Ultrasonic Liquid Level Indicator

The Portalevel® MAX liquid level indicator for locating liquid levels in fire suppression cylinders, especially CO2, NOVEC 1230® & FM-200™

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Ultrasonic level indicator


The Portalevel® MAX is the fastest & easiest to use unit in the Portalevel Range. It is most popular with customers looking to test large numbers of cylinders and those using the equipment very regularly.

      • Quick and Easy Testing: The 8th Generation technology testing procedure is short and simple, making the process of inspecting cylinder content incredibly fast. Every cylinder can be inspected in under 30 seconds, with the ‘cal’ feature automatically setting up the unit for each cylinder at the touch of a button. This significantly reduces user error, makes the testing process very simple and requires minimal user training.
      • Powerful Testing: The Portalevel® MAX also has 4 different power modes (SPA). The SPA feature increases the sensitivity of the device and increases the strength of the output signal. As well as being an ideal unit for co2 bottle level measurement and to check the level of gas, the SPA feature enables the unit to continue working on very large tanks up to around 800KG of agent or containers experiencing high levels of corrosion and pitting.
      • Wide Range of Verifiable Agents: including but not limited to the common liquefied gaseous fire suppressant agents e.g. CO2 Bottle Level Measurement, Aluminium CO2, FM200/HFC-227EA, NOVEC 1230/FK-5-1-12, FE 25/FE 13, FE 36, Halon 1301/1211, CEA410, NAF S III, Refrigerants/R507

For those not using the equipment very regularly or those only testing smaller cylinders (below about 350KG / 700lbs) please see the Portalevel® Mini as another option!

Also, if you wish to store, download and export all readings plus convert any liquid level into agent weight, please see our Portasteele® Calculator


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What's in the box

Portalevel MAX Marine package

Portalevel MAX main unit   hard aluminium case protecting the controls, main electronics and power supply

Ultrasonic gel    Assists perfect contact between sensor & testing surface for maximum accuracy and ease of use.

Extension Rod (optional) Arm reaches easily between cylinders, allowing users to easily test multi-banked rows 2, 3 or 4 rows deep. 

Piezo electric sensor fitted with magnetic head to ensure perfect positioning on the cylinder 

Portatherm® IR thermometer  to quickly measure the ambient temprature of cylinders for level-to-weight conversion

Carrying case – Protecting the equipment during transport, storage and use

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

Select either the hand sensor or multi-banked extension rod depending on the application required. 

For older cylinders especially, ensure you have a light coating of either water or ultrasonic gel. This will help get signals into and out of the cylinders easily. 

For new and good condition cylinders the sensor can often be used without copulant. 

Using a CO2 cylinder as an example, place the sensor above the liquid level where you know there is gas and press ‘CAL’. This will set the unit up on the cylinder, taking account of wall thickness, material, cylinder dimensions, agent type and other variations. 

The bar graph will go to 100% indicating GAS.

Full bar graph indicates GAS

No bar graph indicats LIQUID 

Simply move the sensor down the cylinder wall until the bar graph disappears. This is your liquid level

Techical specifications


  • Height: 160mm
  • Width: 82mm
  • Depth: 30mm
  • Weight: 300g


+/- 1.5mm / 0.125inch



TX/RX sensor. 14mm diamater head. Magnetized sensor application connected by 1m BNC co-ax cable 

Power supply

1 x PP3 9V battery

10 hours operational battery life



Membrane controled LCD backlit display

dimensions 55 x 28mm

Operating temperature

-20C to +70c  /  68F to 158F

Classifications & Approvals

UL Listed 

RINA Classification Society Approval 

ABS Type Approval 

Power Supply

1 x PP3 9V Battery – 12hours continuous operation 

Operating Temperature

-10C to +65C / 67F to 160F


IP65 Rating 

CE UKAS ISO 9001 Registered

ISO 14001 




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


Download Portalevel MAX Brochure

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

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Frequently asked questions

What agents can the Portalevel MAX measure?

The Portalevel MAX can measure the level of a wide variety of liquids. The primary applicaiton is checking fire suppression cylinders for content or liquid level. These agents commonly include CO2, Clean Agent & Special Hazard fire suppression cylinders.

How accurate is the Portalevel MAX?

The Portalevel MAX can identify the liquid level to +/- 1.5mm and when used with the Portasteele Calculator, can calculate the agent weight to within 1%

What cylinders can the Portalevel MAX measure?

The Portalevel MAX is one of the most powerful and sophisticated units we have ever developed.

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