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8th Generation Portable Ultrasonic Liquid Level IndicatorP/N: 2290334-MAX-INDEx-stockSame-Day Dispatch*Request Quote*Order must be placed before 1pm UK office hours


Records PORTALEVEL® results by agent weight


Records PORTALEVEL® results by agent weight



The Portalevel® MAX INDUSTRIAL non-invasively verifies the contents of cylinders and tanks holding liquids, suitable for a range of industrial purposes e.g. food processing, pharmaceutical, aerospace manufacturing and transformers.

Three years warranty
Lifetime support
Calibration & trainingcertificates available1
Ultrasonic technology No radiation. Non-intrusive.
5 tried and tested applications
2 sensors for double the technology capability
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We greatly value the work we conduct on special applications as it allows us to deepen our expertise and broaden our knowledge. Through successive short feedback loops between practical operation and design we continue to develop and improve our technology. In addition, we enjoy working in industries outside of our core areas of Fire, Marine and Oil & Gas.


IBCs Food processing

Background: Food processing factory based in the south of the UK producing Coleslaw, packaged salads and pastas for the likes of McDonalds, Tesco, Morrisons, Lidl. Producing over 130,000 pots of Coleslaw a day.

Application: 2.2 metre high, 5mm stainless steel wall, filled with mayonnaise to be used for the Coleslaw. The current monitoring method consists of employing ladders to peer into the cylinder and check usage and remaining contents. The issue with this method lies in potential contamination and is a health and safety risk to the operator.

Solution: A site visit was conducted by Coltraco Engineers and after a short trial we were able to gauge that the existing liquid level indication technology employed on the Portalevel® Max would be efficient in quickly and accurately gauging the liquid level of mayonnaise within the vessel.

Implementation: The implementation of the Portalevel® Max allows the plant to run more efficiently and reduces risks by providing the staff with a means of accurately and non-invasively monitoring the contents within the mayonnaise tank negating the need for physical inspection using ladders posing a health and safety risk to the operator.

Possibilities: The trial and implementation suggested that we could develop a fixed monitoring system for this vessel and others like it, in order to non-invasively, continuously monitor the contents of mayonnaise (or any other condiments) within the tank. In addition we also saw possibilities to refine the capabilities of the Portalevel® Max to increase ease of use.

IBCs in pharma

Background: Background: A British pharmaceutical company, one of the largest in the world. We received a request from one of their pharmaceutical manufacturing plants in Ireland, the plant produces active ingredients that are used in drugs used to treat cancer, Parkinsons and Depression.

Application: We received a request to deliver a means to non-invasively monitor the contents within IBC’s (Intermediate Bulk Container). The ammonia is used to breakdown manufacturing by-products before they are then safely incinerated. An ammonia/water mix is delivered onto the site in IBC’s (Intermediate Bulk Containers). The current method of monitoring the contents within these IBC’s involved physical dip stick measurements on the tank to monitor usage and replacement. This methodology stemmed from a lack of confidence in the internal IBC monitoring system. However, the fumes given off by the ammonia creates a health risk for engineers. Opening the top valve also creates risk of contamination to the ammonia. They therefore require a non-invasive method.

Solution: A Coltraco Engineer visited the site to conduct technology suitability trials. We surveyed several of the IBCs (intermediate bulk containers) some were partially full and some were fully empty - after adjustments we determined general range for a full and empty state across 7 of the IBC’s.

Trial indicated real potential for us to deliver a solution for this application. Our present technology indicates that we have the capabilities to deliver a lasting solution to this challenge.

Implementation: Once we had proven that our current technology was suitable for the intended application, it was requested that the solution should be:

  • Non-Invasive and ultrasonic
  • Application Specific Calibration – 0=LIQUID 100+=AIR (unapparelled ease of use)
  • Intrinsically safe
  • Robust enough for daily use

Over the next 4 weeks we:

  • Developed a turn-key solution offering unparrelled accuracy, ease of use and clarity of indication on an Intrinsically Safe Platform specifically designed for an application in which a non-invasive solution didn’t previously exist. The Unit requires no input from the operator apart from the application of the sensor to the vessel wall. It is the easiest to use, and most accurate liquid level indicator in the world in spite of being intrinsically safe.

Result: The deliver of the solution allows the operators of the plant to safely, quickly and accurately monitor the contents within the ammonia vessels which are integral to the operation of the plant as a whole. The Unit will also reduce the amount of partially empty ammonia cylinders returned before emptying, saving the organisation money over time.

Ammonia cylinders in aerospace

Background: Manufacturer of high end components for Aerospace and other high end engineering. The Wolverhampton facility runs 24/7 365 days a year and is the size of around 2-3 football pitches. The facility is concerned mainly in manufacturing high end actuators that are installed on a range of civil and defense systems.

Application: The facilities manager of the factory met with us at the Facilities Management show in Birmingham weeks prior. We were informed on the need to monitor the contents within Ammonia Cylinders.

The customer uses ammonia in a nitriding process in which ammonia is applied to a heated metal infusing the metal with Nitrogen. This can have beneficial properties such as making the metal harder/tougher/higher melting temperatures etc. Presently, weighing techniques are used to ensure a cylinder has enough contents for a run. This has been shown to be ineffective and incur waste - a non-invasive, accurate method would be quicker, reduce waste and save money.

Solution: A Coltraco Engineer visited the site to conduct technology suitability trials. Our technology was found to be effective in accurately and quickly indentifying the liquid level within the ammonia cylinders.


  • It was recommended that a standard un-altered Portalevel® Max would be a suitable solution.
  • We also cooperated with the customer to develop an in-house testing and recording process that was compatible with their current processes.
  • The solution provided a quick and accurate non-invasive solution which allowed for more efficient operations and reduced waste by ensuring partially empty cylinders were not returned to the gas supplier.

Possibilities: The trial and implementation suggested that we could develop a fixed monitoring system for this agent to non-invasively constantly monitor their cylinder contents. This also stimulated interest in developing an Ammonia Portasteele® program to allow the accurate conversion of liquid level to agent mass.

Industrial transformers

Background: Transformers are used in electric power transmission and distributions and are devices that transfer electric power at different voltage levels. The main components within the transformers are the core and windings which are oil immersed. An oil conservator and Buchholz relay is also commonly found to monitor oil levels.

Application: As transformers age, they become more likely to lose internal oil. It is important for oil levels in the transformer main tanks to be full, as they act as an insulator and allows the transformers to function efficiently. High voltage transformer and switch gear units are also often designed to be submerged in oil which act as an insulator, making sure any technicians working on the units are not at risk of potentially fatal shocks. For transformers that are not fitted with an oil conservator or Buchholz relay, few means of oil level inspection exist and traditional methods include inspection by opening the lid of the transformer.

When the lid is opened, the insulating oil is exposed to the moisture in the atmosphere and will increase the rate of oil deterioration causing the life of insulating oil to shorten. This contributes to more frequent oil changes, significant downtime to the system when an oil change is conducted and the formation of sludge which reduces efficiency. A non-invasive oil monitoring liquid level indicator is necessary.

Solution: The Portalevel® MAX Transformer will be a safe, efficient and reliable solution to inspect oil levels in transformers non-invasively, typically in transformers that have no means of external oil indication. With the Portalevel® MAX Transformer, oil level inspection can be done routinely without opening the lid of the transformer and thus prevent unwanted moisture from being absorbed by the oil which deteriorates the oil.

Many companies around the world are beginning to use the Portalevel® MAX for checking the oil levels in Transformer & Switch Gear units. Since this equipment can non-invasively check the presence from the outside of the tanks, technicians can operate safely and with confidence.


Package includes


  • Dry Sensor

    A standard sensor for all land based Portalevel units. The metal applicator is connected to the unit via 1 meter of ax cable and a BNC connector.

  • Portatherm

    An infrared thermometer comes as standard. Designed with portability in-mind, this device is intended for monitoring cylinders in warm climates.

  • Main Unit

    The main unit is protected a IP65 Enclosure and weighs just 500 grams. It has a LCD Numeric Display with LED Bar Graph and 4 touch button controls.

  • Ultrasonic Gel

    Ultrasonic Gel is a brilliant agent for increasing the surface contact of the Sensor. Coltraco sensors have also been designed to work with water .

  • Special Applications sensor

    Special Applications Sensor with higher efficiency for more power output

How It Works

This is a video for a bespoke customised unit variation


Technical Specifications

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  • Height:160 mm (6.29 inches)
  • Width:82 mm (3.22 inches)
  • Depth:30 mm (1.18 inches)
  • Weight:300 grams (10.58 ounces)


Within 2% of true value (dependent on application)

Verifiable Agents

mayonnaise, ammonia, transformer oil.


  • 2 x sensors – one dry sensor with standard
  • one dry sensor for standard applications
  • one special applications sensor with higher efficiency for more power output

Power Supply

1 x PP3 9V battery (battery life 10 hours)


LCD back-lit display

Operating Temperature

-20°C to +70°C (68°F to 158°F)


Main Unit: 3 Years WarrantySensor: 1 Year WarrantyLifetime Customer Support

Package Contents

  • Main unit
  • 2 x Multi Application Sensor
  • Ultrasonic gel
  • Carrying case
  • Sensor set cables
  • Calibration certificate
  • Instruction manual
  • Portatherm
  1. Certificates of competence are issued at the discretion of Coltraco Technical Department.
  2. If a specific agent is not listed then please enquire with our technical support team
  3. Please note: for rugged applications on old or rough cylinders a dry sensor can be exchanged in the package.

Press Release

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