Climate
Houston has a humid subtropical climate with long hot summers and exposure to Gulf hurricanes and flooding, which shapes outdoor work and turnaround planning.
Houston · Ex-proof
Ex-Proof Smartphone in Houston
Houston is 165 miles east of Austin, 88 miles west of the Louisiana border and 250 miles south of Dallas, which makes it a natural road hub for Gulf Coast plants. Zone 1 and Zone 21 areas arise at process units, tank farms and loading docks along the channel. If you are specifying an Ex-proof smartphone for Houston and the Houston Ship Channel, this page covers the markings, the approvals and the current certification status of the IS-04Z1.
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 topicEx-proof
DeviceSmartphone
RouteSpecification
WhereHouston
Short answer. The SAMS IS-04Z1 is the intrinsically safe smartphone covered here for Houston and the Houston Ship Channel: pre-launch, designed for Zone 1 and Zone 21 (marking target Ex ib IIC T4), with certification in progress and no certificate issued.
For the record, no certificate exists for the IS-04Z1 today. The programme is under way ahead of a Q4 2026 launch. Operator approval runs on its own timeline. Certification status. Place facts reviewed October 2026.
At a glance · Ex-proof
Checklist: Ex-proof smartphone for Houston and the Houston Ship Channel
| Check | What to look for | IS-04Z1 today |
|---|---|---|
| Ex marking | Group, category, protection concept, gas group, temperature class | II 2 G Ex ib IIC T4 (target) |
| Gas group | IIA, IIB or IIC matched to the area drawing | IIC (target) |
| Temperature class | T-class below the ignition temperature of the gas | T4, 135 °C (target) |
| Where it applies | Houston and the Houston Ship Channel: Refinery process units, Petrochemical plants, Tank farms | Classified by the site operator |
Product · Houston
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 Houston. 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 · Houston and the Houston Ship Channel
Houston and the Houston Ship Channel at a glance: who is there, what is classified
A short profile of the site and the kinds of classified area that matter for portable equipment.
Operators and companies on site
- ExxonMobil (Baytown refinery)
- Pemex (Deer Park refinery)
Classified areas to expect
- Refinery process units
- Petrochemical plants
- Tank farms
- Dock and terminal loading areas
Local conditions · Houston and the Houston Ship Channel
Conditions in Houston and the Houston Ship Channel that affect handheld equipment
Scale
The channel is roughly 50 miles long and is described as the second-largest petrochemical complex in the world. Port Houston operates eight public facilities along it.
Field notes · Houston and the Houston Ship Channel
More about Houston and the Houston Ship Channel that matters for portable equipment
Houston and the Houston Ship Channel: geography and layout
Houston sits on flat Gulf coastal plain, and the flat terrain together with extensive development has worsened flooding, which can affect low-lying sites and access roads in heavy rain.
Houston and the Houston Ship Channel: geography and layout
The channel runs from the Turning Basin about four miles east of downtown Houston to a Gulf gateway between Galveston Island and the Bolivar Peninsula.
Houston and the Houston Ship Channel: background
The modern port was approved by Harris County voters in 1909 and opened in November 1914, partly because an inland port was seen as safer after the 1900 Galveston hurricane.
Houston and the Houston Ship Channel: climate and equipment wear
Houston has a humid subtropical climate, with highs of at least 90 degrees Fahrenheit on an average of 106.5 days a year and winds from the south and southeast carrying Gulf moisture.
The term · Ex-proof
What “Ex-proof” means for a smartphone
“Ex-proof” is shorthand for equipment carrying an explosion-protection marking (the Ex mark) that matches the area it enters. The marking states the protection concept, gas or dust group and temperature class, and it must be backed by a certificate issued by a recognised body, so a phone described as Ex-proof should come with a certificate number you can check.
The IS-04Z1 is designed to carry the marking II 2 G Ex ib IIC T4. That is a target: certification is in progress, no certificate has been issued, and SAMS will publish the certificate numbers when they exist.
In Houston and the Houston Ship Channel. At refinery units and loading docks on the channel, a marking check would read the zone, gas group and temperature class against the operator's classification. The IS-04Z1 target marking is II 2 G Ex ib IIC T4, aimed at Zone 1 gas atmospheres. Dust areas, where Zone 21 arises, would need a separate assessment rather than assumption.
The route · specification
Specifying an Ex-proof smartphone for Houston
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 · Houston
Frequently asked questions
Can we buy an Ex-proof smartphone in Houston 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 Ex-proof smartphone in Houston 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.
What Ex marking will the IS-04Z1 carry?
The marking target is II 2 G Ex ib IIC T4. It becomes a marking only when the certificate is issued; until then it is a design target.
Which areas at Houston and the Houston Ship Channel would use it?
Likely candidates are refinery process units, petrochemical plants, tank farms, dock and terminal loading areas. 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.
Why is flooding a planning point for Houston plant visits?
Flat terrain and heavy rain can cause local flooding on roads and low-lying areas. Operators usually have severe-weather plans, so allow extra travel time, keep equipment in waterproof cases when transporting, and ask the site about access arrangements.
What is the best way to source equipment for Houston-based teams?
Houston has many engineering and procurement firms and a major port and airports, so shipping is straightforward. Agree lead times and local support with the supplier, and confirm which area classification and approval marks your client's plant requires.
How does Gulf Coast weather affect handheld use here?
Houston has long hot summers, humidity, and exposure to hurricanes and flooding, which shapes outdoor work and turnaround planning. IP68 protects against dust and water ingress, but a battery in heat still needs sensible handling, and charging belongs in safe areas. Ask the operator about local rules on storm preparation and equipment storage.
Related guides
Keep exploring
Related guides for Houston and for United States.
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Explosion-Proof Mobile Phone in HoustonSame place, different guide
Industrial Mobile Phone in HoustonSame place, different guide
Rugged Mobile Phone Distributor in HoustonSame place, different guide
IECEx Mobile Phone in HoustonSame place, different guide
Hazardous Area Mobile Phone in HoustonSame place, different guide
ATEX and IECEx Mobile Phone Distributor in Lake Charles LouisianaElsewhere in United States
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United States market guideCertification route and regulators
All guides for United StatesEvery route we cover
Certification statusWhat is in progress
Enquiry · Houston and the Houston Ship Channel
Ask about the IS-04Z1 for Houston and the Houston Ship Channel, United States
Share the site details and quantity. You will get the datasheet and the certification schedule back by email; pricing is indicative only until launch.
Enquiry · Houston and the Houston Ship Channel
Launching Q4 2026
Planning for Houston?
Send the zone and gas group of your site and we will reply with the datasheet and schedule.