7th Generation Ultrasonic Level Indicator

The Portalevel Mini provides an ideal solution for testing typical fire suppression cylinders, providing a very versatile and reliable solution.  cylinders.

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Ultrasonic liquid level indicator


The Portalevel Mini provides an ideal solution for testing typical fire suppression cylinders. It utilises our trusted 7th generation technology, providing a very versatile and reliable solution. Over the years it has undergone numerous upgrade programs and the most popular unit in the range for testing standard size fire suppression cylinders.

The Portalevel Mini is most popular with fire servicing companies and asset owners managing their own fire suppression systems. This is because the Portalevel Mini provides a very quick, safe and efficient method for testing fire cylinder content. Traditionally, companies used to manually weight cylinders in order to measure cylinder content.

Weighing cylinders is an inherently flawed process for many reasons:

      1. It requires turning off the fire system, leaving the asset it is protecting exposed and at risk
      2. The system manifold is often damaged, resulting in extra cost and risk of permanent damage
      3. It is very dangerous with risk of accidental discharge causing asphyxiation with CO2 cylinders
      4. Moving heavy and cumbersome cylinders risks serious bodily damage
      5. Very inefficient, taking a lot of time, personnel and effort to complete testing

The Portalevel Mini overcomes all these issues.

      1. The fire system remains on, protecting the asset
      2. Cylinders do not need to be moved, with zero risk of damage
      3. Zero risk for accidental discharge caused by disconnected cylinders
      4. No need for any physical exertion
      5. One person can do equivalent tests in less than 10% of the time

The Portalevel Mini can test any fire cylinder (CO2, NOVEC 1230, FM200, Halon and many others) in under 60 seconds. Only one person is required to carry out testing, it can be done in a completely safe manner and can be used in conjunction with the Portasteele Calculator to complete level-to-weight calculations plus data storage and export.


      • For higher speed of testing, please see the Portalevel Max
      • For integrated level & weight calculations, please see the Portalevel Touch
      • For low cost, simple applications, please see the Portalevel Original
      • For more information on level to agent weight calculator, please see Portasteele

What's in the box

Portalevel Mini main unit containing the controls, display, power, connectors and fitted with eyelets for handsfree use

Pieze electric sensor fitted with magnetic head to ensure perfect positioning on the cylinder wall every time

Ultrasonic Gel ideal for rusted or poor condition cylinders. Ensures perfect connection between cylinder and sensor 

Carrying case ideal for protection, transportation and storage of the device 

Calibration certificate For traceability of accuracy and documenting unit setup. 

Operating instructions We can provide training and technical support via our Video Materials, over the phone or video call but the primary method is through our very clear, step-by-step operating manuals. 

How to use

Connect sensor with the BNC connector and turn on the device

Remove any debris such as dirt, peeling paint, or heavy dust. Apply spray of water or ultrasonic gel depending on cylinder condition. 

Using CO2 as an example, place the sensor above the liquid level, press & hold the ‘CAL’ button for 5 seconds. All the LEDs will light up. This indicates gas (above level)

Move sensor down the cylinder in small steps watching the LEDs. When all the LEDs have gone out, you have reached the liquid level.

Techical specifications


  • 200mm x 93mm x 45mm
  • 420g


+/- 1.5mm / 0.125 inches

Verifiable liquids / gases

CO2, FM-200™, NOVEC 1230®, FE-13, FE-25, Halon, halon substitutes and all other common liquid fire suppression agents 

Power supply

4 x AA 1.5V batteries

Approximately 10 hours battery life during normal operation 


On, Off, CAL and SPA 


Piezo electric ultrasonic crystal, with magnetic protective handheld applicator and 1m BNC coax cable 

Temperature range

-10C to +70C

Humidity range of 5% to 95%


  • Main unit – 3 Year Warranty 
  • Sensor –  1 Year Warranty 
  • Technical Support – Lifetime of the unit


Download Portalevel Mini Brochure

For basic product informatin, please find below. If you have any other questions, please contact us directly.

Frequently asked questions

What materials can the Portagauge 5 test?

The portable ultrasonic thickness gauge can test any type of metal and most hard plastics. The most popular metals include steel, aluminium, copper and popular plastics include PVC, Polyethene and fibreglass to name a few!

How accurate is the Portagauge 5?

The Portauage 5 is accurate at testing true material readings (ignoring surface coatings) to within 0.01mm

How to test sprinkler pipes?

The Portaguage 5 can be used to test any sprinkler pipe or other metal piping to identify areas of corrosion, locations where there has been considerable erosion, areas of fungal deterioration and other forms of metal ware. The testing process involves carrying out a series of spot checks along the bottom of the pipe. It is on the bottom of the pipe where liquid will naturally pool and thus where you are much more likely to have areas of heavy corrosion. The user simply goes down the entire length of the sprinkler pipe and continually monitors the pipe thickness and the waveform. Both should be consistent along the full length of the pipe. As soon as the thickness or the waveform begin to deviate significantly, (and they will normally do so together) the equipment has identified an area likely to be compromised and thus further physical & visual inspections will be required.

Do I need training to use the Portagauge 5?

This equipment is incredibly easy to operate, and no dedicated training is required in order to use the unit. We provide operating instructions which is normally enough to provide an operator with confidence and the required knowledge. However, every Coltraco unit comes with free technical support for the lifetime of the equipment so if you do need any further assistance, our technical team are on hand to support

How long does it take to deliver the portable thickness gauge?

These units are almost always available ex stock from the UK. Delivery to the UK is normally next day, Europe in 2 – 3 days and most of the rest of the world in 3 – 4 days from order. Please contact our sales team for an update on availability and for any other questions.

I don’t need to ignore the paint layer. Will this still work for my needs?

The short answer is yes and normally triple echo thickness gauge technology can be used for any thickness measuring applications. We do also offer our Portagauge 3 technology however which uses single echo technology and will measure paint & material as one reading.

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