Mastercool 55102-1400 — R744 CO2 Low Pressure Gauge 70mm Oil Filled

Professional 70mm oil-filled low 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.

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
• Low Pressure – Optimised for LP side monitoring
• Professional Grade – Built to Mastercool standards
• Durable Construction – Withstands harsh CO2 system conditions

Specifications:

• Model: 55102-1400
• Type: Low 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: 55102-1400
• Barcode: 700376116847
• HS Code: 90262080

R744 (CO2) Refrigeration:

R744 (carbon dioxide) is increasingly used in commercial refrigeration as a natural, environmentally friendly refrigerant. CO2 systems operate at significantly higher pressures than traditional refrigerants, requiring specialised gauges designed to handle transcritical CO2 pressure ranges. This low pressure gauge is specifically calibrated for the LP side of CO2 systems.

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
• 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

Complete R744 CO2 Gauge Set:

• 55102-2400 — R744 CO2 High 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 Gauges?

• Correct Pressure Range – Calibrated for high CO2 operating pressures
• Accurate Readings – Proper scale divisions for CO2 systems
• Safety – Designed to handle transcritical CO2 pressures safely
• Professional Standards – Meet requirements for CO2 refrigeration service
• Dual Units – psi and MPa for international applications

Installation:

Connect gauge to low pressure port on CO2 manifold using 1/4" SAE connection. Ensure connection is secure and leak-free. 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.

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