PTT: industry on the ground
PTT opened the Bangchak oil refinery in Bangkok in 1985 and built a nationwide network of fuel distribution outlets, adding refinery and retail forecourt areas to its estate.
PTT · explosion proof
Explosion-Proof Mobile Phone for PTT
PTT is Thailand's state-controlled national energy company, with the Ministry of Finance holding 51.1%. In 2012 PTT Exploration and Production took over Cove Energy, which held an 8.5% share in a large offshore natural gas field in Mozambique, extending PTT's offshore gas work abroad. This page explains what to look for in an explosion proof mobile phone for PTT, 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 topicexplosion proof
DeviceMobile Phone
RouteSpecification
WherePTT
Short answer. The SAMS IS-04Z1 is the intrinsically safe smartphone covered here for PTT: pre-launch, designed for Zone 1 and Zone 21 (marking target Ex ib IIC T4), with certification in progress and no certificate issued.
Where things stand: the IS-04Z1 has not launched, and none of its four certification routes has produced a certificate yet. A buyer's engineering review is separate from the certificate. Certification status. Place facts reviewed October 2026.
At a glance · explosion proof
Checklist: explosion proof mobile phone for PTT
| Check | What to look for | IS-04Z1 today |
|---|---|---|
| Protection concept | Flameproof (Ex d) or intrinsic safety (Ex i) | Intrinsic safety, level ib |
| Zone suitability | Zone 1 gas and Zone 21 dust | Design target for Zone 1 and 21 |
| Certificate | Number, issuing body and schedule of conditions | In progress; not issued |
| Where it applies | PTT: Gas separation plants, Gas pipelines and receiving facilities, LPG terminals | Classified by the site operator |
Product · Thailand
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 Thailand. 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 organisation · PTT
PTT Public Company Limited and the IS-04Z1
Where it operates and the kinds of classified area a handset would meet there.
Sites and areas
- Map Ta Phut, Rayong
- Gulf of Thailand gas pipelines
Classified areas
- Gas separation plants
- Gas pipelines and receiving facilities
- LPG terminals
- Group refineries and petrochemical units
Supplier approval · PTT
How suppliers reach PTT
Supplier registration and equipment approval are run by the organisation itself; confirm current requirements with its procurement and HSE teams. The Ex certificate and an organisation's own vendor or engineering approval are two separate timelines; SAMS is working towards both and holds neither today.
Field notes · PTT
More about PTT that matters for portable equipment
PTT: who works there
Affiliated companies include PTT Exploration and Production, PTT Global Chemical and PTT Green Energy, so upstream, petrochemical and power sites each have their own operating teams and procurement.
PTT: infrastructure
PTT owns extensive submarine gas pipelines in the Gulf of Thailand and a network of LPG terminals across the country, so offshore pipelines and LPG storage sites are key hazardous-area locations.
PTT: background
Between 1981 and 1983 the authority built Thailand's first gas transmission pipeline linking the Erawan and Bongkot fields with the Bang Pakong and South Bangkok power plants, starting gas-based power generation.
The term · explosion proof
What “explosion proof” means for a smartphone
“Explosion proof” is the phrase most buyers use for equipment that may be taken into a classified hazardous area. Strictly, it covers several protection concepts: a flameproof enclosure (Ex d) contains an internal explosion, while intrinsic safety (Ex i) limits electrical energy so that an ignition cannot start. Phones are normally intrinsically safe, because a flameproof handset would be too heavy to carry all shift.
The IS-04Z1 uses intrinsic safety, with a marking target of Ex ib IIC T4, and is designed for Zone 1 and Zone 21. It is pre-launch, certification is in progress and no certificate has been issued.
In PTT. Gas separation, LPG terminals and petrochemical units show how explosion-proof covers different concepts. Flameproof Ex d is for fixed equipment, while intrinsic safety suits handhelds. A phone relies on the second, and the target marking is II 2 G Ex ib IIC T4, subject to certification.
The route · specification
Specifying an explosion proof mobile phone for PTT
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 · PTT
Frequently asked questions
Can PTT buy the IS-04Z1 today?
Not yet. The IS-04Z1 is pre-launch and its certification is still in progress ahead of a Q4 2026 launch. No unit goes into a classified area before the certificate covering it exists. The datasheet, the certification schedule and safe-area evaluation units are available now.
What does an explosion proof mobile phone for PTT cost?
There is no list price yet. SAMS gives indicative pre-launch pricing in writing, against a stated quantity and site, and does not commit to a lead time before certification completes.
Is the IS-04Z1 explosion proof or intrinsically safe?
It is intrinsically safe (marking target Ex ib IIC T4), which is the usual way to make a phone for hazardous areas. It is not a flameproof (Ex d) design, and certification is still in progress.
How does PTT approve suppliers?
Supplier registration and equipment approval are run by the organisation itself; confirm current requirements with its procurement and HSE teams.
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.
Which PTT group sites typically need intrinsically safe handhelds?
Typical sites include offshore production platforms and gas receiving terminals, LPG terminals, refineries, petrochemical complexes and fuel stations. Zoning is facility-specific, so ask the operating subsidiary's HSE team for area classification drawings and its portable-electronics rules before specifying devices.
Is PTT or a subsidiary the right buyer for Ex equipment?
Because most employees and operations sit in subsidiaries such as PTT Exploration and Production or PTT Global Chemical, each often runs its own procurement and HSE approval. Identify the operating company for the site and confirm its supplier registration and certification requirements.
Does approval at PTT cover its group companies?
Not necessarily. The sheet notes that refining and petrochemicals are run by group companies, not PTT itself, and that supplier registration and equipment approval are run by the organisation. Confirm which entity applies with its procurement and HSE teams. The IS-04Z1 has no certificate yet.
Related guides
Keep exploring
Other guides for PTT, other places in Thailand, and the pages behind them.
ATEX and IECEx Mobile Phone Supplier for PTTSame place, different guide
Intrinsically Safe Mobile Phone Supplier for PTTSame place, different guide
IECEx Mobile Phone for PTTSame place, different guide
Explosion-Proof Mobile Phone Supplier for PTTSame place, different guide
Thailand market guideCertification route and regulators
All guides for ThailandEvery route we cover
Certification statusWhat is in progress
Enquiry · PTT
Ask about the IS-04Z1 for PTT, Thailand
Tell us what you need to equip and where. The SAMS team answers by email with the datasheet and where each certification route stands.
Enquiry · PTT
Launching Q4 2026
Planning for PTT?
Name the site and the operator and we will send what is available before launch.