Welcome to Arobase Limited

Scientific Services

Today the concept of multi skilled, environmental and safety services has washed into many industries. As a result the modern Health, Safety and Environment (HSE) worker needs a broad range of knowledge and skills to call upon.

But with the workplace becoming evermore technical, having the right contacts who you can call upon for help is essential. The question is however, who can you trust?

Media such as linkedIn and facebook can be helpful, but you often get conflicting advice and opinions. Here at Arobase, we do the work for you, providing simple scientific advice while working in your best interest. If we don’t know the answer, or provide the service, then we will find someone that does and put in touch with one another. For more about what we are about follow the link.

Although based in Bristol we providing support to organisations around the globe.


Bristol & Bath – Gas Detector Hire

Hire of personal and portable pumped gas detectors in the Bristol and Bath areas.

Arobase limited currently have 2 gas detection models to choose from. The pumped Draeger X-am 7000 as seem above and and personal X-am 2000/2500 shown below.

Each instrument contains 4 sensors: flammables, oxygen, hydrogen sulphide and carbon monoxide. Additional sensors can be added to the X-am 7000 to suit your needs.

We calibrate and check the devices are working correctly before dispatch so you can have confidence in the instruments you choose.This is a neat, compact and robust unit with 4 gas capability and rated to IP67. It is one of a new generation of gas detectors with a neat ergonomic design mobile phone dimensions and a low weight.


Hire of X-am 2500Features

  • 3 or 4 Gas – CH4/O2/H2S/CO
  • IP67 – dust-proof and watertight for 30 minutes at depths of up to 1 metre
  • Gas inlets on two surfaces, improving gas sensitivity
  • Acoustic / visual / vibration alarm
  • Strong metal clip
  • Weight: 220g
  • Operating Time: 12 hours +
  • Charging Time: 4 hours or less
  • Datalogging: Last 1000 hours
  • ATEX II 2G EEx iad IIC T4/T3
  • Optional 12v/24v vehicle charger

Arobase also provides free user training and delivery within the Bristol and Bath post codes if required.


Terms and Conditions of Hire

  1. These terms and conditions shall apply to any hire transaction between Arobase Limited (the owner) and the customer unless any variation is agreed and accepted by the owner in writing.
  2. The period of hire is defined to start from the day after the day of despatch from our offices and to terminate on the day of receipt at our offices in Bristol.
  3. The rental period startson the day after despatch.
    The rental period ends on the day before receipt back at our offices.
Short Term 3 Days
1 Week 7 Days
2 Weeks 14 Days
3 Weeks 21 Days
4 Weeks 28 Days


  1. The period of hire shall be a minimum of three days and thereafter from week to week. Notice of termination of hire shall be one week given in writing by either party at any time.
  2. The equipment shall remain the property of the owner and is supplied to the customer only on a rental basis without any residual value.
  3. During the hire period customers shall be responsible for the following:
    1. To arrange at the customer’s expense, adequate insurance cover for the equipment to cover loss or damage until received by the owner and accepted with an approved signature.
    2. To keep the equipment in good condition and ensure it is not subject to misuse (fair wear and tear excepted).
    3. To immediately notify the owner in writing of any loss or damage to the equipment. The customer shall be liable for such loss or damage and rental shall continue to be chargeable until settlement for such loss or damage is made to the owner.
    4. To arrange return carriage at the customer’s expense and to notify the owner of return time, date and carrier. Equipment must be packed in accordance with our rental return packing instructions.
  4. Any repairs necessary to return the equipment to the manufacturer’s specification on completion of hire shall be chargeable to the customer. Any parts used will be charged at full replacement cost.
  5. The owner shall not be liable for any claim by the customer for any consequential loss, damage or injury (including death) caused by default of the equipment or for delivery.
  6. Deliveries will be provided by a transit carrier but delivery dates and times when quoted are without engagement. These terms and conditions are supplementary to and not in place of Arobase Limited’s standard conditions of sale, copies of which are available on request.
  7. All rentals are subject to availability on a first come, first serve basis.
  8. We reserve the right to alter instrument specifications and kit configurations without prior notice.




Nitrogen Purging Training

Nitrogen Purging Oil and Gas Installations

Have you ever heard someone say, “a complicated oil and gas installation is too difficult to purge using a flow technique and the simplest way to purge them is a straightforward pressure purge, where you treat it as one large vessel?”  

Nitrogen Purging Oil and Gas Installations

Have you ever heard someone say, “a complicated oil and gas installation is too difficult to purge using a flow technique and the simplest way to purge them is a straightforward pressure purge, where you treat it as one large vessel?”  

Or, “you need to let the nitrogen gas soak for a few hours?” Or even, “the gases can layer out and travel past one another, it’s known as stratification you know?” If so, please don’t  believe them!

And how about once the purge is completed, possibly the next day, you undertake some final tests only to find high concentrations of flammables still in the pipework. This time you reason, the flammable gases have either “magically come back, or the gas detector you’re using must be faulty!” Guess what, normally this isn’t true either.

And we will tell you why.

Nitrogen purging of gas installations is an often neglected part of gas detector training. Over the past few years we have been researching the most effective way of nitrogen and vacuum purging oil and gas installations and much of what we have learned is published in the various articles within this website. But, due to the practical nature of purging, @gt felt it was worth developing a series of classroom and site based courses designed to help engineers and gas testers understand how gases behave in both simple and complicated pipe configurations.

Each of the scenarios described above are explained and demonstrated during the course. Learners are then given a series of practical exercises to try for themselves and if needed, their problematic pipe configurations can be recreated and the most effective means of purging them explored.

Knowing how gases travel and the best way of removing them, results in less down time and much safer operating conditions. The courses use both classroom and practical sessions to test the knowledge of learners and demonstrate best practice in different scenarios. By following a simple 6 step process, @gt ensures learners leave not only with specialist purging skills, but ones they can also remember!

We are now in a position to offer courses ideal for:

  • Offshore production installations
  • Pipelines and vessels
  • Complex systems
  • Offshore and onshore compressor installations
  • Onshore pressure reduction stations
  • LNG installations etc.

We want your operators and gas testers to come and try the courses as we are confident many of you will save millions of dollars as a result. Imagine if you could cut your down time by days, simply by attending a few hours training. All who have tried it to-date say it really works.

If you would like to know more – simply contact us and ask.

Gas Survey Vehicles

Winter priority and trigger survey vehicles – Still needed?

Hello Gas Survey Vehicle Drivers

As the Cold Weather Hits – Do gas survey vehicles still play a role in preventing gas explosions?

As we move into a prolonged period of cold weather, gas survey vehicles will start to patrol our streets. Their purpose is to locate gas escapes caused by the effects of the elements. Gas transporters such as National Grid in the UK; use gas survey vehicles to proactively monitor leakage levels in the sensitive areas.

During specified periods, the vehicles patrol set routes using very sensitive gas detection equipment such to detect the presence of flammable gases.

Arobase are ready to service, maintain and calibrate survey vehicles to technical procedure T/SP/E22.

But there are other reasons why gas survey vehicles play an important role in the gas utility’s battle with leakage and public protection.

Watch this space for more information on this subject and in the meantime if you need assistance with sourcing and setting these devices up, feel free to contact us. Our team is waiting to help.

Gas Detection

How do I choose the right gas detectors?

The world’s gas detector marketplace is diverse and often complex. With its vast selection of instruments, manufacturers and suppliers all competing for your business, it is sometimes impossible to find the right solution. Our independent advice helps you make the right choices with the minimum of fuss. For example, how do you choose?

  • The manufacturer?
  • should you purchase or hire?
  • which sensors do I need?
  • are there interfering gases or vapours?
  • should I select a pumped or diffusive instrument?
  • when must my instruments be calibrated and bump tested?
  • What training do I need and where should I obtain it?
  • what operating procedure should I follow?

For answers, you could contact us or visit the free learning site arobase.org.uk.