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Early access — £89 (was £129)

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POSISYS™ — UK Registered Trade Mark UK00004343983

Stop Guessing.
Start Knowing.

The world's first dedicated study app for Ex01–Ex04 Gas & Vapours assessment. Built by a Senior E&I Engineer who's sat the exam — for engineers who are serious about passing.

Pre-Order Now — £89 → See How It Works
Early access engineers already preparing Lock in the £89 price before general release
Trusted by E&I Engineers Across UK Industry
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Years of hazardous-area experience built in
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Questions in the full timed mock exam
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Years renewing? The Refresh Pack has you covered
The Reality

Three Reasons Good Engineers Still Fail

The exam doesn't care how long you've been on site. The preparation options haven't changed in twenty years.

📄

Scattered Resources

Revision material exists as printed handouts from the last course, a few saved PDFs, and whatever you can remember. Nothing interactive. Nothing that shows you where your knowledge has actually drifted over five years.

🔍 No structured study path exists for this exam — until now
🎯

No Way to Find Gaps

You don't know what you don't know — until the examiner tells you. There's no diagnostic tool, no mock paper, no way to simulate the written assessment before you're sitting in that room.

⚠️ Most failures are on theory, not practical competence
⏱️

Experience Isn't Enough

Twenty years on site and you still need to know which gas group acetylene sits in, off the top of your head, under exam pressure. Theory drifts. Gas group tables blur. The written paper catches experienced engineers every single year.

💸 Resitting costs time, money, and professional credibility
Simple Process

Three Steps From Purchase to Prepared

No App Store friction, no complex setup. You're studying within minutes of buying.

1

Pre-Order or Buy

Pay once. £89 locks in lifetime access to Ex01–Ex04 Gas & Vapours. No subscription, no renewal, no hidden fees — ever. Early access price holds permanently.

2

Install in Seconds

We email you the link. Open it on your phone, tap "Add to Home Screen" — done. No App Store account. Works on iPhone, Android, any tablet. Offline from the start.

3

Study, Track, Pass

Adaptive questions target your exact gaps. Timed mock exam simulates the real thing. Walk in having already done it once — with real confidence this time.

The POSISYS™ Difference

Three Pillars. One App.

Every feature is built around the three things that actually determine whether you pass.

🎯

Know What You Don't Know

The adaptive engine tracks every answer. It identifies weak areas and gives you more questions on those topics — less time wasted on what you already know cold.

Adaptive questions Weak-area tracking Progress dashboard
💡

Understand It, Don't Just Memorise

Every question has a full explanation — why the right answer is right, why the wrong answers are wrong, and the principle that sits behind it. Engineers who understand pass. Engineers who memorise don't.

Full explanations Referenced to standards Plain English
⏱️

Simulate the Real Thing First

60 questions. Time pressure. No hints. The mock exam puts you in assessment conditions before assessment day. Walk in having already done it once — knowing exactly where you stand.

60-question mock Timed conditions Instant results
Featured Result

From "I'll wing it" to First-Time Pass

James had 18 years on site and hadn't revised properly in a decade. Two failed attempts behind him. He used POSISYS™ for three weeks before his third sitting — adaptive study, three mock exams, and a clear picture of exactly where his theory had drifted.

He passed first time that cycle. The mock exam format meant he walked in knowing exactly what to expect.

0
Weeks of preparation
0
Mock exams completed
1st
Time passing that cycle
Get the Same Preparation →
James T. · E&I Lead · Teesside · 3rd attempt
📊
Day 1: POSISYS identifies zone classification and gas groups as the two biggest gaps. Not what James expected.
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Week 1–2: Adaptive study focuses time on weak areas. Explanations clarify the "why" behind each standard — not just the answer.
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Week 3: Three full mock exams under timed conditions. Score goes from 41/60 to 53/60.
✅
Assessment day: Walked in calm. Recognised every question type. Passed.
"Sat the mock exam three times before the real thing. Walked in knowing exactly what to expect. First time passing in one go — after two failed attempts over the years."
Is This For You?

Radical Honesty. Before You Buy.

POSISYS™ is the right tool for the right engineer. Here's exactly who it's built for — and who it isn't.

✅

We're a Great Fit If You…

Right Fit
  • ✓Have an Ex01–Ex04 assessment coming up or due at year 5
  • ✓Know the practical side but want to sharpen your theory
  • ✓Have failed before and want to understand why — and fix it
  • ✓Want to study on the go: on site, offline, at odd hours
  • ✓Want to understand the standards, not just memorise answers
  • ✓Appreciate honest, straight-talking preparation built by an engineer
❌

We're Not a Fit If You…

Not a Fit
  • ✗Want an approved certification body course (this is a prep tool, not a course)
  • ✗Expect overnight results without putting in study time
  • ✗Want face-to-face teaching — POSISYS™ is self-directed
  • ✗Are looking for a replacement for the official assessment programme
  • ✗Prefer a classroom environment over mobile, self-paced study
What Engineers Say

Built for Engineers. Trusted by Engineers.

Early access members preparing with POSISYS™.

3 weeks before resit · Zone Classification gap
★★★★★

"I'd been putting off studying for weeks. POSISYS flagged zone classification as my biggest gap on day one — exactly what I needed to hear. Stopped guessing, started fixing."

Mike R.
Senior Instrumentation Engineer · Aberdeen
3rd attempt · Used mock exam 3× before the day
★★★★★

"Sat the mock exam three times before the real thing. Walked in knowing exactly what to expect. First time passing in one go — after two failed attempts over the years."

James T.
E&I Lead Technician · Teesside
18 years' experience · Theory confidence was the gap
★★★★★

"The explanations behind each answer are where this earns its money. I wasn't just memorising — I was finally understanding the standard properly. That's what makes the difference on paper."

Sarah L.
Electrical Engineer · Grangemouth
Darren Emery M.Sc., Founder — The Engineering University
Darren Emery M.Sc.
Senior E&I Engineer · Technical Authority · Founder, TEU
20+
Years on site
Ex01
–04 Certified
TA
Tech Authority
Built By Someone Who's Been There

Not a Training Company. An Engineer Who Built the Tool He Wished Existed.

I've sat the Ex01–Ex04 Gas & Vapours assessment myself — multiple times across certification cycles. Every five years the industry sends experienced engineers back through the same process, and every five years those engineers prepare alone with whatever notes they can find.

There was no dedicated study app. No way to know where the gaps were before sitting in front of the examiner. I spent 20+ years in hazardous-area environments — including Tata Steel and major UK industrial sites — and got tired of watching skilled engineers fail on theory they used to know cold.

POSISYS™ is what I'd have wanted. Built from real exam knowledge, for how engineers actually learn.

  • ✓Senior E&I Engineer — 20+ years in hazardous-area environments including Tata Steel
  • ✓Technical Authority — responsible for engineering standards on hazardous-area installations
  • ✓Multiple Ex01–Ex04 Gas & Vapours assessments passed across certification cycles
  • ✓Director, Saving Energy Consultants Limited · POSISYS™ UK Registered Trade Mark UK00004343983
"I've watched engineers with 25 years' experience sit in front of an examiner and not be able to recall a gas group table they used to know cold. That's not incompetence — that's what five years does. I built POSISYS™ so that never has to happen to you."
— Darren Emery M.Sc. · Founder, The Engineering University
Pricing

Simple, Honest Pricing

Pay once. Own it forever. No subscriptions, no upsells, no renewals.

🔥 Early Access Price
POSISYS™ Pro
Ex01–Ex04 Gas & Vapours — Full Access
£89 £129

One-time payment · Lifetime access · No subscription ever

  • ✓Complete Ex01–Ex04 Gas & Vapours question bank
  • ✓Adaptive study mode — learns your weak areas
  • ✓Full timed mock exam — 60 questions, exam conditions
  • ✓Detailed explanation on every single question
  • ✓Offline access — works without internet
  • ✓Progress dashboard & weak-area tracking
  • ✓PWA install — any phone or tablet, no App Store
  • ✓All future content updates for this module
Pre-Order Now — £89

Secure checkout via Stripe · Instant access email

POSISYS™ Refresh Pack
For Engineers Resitting at Year 5
£49

One-time · Add on whenever you need it

  • ✓Fresh question sets — not repeats from your first buy
  • ✓Updated content reflecting current exam standards
  • ✓Targeted refresher for returning candidates
  • ✓Same adaptive engine — pinpoints gaps fast
  • ✓Offline access included
  • ✓Not locked to year 5 — buy whenever you need it
Buy Refresh Pack — £49

Secure checkout via Stripe · Instant access email · All prices include VAT where applicable

Free Resources

Three Ways to Start for Free

No account, no email required. Useful material — on us.

📐
Free Download

Ready Reckoner

Key reference tables, gas group data, temperature classifications, and zone definitions — one printable reference sheet. The kind of thing you wish you'd had in the exam room.

Download Free ↓
📖
Free Guide

Pre-Course Study Guide

Structured coverage of the core theory areas in Ex01–Ex04. Perfect for the weeks before your course starts — or to check where knowledge has drifted since last time.

Download Free ↓
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Free Quiz

Readiness Snapshot

10 targeted questions. Know exactly where your gaps are before the exam finds them. 5 minutes. Your personalised result is emailed to you — no purchase needed.

Take the Snapshot →
Questions Answered

Frequently Asked Questions

Straight answers. No waffle.

Ex01–Ex04 is the Gas & Vapours competence module within the hazardous-area assessment programme for electrical and instrumentation engineers working in ATEX/BS EN environments. It covers zone classification, equipment selection, installation, inspection, and maintenance — and must be renewed every five years.
POSISYS™ is an independent study aid produced by Saving Energy Consultants Limited. It is not affiliated with, endorsed by, or approved by any certification body or assessment organisation. It is a preparation tool — not a replacement for the official assessment programme itself.
No. POSISYS™ is a Progressive Web App (PWA). After purchase you receive a link by email. Open it on your phone, tap "Add to Home Screen" — it installs instantly, works offline, and behaves exactly like a native app. No App Store account, no Google Play, no permissions needed.
This was built specifically for you. Strong practical ability, theory that has drifted over five years, not much time to revise. The adaptive engine finds your exact gaps so you don't waste time on what you already know cold. Most experienced candidates fail on theory, not practical — POSISYS™ fixes that specifically.
As soon as the app is live, early access customers are notified first. Your £89 price is locked in permanently — the standard price rises to £129 at general release and you will never be charged the difference. You will be the first to know when the app is ready.
Your lifetime Pro access includes all future content updates for the Ex01–Ex04 module. When year 5 arrives, the optional Refresh Pack (£49) gives you entirely new question sets and updated material — not repeats from your original purchase. It's available at any time, not just at year 5.

Don't Leave Your Pass to Chance.

Walk in prepared. Walk out certified. One app. One payment. Lifetime access.

Pre-Order POSISYS™ — £89 → Try Free First

No subscription. No App Store. No sales call. Just the preparation that works.