A fire suppression system can remain unused for long periods, but its condition may still change. Liquefied agent can escape from a cylinder, pressure can fall in an inert gas system, sprinkler flow can be affected, and new gaps can reduce a protected room’s ability to retain extinguishing gas.
These problems are not always visible during a routine walkaround. Effective fire suppression system maintenance therefore depends on accurate measurement alongside visual inspection.
Coltraco Ultrasonics manufactures non-invasive testing and monitoring equipment for competent fire safety professionals. Its technology helps users verify cylinder contents, monitor inert gas pressure, measure sprinkler flow and identify leakage from rooms protected by gaseous suppression systems.
What Role Does Fire Suppression Testing Equipment Play?
Fire suppression testing equipment helps technicians measure conditions that cannot be confirmed by sight alone. Coltraco’s technologies support checks of liquefied cylinder contents, temperature-adjusted pressure in inert gas cylinders, liquid flow through sprinkler pipework and air leakage from protected enclosures.
These measurements form part of a wider fire suppression system inspection. They give qualified personnel useful information when assessing whether critical fire safety equipment remains ready for use.
What Should a Fire Suppression System Maintenance Checklist Cover?
A fire suppression system maintenance checklist should reflect the equipment installed, the extinguishing agent and the risks within the premises.
For checks supported by Coltraco technology, the maintenance plan should cover five areas:
- Verify the contents of cylinders holding liquefied extinguishing agents.
- Check pressure and temperature in non-liquefied inert gas cylinders.
- Measure flow through sprinkler, deluge or hydrant pipework.
- Identify leakage paths within gas-protected rooms and compartments.
- Record readings, equipment details and any required follow-up action.
The checklist should also state who may carry out each test and how often readings should be taken. Results become more useful when technicians can compare them with previous inspections and identify unexpected changes.
How Are Liquefied Fire Suppression Cylinders Checked?
Fire suppression systems containing CO2, FM-200™, NOVEC™ 1230, Halon and other liquefied agents depend on each cylinder holding the expected quantity.
A cylinder may appear undamaged even when slow leakage has reduced the amount of extinguishing agent inside. Pressure alone may not confirm the contents of a liquefied gas cylinder, so a separate level check may be required.
Traditional checks can involve disconnecting and weighing the cylinder. This requires physical handling and may temporarily disrupt the installed suppression system.
Using Ultrasonic Liquid Level Testing
Coltraco’s Portalevel® ultrasonic liquid level indicators locate the boundary between the liquid and gaseous phases from outside the cylinder.
The sensor sends an ultrasonic signal through the cylinder wall. The response helps the trained user determine where the liquid ends and the gas space begins without opening or dismantling the cylinder.
The Portalevel® ADVANCED provides a clear GAS or LIQUID indication and includes a signal viewer to support interpretation. Coltraco states that users can take a reading in under 30 seconds, making the instrument suitable for periodic checks across multiple cylinders.
This non-invasive method reduces the need to move heavy, pressurised fire suppression equipment solely to establish the liquid level.
Converting Liquid Level Into Agent Weight
Liquid level and agent weight are different measurements. Where records or maintenance procedures require the quantity to be expressed as weight, technicians must convert the detected level using information about the cylinder and extinguishing agent.
The Portasteele® CALCULATOR works with Portalevel® readings to calculate the estimated agent weight. The calculation considers cylinder dimensions, agent properties and temperature.
Recording the calculated weight gives fire safety personnel a clearer basis for comparing results between inspections.
A Typical Data Centre Application
Consider a data centre protected by a clean-agent suppression system with several cylinders positioned in a dedicated storage area.
Disconnecting and weighing each cylinder would require additional handling and could interrupt the installed arrangement. A trained technician can instead use an ultrasonic liquid level indicator to check each cylinder externally and record the results against its identification number.
Where closer oversight is required between service visits, the facility may also use fixed monitoring to identify changes in cylinder contents.
When Is Continuous Cylinder Monitoring Appropriate?
Periodic fire suppression testing provides a reading at a specific point in time. Some facilities need to know whether cylinder contents change between scheduled inspections.
The PermaMass® FEATHERWEIGHT is designed to monitor cylinder mass continuously. It can show changes associated with agent loss without waiting for the next handheld test.
The system can monitor multiple cylinders, report the quantity and percentage of agent loss and support connection to a fire control panel.
Continuous monitoring may be considered for:
- Data centres and communications facilities
- Power generation and critical infrastructure sites
- Marine and offshore installations
- High-value machinery and equipment rooms
- Sites with multiple or difficult-to-access cylinders
The choice between portable testing and continuous monitoring will depend on the level of risk, the number of cylinders and how quickly personnel need to know about a change.
How Are Inert Gas Suppression Systems Monitored?
Systems using non-liquefied gases such as Inergen®, nitrogen or argon need a different testing method.
An ultrasonic liquid level indicator cannot locate a phase boundary because the agent remains gaseous. Pressure can provide an indication of contents, but cylinder pressure also changes when the temperature rises or falls.
A different pressure gauge reading does not automatically confirm that gas has escaped.
Portagas® uses acoustic technology to assess pressure in pressurised, non-liquefied cylinders. It also measures cylinder temperature and compares the recorded pressure with the value expected at that temperature.
This helps personnel distinguish between normal temperature-related variation and a pressure change that may require further investigation.
Users can store results by site, cylinder, date and time before exporting the records in CSV or PDF format. This supports comparison between inspections and provides evidence that regular checks have been carried out.
How Does Testing Support Fire Sprinkler Systems?
Fire sprinkler systems, deluge systems and hydrants depend on water moving through pipework at the required rate.
Pressure gauges provide important information, but pressure is not the same as flow. Direct flow measurement can help technicians understand how much liquid is passing through the pipe under the test conditions.
Coltraco’s ultrasonic flow meters use sensors attached to the outside of the pipe. This clamp-on method avoids cutting into or penetrating the system.
Relevant technologies include:
- Portasonic® PLUS, which measures, records and exports liquid flow data
- Portasonic® PRO, which combines flow measurement with software-assisted pressure calculations
- Permaflow®, which provides fixed flow monitoring for ongoing applications
The Portasonic® ultrasonic flow meter range supports testing across sprinkler, deluge and hydrant systems without creating another opening in the pipework.
Competent personnel should compare the readings with the system design, previous results and the conditions under which the test was completed.
Why Does Room Integrity Matter?
A gaseous fire suppression system needs more than cylinders containing the correct agent. The protected room must retain the discharged gas for long enough to control the fire.
New cable routes, ventilation changes, door replacements and service penetrations can introduce leakage paths. Excessive air leakage may prevent the room from holding the required extinguishing concentration even when the suppression equipment itself remains fully functional.
The Fire Industry Association explains that enclosure integrity affects whether extinguishing gas can be retained for the required period. For maintenance teams, this means that confirming cylinder contents alone is not enough. The protected enclosure must also perform as intended.
Locating Individual Air Leakage Points
Coltraco’s Portascanner® AIRTIGHT has a different but complementary role. It uses ultrasound to locate and quantify individual air leakage sites without pressurising the room.
Technicians can use it before a door fan test to find likely leakage points, during remedial work to assess seals and penetrations, or after repairs to check whether identified gaps have been addressed.
Portascanner® AIRTIGHT does not replace a formal door fan test where one is required. It helps teams find where leakage is occurring so that repairs can be more targeted.
Where Does Coltraco Fit Within Wider Fire Safety Maintenance?
A full maintenance programme may cover fire alarms, detection devices, extinguishers, release controls, electrical components and other firefighting equipment.
Coltraco does not provide a complete fire suppression servicing contract. Its role is to supply specialist equipment for four measurement and monitoring tasks:
- Liquefied extinguishing-agent contents
- Inert gas cylinder pressure
- Sprinkler, deluge and hydrant flow
- Room and compartment leakage
A competent person or qualified service provider remains responsible for choosing the correct procedures, interpreting the results and assessing whether repairs or further work are needed.
The UK Government guidance for people with fire safety duties states that fire safety measures should be inspected, tested and maintained so that they remain in efficient working order and good repair.
How Often Should These Checks Be Carried Out?
There is no single inspection interval for every fire suppression system.
Testing frequency will vary according to:
- The agent, cylinder and suppression system type
- The facility being protected and its level of risk
- Previous readings or evidence of leakage
- Applicable regulations and industry guidance
- The manufacturer’s recommendations and maintenance plan
Additional testing may be appropriate after a discharge, cylinder replacement, unexplained pressure change, failed room integrity test or alteration to the protected enclosure.
The maintenance plan should identify which checks trained in-house personnel can perform and which tasks require a specialist fire safety technician.
Choose the Right Fire Suppression Testing Equipment
Reliable fire suppression system maintenance starts with knowing what needs to be measured.
Liquefied cylinders may require ultrasonic level detection and agent-weight calculations. Inert gas cylinders need pressure readings that account for temperature. Sprinkler and deluge systems require flow measurement, while gas-protected rooms need checks for individual leakage paths.
Coltraco Ultrasonics provides portable and fixed technologies for these tasks. Its equipment helps fire safety professionals gather useful measurements without opening cylinders, penetrating pipework or unnecessarily disrupting protected systems.
