Ulsan is where South Korea's refining industry began, and SK Energy's complex there is the oldest large refinery site in the country. An explosion proof mobile phone for South Korea has to cope with a plant built in phases across six decades. This page is for the HSE, instrumentation and telecoms teams who decide what is allowed into the classified areas at Ulsan. The IS-04Z1 is designed around intrinsic safety rather than a flameproof enclosure.
Launching Q4 2026 · certification and vendor documentation in progress
SK Energy's Ulsan refinery began operating in 1964 and, according to trade press, is a coking refinery of around 840,000 barrels a day. SK Innovation describes the Ulsan Complex as a shared site for SK Energy, SK Geo Centric and SK Lubricants, so a single fence carries fuels, chemicals and lubricant base oils. Crude units, residue fluid catalytic cracking, coking, desulphurisation and hydrogen-bearing treating loops are the units press reports mention. Hydrocarbon gas and vapour drive the area classification, with hydrogen sulphide and benzene adding toxicity concerns that a flammable-gas detector does not cover. Because the plant was extended in stages, classification drawings reflect different construction eras, and the practical question for a handset is whether one rating can be used across all of them.
Five points that matter on an old, large and continuously operating complex.
Parts of Ulsan were built in the 1960s and parts far more recently. A handset with a Zone 1 design target, II 2 G Ex ib IIC T4, is intended to be usable across all of them, subject to the final certificate scope and the site's own drawings.
Surfaces on residue and coking units run hot. The T4 target, a maximum surface temperature of 135 degrees Celsius, is a figure the instrument engineer compares with the temperature class permitted for each area.
Ulsan sees humid summers and cold winters. IP68 sealing and rugged build are specified for the whole range, and the 4,000 mAh battery for a long outdoor round.
Sixty years of operation means a long inspection history. The 50 MP camera with a GNSS position makes a digital record of a defect easy to attach to an existing work order.
A site this size already has a device estate to manage. EMM and MDM enrolment through Android Enterprise lets the operator treat the IS-04Z1 as another managed Android device with its own camera policy.
Ulsan runs continuously, and individual units come down for planned maintenance in turn rather than the whole site at once. Trade press has reported turnarounds of individual crude and cracker units lasting around forty days, with extra contractor staff working around the unit. Operators work shift rotas with fixed rounds, and the permit office controls anything that changes the hazard. A handset therefore needs two behaviours: unattended reliability through a long round, and fast enrolment and retirement during a shutdown that brings people in on short contracts.
An outside operator walks a unit, photographs a seeping flange and sends the photograph and position to the board operator without leaving the area.
A contractor supervisor receives enrolled devices with the permit app, then returns them for wipe and reissue as the crews rotate through.
An inspector records a reading, a photo and a position against an equipment tag, ready for the report the same day.
SK Energy's equipment-approval process is internal and we do not describe it beyond what is generally true. ask the operator's procurement and HSE teams for its requirements in writing before any evaluation. The usual items for a Korean refinery are below.
No. The device is pre-launch and certification is in progress ahead of the Q4 2026 launch. No evaluation, listing or order exists at SK Energy.
Group relationships may be relevant context, but the Ulsan site has its own engineering and HSE review and its own approved-equipment arrangements.
That is the design intent for a Zone 1 gas device, but the answer for any particular area comes from its classification drawing and the final certificate scope. Send us the drawing and we will say plainly.
No. Both operate in the Ulsan area but they are separate companies with different owners and separate approval processes.
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 South Korea. 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.
Tell us the zone, gas group and operator. We will send the datasheet and the certification schedule for your market.
