawings decide where it applies.
Czech Republic · Třinecké železárny
Explosion proof mobile phone for Třinecké železárny, coke ovens
An explosion proof mobile phone for Třinecké železárny has to work in an integrated steelworks where the gas hazard is not natural gas but coke oven gas and blast furnace gas. Třinecké železárny, founded in 1839 and based in Třinec in the Moravian-Silesian region of the Czech Republic, runs a closed cycle from coke production to hot-rolled steel. This page is for the HSE, energy and maintenance teams deciding what a person may carry through the coke plant and the gas network. The IS-04Z1 is designed around intrinsic safety rather than a flameproof enclosure.
Launching Q4 2026 · ATEX certification in progress
Local approvalATEXEU Directive 2014/34/EU · nařízení vlády 116/2016 Sb. · in progress
AvailabilityQ4 2026via authorised distributors
The works · Třinec
Explosion proof mobile phone for the Třinec coke plant and gas network
The company's published description is of an integrated works with a closed production cycle: a coke plant of two coke batteries, one of which was rebuilt and put back into service around 2011, sinter plants, blast furnaces fed with coke and pulverised coal injection, steelmaking in both converter and electric arc furnaces, ladle treatment, continuous casting and rolling mills. Annual steel output is around 2.5 million tonnes, mostly long products such as wire rod, sections, rails and seamless tube. The sole shareholder is Moravia Steel a.s. That cycle generates three gases that matter to a handset. Coke oven gas is hydrogen-rich, so a gas group IIC rating is the relevant one. Blast furnace gas is mostly carbon monoxide and nitrogen, and it is toxic and an asphyxiation risk more than a flammability puzzle. The by-product plant that recovers tar, benzol and ammonia from coke oven gas handles benzene, a gas group IIA vapour. On the solids side, coal, coke and ore handling and coal injection give combustible dust areas, which is where Zone 21 and 22 come in.
Parts of the works
- Coke plant
- Two coke batteries, coal handling and the by-product plant recovering tar and benzol.
- Sinter and blast furnaces
- Ore preparation and hot metal production, with blast furnace gas cleaning.
- Steelmaking
- Converter and electric arc furnace shops, ladle furnaces and casters.
- Rolling mills
- Billet, bar, section and wire rod mills.
- Gas holders and distribution
- Coke oven and blast furnace gas mains, boilers and power plants.
Where classification applies
- Coke oven gas mains
- Hydrogen-rich flammable gas; Zone 1 and 2 around joints, valves and flare.
- By-product plant
- Benzol and tar handling; flammable vapour and toxic exposure.
- Coal and coke handling
- Conveyors, bunkers and silos with combustible dust.
- Pulverised coal injection
- Dust system feeding the blast furnaces.
- Offices, control rooms and rolling mills
- Mostly outside the classified boundary.
Built for a hot, heavy site
What a steelworks asks of a handset
A works of this kind is noisy, hot and full of heavy vehicles, with gas hazards at specific points rather than everywhere. The points below are the ones that matter most.
IP ratingIP68
Battery4,000 mAh
Camera50 MP
OSAndroid 16
Gas and dust in one programme
Zone 21 dust protection sits in the same certification programme, so a device that has just left a coke oven gas area can carry on into coal handling.
Toxic gas stays with the site
Blast furnace gas and coke oven gas are toxic as well as flammable. Personal gas detectors and rescue procedures remain the protection against that, and the handset works alongside them.
A shift on foot
The works covers a large area and there is no charging point in classified zones. The 4,000 mAh battery is specified to carry a shift.
Vibration, dust and wash-down
IP68 sealing and rugged build are aimed at dust, vibration and rain. They are not a rating for hot metal splash, which is handled by the operator's PPE rules.
Use cases · Třinec
Where the IS-04Z1 goes to work.
Energy01
Gas network rounds
Gas network crews check mains, valves and holders and record a leak with a photograph and a position, rather than a description.
Maintenance02
Blast furnace and coke battery outages
Planned outages bring contractors for refractory, mechanical and instrument work. Enrolment, restriction and wipe are managed from the existing console.
Logistics03
Raw material handling
Operators on coal and coke conveyors report faults from the spot, in a dust area, without walking to a safe zone.
Procurement and access
What suppliers should expect to be asked
No published Třinec supplier registration scheme has been verified for this page, so none is described. Ask the company directly.
- Procurement and HSE
- They will say which areas, and which gas groups, are in scope for a handset.
- Certificate
- ATEX certificate, Czech instructions and declaration of conformity; not yet issued for the IS-04Z1.
- Gas composition
- Coke oven gas composition is specific to the works. Ask for the classification basis, not just the zone.
- Contractors
- Outage contractors typically need to show the same equipment evidence.
Questions · Třinecké železárny
Frequently asked questions
Is the IS-04Z1 certified for use at Třinec yet?
No. It is pre-launch and ATEX certification is in progress ahead of the Q4 2026 launch.
Why does coke oven gas need an IIC device?
Coke oven gas is rich in hydrogen, which is gas group IIC, so a handset used around the mains has to be rated for the most demanding group.
Is blast furnace gas an ignition problem?
It is flammable but mostly a toxicity and asphyxiation risk because of its carbon monoxide. The handset does not protect against that; gas detectors do.
Does the device cover dust areas such as coal handling?
Zone 21 dust is part of the design target, and the certificate will state the exact scope. The works decides which dust areas are classified.
Enquiry · Třinecké železárny
Ask about the IS-04Z1 for Třinecké železárny, Czech Republic
Tell us the site, the zone and gas group, and roughly how many handsets. The SAMS team replies by email with the datasheet and the certification schedule for Czech Republic. The IS-04Z1 is pre-launch and certification is in progress, so there is no list price yet; indicative pricing is issued in writing against a stated quantity and site.
Enquiry · Třinecké železárny
Launching Q4 2026
Evaluating the IS-04Z1 for this site?
Tell us the zone, gas group and operator. We will send the datasheet and the certification schedule for your market.