Mastercool 55900 Refrigerant Leak Detector Heated Tin Oxide Sensor, Certified J2791/J2913
- The Mastercool 55900 IntellaSense II is an electronic refrigerant leak detector using a heated tin oxide sensor, certified for R134a and R1234yf, with super sensitive mode and intuitive LED display. Includes leak test vial, replacement filters, flexible probe, and "C" batteries.
- Features:
- Heated tin oxide sensing element with "super-sensitive" function spotlights very small leaks such as those from R1234yf or R407C systems.
- Three sensitivity levels High (0.15 oz/year ? 4 g/year), Medium (0.25 oz/yr ? 7 g/year), Low (0.50 oz/yr ? 14 g/year) to tailor detection depending on leak size and environment.
- Flexible 15.5 inch probe with intelligent tip that senses environmental interference to reduce false alarms, enabling access to tight or hard-to-reach spots.
- Six vertical LEDs (red, yellow, green) provide real-time visual feedback: relative leak signal strength, sensitivity level, battery status, and warnings.
- Includes:
- IntellaSense II leak detector unit (55900)
- Leak test vial for detection confirmation
- Replacement filters (three)
- Two "C"-size alkaline batteries included
- Blow-molded carrying case for storage/transport
- Specifications:
- Manufacturer: Mastercool
- Part Number: 55900
- Sensing Element: Heated tin oxide gas sensor (metal oxide)
- Sensor Life: 2000 hours
- Refrigerant Compatibility: All refrigerants including CFCs, HCFCs, HFCs and blends; certified to standards J2791 (R134a), J2913 (R1234yf), EN 14624
- Sensitivity Levels: High: ~ 0.15 oz/year (~ 4 g/year); Medium: ~ 0.25 oz/year (~ 7 g/year); Low: ~ 0.50 oz/year (~ 14 g/year)
- Operating Temperature Range: 0 to 140 degreesF
- Response Time: Less than 1 second
- Power / Battery: Two "C" alkaline batteries (6000 mAh) included; approx. 30 hours continuous operating time.
- Probe Length: Flex 15.5 inch
- The Mastercool 55900 IntellaSense II can also be referred to as Mastercool Intellasense II electronic leak detector, Mastercool refrigerant leak detector 55900, super sensitive refrigerant leak sniffer, Mastercool heated sensor leak detector, and IntellaSense II all-refrigerants detector
Mastercool is a family-owned manufacturer of professional HVAC/R and automotive A/C service tools and equipment, including manifolds, gauges, vacuum pumps, recovery units, leak detectors, and fittings.
Q: What is the "super sensitive" mode used for?
A: It increases sensitivity beyond the standard settings so very small leaks (as low as about 0.15 oz/year) can be found, useful for fine seals or detecting halogen gas bleed in confined areas.
Q: Does it detect both R134a and R1234yf refrigerants?
A: Yes, it is certified to J2791 for R134a and J2913 for R1234yf, so it legally meets requirements for detecting those refrigerants.
Q: What are common causes of false alarms and how does this unit avoid them?
A: False alarms can occur from ambient refrigerant vapors, contamination, or interfering gases; this unit’s intelligent probe tip with environmental sensing delays or warns when environment is saturated or contaminated.
