Mastercool 55102-2400 — R744 CO2 High Pressure Gauge 70mm Oil Filled

Professional 70mm oil-filled high pressure gauge specifically designed for R744 (CO2) refrigeration systems. Dual scale display shows both psi and MPa measurements for accurate pressure monitoring in transcritical CO2 applications. Oil-filled design dampens needle vibration and protects internal components from harsh operating conditions typical of high-pressure CO2 systems.

Key Features:

• R744 CO2 Specific – Designed for transcritical CO2 refrigeration systems
• 70mm Gauge Face – Large, easy-to-read dial
• Oil-Filled Design – Dampens vibration, protects internals
• Dual Scale – psi and MPa measurements
• High Pressure – Optimised for HP side monitoring
• Professional Grade – Built to Mastercool standards
• Durable Construction – Withstands extreme CO2 system pressures

Specifications:

• Model: 55102-2400
• Type: High pressure gauge
• Refrigerant: R744 (CO2)
• Gauge Size: 70mm diameter
• Fill: Oil-filled
• Scale: psi and MPa
• Application: CO2 refrigeration systems
• Connection: 1/4" SAE (standard)
• SKU: 55102-2400
• Barcode: 700376116854
• HS Code: 90262080

R744 (CO2) High Pressure Applications:

R744 (carbon dioxide) systems operate at significantly higher pressures than traditional refrigerants, particularly on the high-pressure side where transcritical operation can exceed 1,400 psi (10 MPa). This high pressure gauge is specifically calibrated for the HP side of CO2 systems, providing accurate readings across the full operating range of transcritical CO2 refrigeration.

Oil-Filled Gauge Benefits:

• Vibration Dampening – Oil fill reduces needle flutter for accurate readings
• Component Protection – Protects internal mechanism from shock and vibration
• Extended Life – Reduces wear on internal components
• Harsh Environment – Withstands demanding commercial refrigeration conditions
• High Pressure Stability – Maintains accuracy under extreme CO2 pressures
• Consistent Performance – Maintains accuracy over time

Applications:

• Commercial CO2 refrigeration systems
• Transcritical CO2 installations
• Supermarket refrigeration
• Cold storage facilities
• CO2 cascade systems
• Natural refrigerant applications
• CO2 system commissioning and service
• High-pressure side monitoring

Complete R744 CO2 Gauge Set:

• 55102-1400 — R744 CO2 Low Pressure Gauge 70mm

R744 CO2 Manifolds:

• 55103-A — R744 CO2 2-Valve Piston Manifold 1/4" SAE
• 55661-A — R744 CO2 2-Valve Piston Manifold 3-150
• 55102-A — R744 CO2 2-Valve Piston Manifold Body Only

Why Use CO2-Specific High Pressure Gauges?

• Correct Pressure Range – Calibrated for extreme CO2 operating pressures
• Accurate Readings – Proper scale divisions for transcritical CO2 systems
• Safety – Designed to handle high CO2 pressures safely (up to 1,400+ psi)
• Professional Standards – Meet requirements for CO2 refrigeration service
• Dual Units – psi and MPa for international applications
• Transcritical Operation – Essential for monitoring supercritical CO2 conditions

Transcritical CO2 Systems:

In transcritical CO2 operation, the high-pressure side operates above the critical point of CO2 (1,070 psi / 7.38 MPa at 31°C). This requires specialised high-pressure gauges capable of accurately measuring pressures well above traditional refrigerant systems. The 55102-2400 is specifically designed for these demanding applications.

Installation:

Connect gauge to high pressure port on CO2 manifold using 1/4" SAE connection. Ensure connection is secure and leak-free – CO2 systems operate at very high pressures. The oil-filled design means the gauge should be mounted in an upright position for optimal performance. Avoid over-tightening connections which may damage threads.

Maintenance:

Inspect gauge regularly for damage or leaks. Check that needle returns to zero when not under pressure. If gauge becomes damaged or shows signs of oil leakage, replace immediately. Store in protective case when not in use to prevent damage to gauge face and connection threads. Never exceed the maximum pressure rating of the gauge.

Professional R744 CO2 high pressure gauge with 70mm oil-filled design. Dual psi/MPa scale for transcritical CO2 refrigeration systems. Built for extreme pressure commercial refrigeration service.