Climate
A humid subtropical climate with heavy June to August rain.
Yeosu · IECEx
IECEx Smartphone in Yeosu
Yeosu consists of a peninsula and 365 islands, 48 of them inhabited, midway along South Korea's southern coast beside the Bay of Suncheon, with a population of about 269,000. GS Caltex's Yeosu Complex and Lotte Chemical's Yeosu plant create large Zone 1 and Zone 2 areas. This page explains what to look for in an IECEx smartphone for Yeosu, and where the IS-04Z1 stands against that list today.
Pre-launch · certification in progress · Launching Q4 2026
Marking targetEx ib IIC T4Intrinsic safety, Zone 1 / 21 design target · certification in progress
AvailabilityQ4 2026via authorised distributors
Search topicIECEx
DeviceSmartphone
RouteSpecification
WhereYeosu
Short answer. The SAMS IS-04Z1 is the intrinsically safe smartphone covered here for Yeosu: pre-launch, designed for Zone 1 and Zone 21 (marking target Ex ib IIC T4), with certification in progress and no certificate issued.
Status: pre-launch. IECEx, ATEX, UKEX and NEC 500 certification is in progress and no certificate has been issued; launch is planned for Q4 2026. Operator approval runs on its own timeline. Certification status. Place facts reviewed October 2026.
At a glance · IECEx
Checklist: IECEx smartphone for Yeosu
| Check | What to look for | IS-04Z1 today |
|---|---|---|
| Certificate of conformity | Number checkable on the IECEx online register | In progress; not issued |
| Standards edition | The IEC 60079 edition the certificate cites | Stated on the certificate when issued |
| Schedule of conditions | Limits of use, batteries and accessories | Published with the certificate |
| Where it applies | Yeosu: Refinery process units, Ethylene cracker and polymer plants, Chemical storage tank farms | Classified by the site operator |
Product · Yeosu
The product behind this search: the SAMS IS-04Z1.
SAMS IS-04Z1
An intrinsically safe Android smartphone designed for Zone 1 and Zone 21 hazardous areas in Yeosu. It is pre-launch: IECEx, ATEX and NEC 500 certification is in progress ahead of the Q4 2026 launch.
- IP68 sealed
- 4,000 mAh battery
- 50 MP camera
- Android 16
- Zone 1 / Zone 21 design target
The site · Yeosu
Working in Yeosu: operators and classified areas
The companies on site and the hazardous-area types a handset is likely to meet there.
Operators and companies on site
- GS Caltex
- Lotte Chemical
Classified areas to expect
- Refinery process units
- Ethylene cracker and polymer plants
- Chemical storage tank farms
- Marine loading jetties
Local conditions · Yeosu
Site conditions at Yeosu: what wears and what limits equipment
GS Caltex
The Yeosu Complex covers about 6 million square metres, with a mixed feed cracker completed in November 2022 producing 900,000 tonnes of ethylene a year.
Field notes · Yeosu
More about Yeosu that matters for portable equipment
Yeosu: climate and equipment wear
Yeosu has a humid subtropical climate with very warm summers and cold winters, and from June to August more than 200 mm of rain falls each month.
Yeosu: who works there
GS Caltex is owned in equal shares by Chevron and GS Energy and was founded in 1967 as Korea's first private oil company, so it follows long-established corporate safety systems.
Yeosu: projects and investment
In November 2022 the company completed a 2.7 trillion won mixed feed cracker near the Yeosu No. 2 Complex, with annual capacity of 900,000 tonnes of ethylene and 500,000 tonnes of polyethylene.
Yeosu: logistics and access
The company imports around 80 types of crude from about 30 countries and exported to 57 countries in 2022, so tanker and product shipping through the Yeosu coast is continuous.
The term · IECEx
What “IECEx” means for a smartphone
IECEx is the international scheme for certifying equipment used in explosive atmospheres. A certificate of conformity is issued by an accredited certification body against a specific edition of the IEC 60079 standards and carries a schedule of conditions of safe use. It is not a legal requirement in most countries on its own, but many national schemes accept it as the technical basis.
The IECEx certificate for the IS-04Z1 is in progress and has not been issued. The marking target is Ex ib IIC T4, the intrinsic safety concept for Zone 1 gas with the hardest gas group (IIC) and a 135 °C temperature class.
In Yeosu. Yeosu's complex relies on overseas technology licensors and specialist contractors for large projects. IECEx gives them a single certificate of conformity and schedule of conditions to review. The IS-04Z1 has neither document yet, since certification is in progress, so only the planned route can be discussed.
The route · specification
Specifying an IECEx smartphone for Yeosu
A short checklist for anyone writing or reviewing the specification, with the IS-04Z1 status against each point.
Check on the paper
- Marking
- Equipment group, category, protection concept, gas group and temperature class, matched to the area drawing.
- Certificate and schedule
- A certificate number, issuing body and the schedule of conditions, not a brochure claim.
- Standards edition
- The IEC 60079 or national standard edition the certificate was issued against.
Check for the IS-04Z1
- Marking target
- II 2 G Ex ib IIC T4: a target, not yet a certificate.
- Certificate status
- IECEx, ATEX, UKEX and NEC 500 in progress; none issued.
- Operator approval
- Separate from the certificate and handled with the site operator.
Questions · Yeosu
Frequently asked questions
Can we buy an IECEx smartphone in Yeosu today?
No. Nothing can be bought or taken into a classified area today: certification is in progress and launch is planned for Q4 2026. What is available now is the datasheet, the written certification schedule and evaluation units for safe-area use.
What does an IECEx smartphone in Yeosu cost?
No price is published. While certification is in progress there is no list price and no committed lead time, and a supplier quoting a firm figure for an uncertified Ex handset is promising something it cannot stand behind. Indicative pre-launch pricing is issued in writing against a stated quantity and site.
Does the IS-04Z1 hold an IECEx certificate?
No. The IECEx certificate is in progress and has not been issued. SAMS will publish the number when it exists.
Which areas at Yeosu would use it?
Likely candidates are refinery process units, ethylene cracker and polymer plants, chemical storage tank farms, marine loading jetties. Which areas are classified, and to what zone, is set by the site operator's own area classification drawings.
Is intrinsically safe the same as explosion proof?
Not exactly. Explosion proof is a broad everyday term; intrinsic safety is one protection concept, which limits energy so ignition cannot occur. Flameproof (Ex d) is a different concept that contains an explosion. The IS-04Z1 is intrinsically safe by design.
What are the main hazardous-area risks at the Yeosu complex?
Refining units, a heavy-oil upgrading facility, an olefins cracker, aromatics and polypropylene plants together create flammable vapour and gas areas, including ethylene and aromatic hydrocarbons. The operator sets zones and gas groups, so ask for classification drawings before bringing devices.
Is Yeosu convenient for equipment delivery?
The city has an industrial port coast and rail and road links to Gwangju and other Korean cities, so delivery is feasible, though customs and approvals take time for imported electronics. Confirm lead times with your forwarder and the site's gate rules.
Will the restructuring at Yeosu change who approves equipment?
It may. A restructuring plan involving Lotte Chemical's Yeosu operations was approved, and its status could change. Procurement and HSE contacts may be in transition. Confirm requirements with the site operator before sending any documents.
Related guides
Keep exploring
More on Yeosu, and on other places in South Korea.
Explosion-Proof Mobile Phone Distributor in YeosuSame place, different guide
Ex-Proof Mobile Phone Distributor in YeosuSame place, different guide
Industrial Mobile Phone in YeosuSame place, different guide
Intrinsically Safe Mobile Phone in YeosuSame place, different guide
Rugged Mobile Phone Distributor in YeosuSame place, different guide
Hazardous Area Mobile Phone Distributor in YeosuSame place, different guide
ATEX and IECEx Mobile Phone Distributor in IncheonElsewhere in South Korea
ATEX and IECEx Mobile Phone Distributor in BusanElsewhere in South Korea
ATEX and IECEx Mobile Phone Distributor in UlsanElsewhere in South Korea
ATEX and IECEx Mobile Phone Distributor in PohangElsewhere in South Korea
South Korea market guideCertification route and regulators
All guides for South KoreaEvery route we cover
Certification statusWhat is in progress
Enquiry · Yeosu
Ask about the IS-04Z1 for Yeosu, South Korea
Send the site, zone and gas group and roughly how many handsets. We reply by email with the datasheet and the certification schedule.
Enquiry · Yeosu
Launching Q4 2026
Planning for Yeosu?
Send the zone and gas group of your site and we will reply with the datasheet and schedule.