Mastercool 55900 IntellaSense II Refrigerant Leak Detector R134a R1234yf

The Mastercool 55900 IntellaSense II is a professional-grade refrigerant leak detector designed and certified to meet the highest industry standards. With design certification by Intertek to meet J2791 (R134a), J2913 (R1234yf), and EN 14624, this detector delivers superior sensitivity and reliability for detecting all refrigerants including CFCs, HCFCs, HFCs, and blends.

✓ Design certified by Intertek to meet J2791 (R134a), J2913 (R1234yf) and EN 14624

Advanced Metal Oxide Gas Sensor Technology

At the heart of the IntellaSense II is a new low-power metal oxide gas sensor with superior performance properties including lower current consumption and exceptional sensor longevity. The sensor is characterised by high sensitivity and fast response (less than 1 second) upon detecting extremely small levels of chlorofluorocarbon gases, making it ideal for locating even the smallest leaks in modern A/C systems.

Intelligent Microprocessor Control

A powerful integrated microprocessor automatically selects the best operating condition for the sensor to ensure optimum performance throughout the 2000-hour sensor life. This intelligent design eliminates guesswork and delivers consistent, reliable results.

Key Features

• Super Sensitive Function — Further sensitising beyond standard settings for locating small leaks with gases such as R1234yf and R407C
• Three sensitivity levels — HIGH ≥ 0.15 oz/yr (4 g/yr), MEDIUM ≥ 0.25 oz/yr (7 g/yr), LOW ≥ 0.50 oz/yr (14 g/yr)
• Intelligent probe tip design — Senses environmental conditions to eliminate false alarms
• Flexible 15.5" probe — Reaches difficult locations with ease
• Six vertical LED display — Red, yellow, or green LEDs display relative signal level, sensitivity range, and diagnostic information
• Fast response time — Less than 1 second detection
• Detects all refrigerants — CFCs, HCFCs, HFCs, and blends including R134a, R1234yf, R407C, R410A, R22, and more
• Long sensor life — 2000 hours of operation
• Extended battery life — 30 hours on 2 C alkaline batteries (6000 mAh)
• Wide operating temperature — 0 to 60°C (32 to 140°F)
• Lightweight design — Only 0.49kg (1.08 lbs) for comfortable all-day use
• Complete kit — Packaged in blow-moulded case with 2 C batteries, leak test vial, and replacement parts

Six LED Display Functions

The intuitive LED display provides clear visual feedback:

• Relative signal level — Shows leak concentration strength
• Sensitivity range indicator — Displays selected LOW/MEDIUM/HIGH setting
• Diagnostic information — Low battery, interference/wait, contaminated atmosphere, readiness, or fault conditions

Keypad Functions

• ON/OFF — Power control
• VOLUME/MUTE — Adjustable audio feedback or silent operation
• H M L SENSITIVITY — Select desired sensitivity level (High/Medium/Low)
• PEAK/HR/LR — Dual purpose: (1) Locate largest leak in systems with multiple leaks, (2) Switch between HR (high range) and LR (low range) modes

Technical Specifications

• Certification: Intertek certified to J2791 (R134a), J2913 (R1234yf), EN 14624
• Sensing element: Heated tin oxide (low-power metal oxide gas sensor)
• Sensitivity levels: HIGH ≥ 4 g/yr (0.15 oz/yr), MEDIUM ≥ 7 g/yr (0.25 oz/yr), LOW ≥ 14 g/yr (0.50 oz/yr)
• Response time: <1 second
• Probe length: 15.5" (39.4cm) flexible
• Sensor life: 2000 hours
• Refrigerants detected: All CFCs, HCFCs, HFCs, and blends
• Operating temperature: 0-60°C (32-140°F)
• Power: 2 x C alkaline batteries (6000 mAh)
• Battery life: 30 hours
• Weight: 0.49kg (1.08 lbs)
• Display: 6 vertical LEDs (red, yellow, green)

Complete Kit Includes

• IntellaSense II leak detector
• Blow-moulded protective case
• 2 x C alkaline batteries (6000 mAh)
• Leak test vial for calibration verification
• Replacement parts

Why Choose the IntellaSense II?

The 55900 is essential for professional HVAC/R technicians working with modern refrigerants. The Super Sensitive Function is specifically designed for R1234yf systems where even tiny leaks can be costly due to high refrigerant prices. The intelligent probe tip eliminates false alarms from environmental contamination, saving time and improving diagnostic accuracy.

Compatible with All Commander Machines

The IntellaSense II is the recommended leak detector for use with all Arctic Commander 2.0 R/R/R machines:

• COMMANDER1100 — Semi-automatic R134a
• COMMANDER2100 — Fully automatic R134a
• COMMANDER3100 — Automatic R134a & hybrid
• COMMANDER4100 — Automatic R1234yf & hybrid

View our complete range of leak detection tools for professional HVAC/R diagnostics.

Professional refrigerant leak detector certified to J2791, J2913, and EN 14624. Detects all refrigerants with <1 second response, three sensitivity levels, intelligent probe, and 2000-hour sensor life. Complete kit with case and accessories.