Mastercool 55975 IntellaSense III Combustible Gas Leak Detector

Mastercool 55975 Combustible Gas Leak Detector

The Mastercool 55975 is a combustible gas leak detector using a heated tin oxide (metal oxide) sensing element to detect a wide range of combustible and halogen gases. It is designed for HVAC/R technicians, gas fitters, and service professionals who need to identify gas leaks quickly on the job. The 55975 features an intelligent probe tip with environment sensing to reduce false alarms, a six-LED display for signal level indication, and keypad controls for sensitivity and peak hold.

Important: Gas leak detection and any subsequent gas appliance work may require a licensed gas fitter or relevant trade qualification depending on your state or territory. Always follow the manufacturer's instructions and relevant safety guidelines. Confirm licensing and compliance requirements with the relevant authority before undertaking gas-related work.

Key Features

• Heated tin oxide (metal oxide) sensing element
• 2,000-hour sensor life
• Response time under 1 second
• Ultimate sensitivity: 50–1,000 ppm
• Intelligent 15" probe tip with environment sensing to reduce false alarms
• Six vertical LED display — shows signal level, sensitivity range, battery status, and fault conditions
• Keypad controls: On/Off, Volume/Mute, Sensitivity (High/Medium/Low), Peak hold
• Powered by 2 x C alkaline batteries (6,000 mAh)
• Operating temperature: 0°F to 120°F (-18°C to 49°C)
• Comes in a blow-moulded case with batteries, leak test vial, and replacement filters

Gases Detected

Acetone, Acetylene, Ammonia, Benzene, Butane, Butanol, Chlorine, Ethane, Ethanol, Gasoline, Hexane, Hydrogen, Hydrogen Sulfide, Isobutane, Methane (natural gas), Methanol, Methyl Acetate, Methyl Chloride, Methyl Ether, Naptha, N-Butane, Pentane, Propane, Propanol, Sulphur Dioxide, Trichloroethane.

Confirm suitability for your specific gas application before use.

What's Included

• Mastercool 55975 Combustible Gas Leak Detector
• 2 x C alkaline batteries (installed)
• Leak test vial
• Replacement filters
• Blow-moulded hard case
• Instruction manual (PDF)

Best For

• HVAC/R technicians checking for combustible gas leaks around appliances and pipework
• Gas appliance service and maintenance (confirm licensing requirements)
• Facilities teams and building maintenance professionals
• Applications requiring detection across a broad range of combustible gases

Check Before Ordering

• Confirm the 55975 is suitable for your specific gas application
• Gas appliance work may require a licensed gas fitter — confirm requirements in your state or territory
• Sensor life is 2,000 hours — factor in replacement cost for heavy use
• Warranty: 2 years from date of purchase; consumables excluded — confirm at time of purchase

Frequently Asked Questions

Does the 55975 detect refrigerants?

The 55975 is a combustible gas detector. It detects combustible and some halogen gases but is not designed as a dedicated refrigerant leak detector. For refrigerant-specific detection, see our refrigerant leak detector range.

How long does the sensor last?

The heated tin oxide sensor is rated for 2,000 hours of use.

Do I need a licence to use a gas leak detector?

Using a gas leak detector for detection purposes generally does not require a licence. However, any gas appliance repair or servicing identified as a result may require a licensed gas fitter. Confirm requirements with the relevant authority in your state or territory.

What is the warranty?

2 years from date of purchase. Consumables are excluded. Confirm current terms with HVAC Trade Supply at time of purchase.

Browse our full HVAC test and measurement range or contact our team for advice.