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Industries · Zone 1 / Zone 21 · gas and dust

A hazardous area mobile phone, industry by industry

The same handset does a different job on a gas plant, in a coal mine and in a sterile powder suite. This page sets out the real hazard in each sector and the work a Zone 1 and Zone 21 device is actually doing there.

IS-04Z1 launching Q4 2026 · certification in progress

SAMS IS-04Z1 intrinsically safe smartphone, front view
The common problem

Why the phone in a worker’s pocket is a safety question

Fuel, oxygen and an ignition source

An explosive atmosphere needs fuel, oxygen and an ignition source. Plants spend enormous effort on the first two, through containment, ventilation, inerting and detection. The third is where portable electronics come in. An ordinary smartphone contains a lithium cell, a charging circuit, radio power amplifiers and connectors that can arc, and none of it is designed with an ignition threshold in mind. That is why site rules class it as unauthorised equipment inside a classified area.

The compromise on most sites

The result on most sites is a compromise nobody is happy with. Either people leave the phone at the gate and lose the tools that make modern work possible, or the phone goes into a pocket anyway and the rule quietly stops being enforced. Meanwhile the work itself has moved onto software: permits, isolations, rounds and readings, defect capture, asset tags, drawings, video support from a specialist who is a thousand kilometres away.

Closing the gap

An intrinsically safe smartphone closes that gap by being the one device that is allowed past the gate and is also worth carrying. The zones and the dust groups differ by sector, and so do the practical demands, from ambient temperature to whether the user is wearing three layers of gloves. The sections below are organised by what actually changes.

By sector

Six sectors, six different jobs

In each case the hazard defines the certification and the operating conditions define whether the device survives the year. Both have to be right.

01

Oil and gas

  • Zone 1
  • IIC · hydrogen
  • 12 h shift

Upstream fields, gas processing, terminals and offshore platforms sit under continuous hydrocarbon risk, with Zone 1 across wellheads, separators, flowlines, pump rooms and loading arms, and gas group IIC wherever hydrogen is present. The work is rounds, first line maintenance, permit sign-off and inspection, often kilometres from the control room. Four-constellation GNSS puts a defect on a coordinate rather than a description, and a 4,000 mAh battery has to carry a twelve hour shift because there is no charging inside a classified area.

02

Petrochemical and chemical

  • Zone 1
  • Zone 21 dust
  • Turnarounds

A cracker, an olefins train or a fine chemicals plant mixes flammable vapour with solvent handling and, in polymer, catalyst and fertiliser areas, combustible dust. This is where a device designed for Zone 1 alone starts to fail the specification and Zone 21 matters. The job is operator rounds, sampling, isolation checks and turnaround coordination, where the number of contractors on site multiplies and every crew signing out one handset instead of a radio, a camera and a torch is a measurable saving.

03

Mining

  • Methane & coal dust
  • Zone 21
  • IP68

Coal mining brings methane and coal dust together, which is the classic ignition case, and hard rock and mineral processing bring Zone 21 dust from crushing, conveying and milling. Underground adds poor coverage, heavy vibration and constant water. A rugged intrinsically safe handset here is doing shift handover, ventilation and gas readings, plant condition reporting and, critically, lone worker and emergency communication. IP68 sealing and a rugged build are not marketing lines in this sector, they are the difference between a device that lasts and one that is replaced quarterly.

04

Power generation

  • IIC · hydrogen
  • Zone 21 dust
  • Outage work

Gas-fired and dual-fuel stations have classified areas around fuel gas skids, gas receiving stations, fuel oil handling and hydrogen-cooled generators, where hydrogen makes gas group IIC a genuine requirement rather than a nice-to-have. Coal and biomass plants add substantial Zone 21 dust in milling, conveying and silo areas. The device supports outage work, thermographic and visual inspection, switching support and the constant flow of photographs that feed a defect list.

05

Pharmaceutical and life sciences

  • Zone 1 / 2
  • Zone 21 / 22
  • Wipe-down · IP68

Solvent handling in API and formulation suites creates Zone 1 and Zone 2 areas, and powder handling, granulation, milling and dispensing create Zone 21 and Zone 22. On top of the explosion risk sits a regulated environment: cleaning regimes, gowning, and documentation that has to be complete and attributable. IP68 sealing matters for wipe-down, the camera captures batch and deviation evidence, and MDM control over that camera keeps a device compliant with site data policy.

06

Marine and offshore

  • Salt spray & damp
  • Class society
  • Shore video link

Tankers, gas carriers, FPSOs, drilling units and offshore wind service vessels carry classified areas around cargo tanks, pump rooms, hose handling stations and inert gas systems, in salt spray, vibration and permanent damp. Crews work far from support, so the handset is doing tank inspection records, cargo operations, maintenance under a class regime, and a video link to a shore-based superintendent. Bear in mind that marine service usually brings its own class society and flag state requirements on top of Ex certification, and those are checked per vessel.

Matching the device to the area

How to specify for your plant rather than for the brochure

  1. 01

    Start from the classification drawing

    Start from the hazardous area classification drawing, not from a product page. It gives you three things: the zone, which fixes the equipment category; the gas group or dust group, which fixes IIA, IIB or IIC and the equivalent dust groups; and the temperature class, which caps the maximum permitted surface temperature. Those three, read together with the ambient temperature range at your site, decide what equipment is admissible. Everything else is preference.

  2. 02

    Read it against the IS-04Z1 target

    The IS-04Z1 is designed for Zone 1 and Zone 21, with an ATEX marking target of II 2 G Ex ib IIC T4. Read against a classification drawing that means gas areas where an explosive atmosphere is likely in normal operation, the most demanding gas group, and a surface temperature capped at 135 degrees Celsius. If your area is Zone 0, or if your process requires T5 or T6, this is not the right device and we will tell you so rather than sell you one.

  3. 03

    Check what the certificate does not cover

    Then consider the conditions the certificate does not cover. Whether people work in gloves, whether the display has to be readable in direct sun, whether there is any charging opportunity during a shift, whether coverage exists at the far end of the site or whether the device has to work offline and sync later, and which applications the device has to run. Those questions decide adoption, and adoption decides whether the fleet is used or drawered.

  4. 04

    Decide the management model early

    Finally, decide the management model early. An ex phone that enrols into your existing EMM or MDM console, takes the corporate profile and reports into the same compliance tooling as the office estate is a small addition to an IT roadmap. One that has to be managed by hand is a project.

IS-04Z1 design target

II 2 G Ex ib IIC T4

  • Zone 1 gas · Zone 21 dust
  • Gas group IIC · most demanding
  • Surface temperature ≤ 135 °C (T4)
  • Not for Zone 0
  • Not for T5 or T6 processes
Questions

Industry questions

Asking about your own site?

Send your site, zone and gas group, and we will answer for your plant rather than in general.

Ask about your site →
Which industries is the IS-04Z1 designed for?

Any site with Zone 1 gas or Zone 21 dust areas, which in practice means oil and gas, petrochemical and chemical, mining and mineral processing, power generation, pharmaceutical and life sciences, and marine and offshore. Grain, sugar, wood and metal powder handling fall under the same Zone 21 logic.

Do I need a Zone 21 device or is Zone 1 enough?

If your site handles powders, polymers, fertiliser, grain, coal, phosphate or metal dust anywhere the workforce carries the phone, you need the dust rating as well. A great many hazardous area phones are gas only, which is why plants end up specifying two devices. The IS-04Z1 is designed for both.

Can I use it in a Zone 0 area?

No. The design target is Zone 1 and Zone 21. Zone 0 requires a higher equipment category and is not part of this programme.

Is it suitable for underground coal mining?

Underground mining is equipment group I under the ATEX and IEC systems, a separate category from the surface industry group II that this device targets, and most jurisdictions add their own mining approvals. Surface mining and mineral processing areas classified as Zone 1 or Zone 21 are within scope. Tell us the site and we will answer specifically.

Will it work offshore and at sea?

It is designed for the conditions, with IP68 sealing and rugged build. Vessel use normally also involves class society and flag state acceptance in addition to Ex certification, so that is checked per vessel and per operator rather than assumed.

Can our existing permit and rounds apps run on it?

It runs Android 16 with enterprise management, so ordinary Android enterprise applications should install and run normally. Where an app depends on specific hardware such as a barcode engine or a particular accessory connector, ask us first, because those details are to be confirmed at launch.

Can we trial it on our site before launch?

Yes, in safe areas. Evaluation units can be arranged for handling, MDM enrolment and application testing ahead of launch, with classified-area pilots beginning once the certificate covering the area is issued. Send your site, zone and gas group to start that conversation.

Launching Q4 2026

Talk to the SAMS team.

Datasheets, the certification schedule and distributor enquiries all reach the same team.