The refrigeration pressure gaugeis used to measure the current pressure of the refrigeration system, which is mainly used to detect the different stages of the system's refrigerant pressure, to help users master the operation of the equipment.

What Is a Refrigeration Pressure Gauge?

A refrigeration pressure gauge is a specialized pressure measuring instrument used in refrigeration and HVAC systems to monitor refrigerant pressure during operation.

It helps technicians and engineers:

• Check refrigerant pressure

• Diagnose system problems

• Control refrigerant charging

• Maintain refrigeration efficiency

A refrigeration pressure gauge is widely used in:

• Air conditioning systems

• Refrigeration equipment

• Chillers

• Heat pumps

• HVAC maintenance systems

A reliable refrigeration pressure gauge should provide:

• Accurate pressure measurement

• Clear pressure reading

• Stable performance

• Long service life

Refrigerating pressure gauges are generally divided into high-pressure gauges and low-pressure gauges, that is: general low-pressure gauges' highest reading value is 1.8 mpa or 18 bar, high pressure gauges highest reading value is 3.8 mpa or 38 bar.

Types of Refrigeration Pressure Gauge

1. Low Pressure Refrigeration Gauge

Low-pressure gauges are mainly used to measure suction pressure.

Typical applications:

• Evaporator pressure monitoring

• Refrigeration system diagnosis

• Cooling system maintenance

Common pressure range:

• Up to 1.8 MPa

• 18 bar

2. High Pressure Refrigeration Gauge

High-pressure gauges measure discharge pressure after compression.

Applications:

• Compressor outlet monitoring

• Condenser pressure measurement

Common pressure range:

• Up to 3.8 MPa

• 38 bar

3. Dual Pressure Refrigeration Gauge

Dual gauges combine:

• Low-pressure gauge

• High-pressure gauge

Advantages:

• Complete system pressure monitoring

• Faster troubleshooting

• Widely used by HVAC technicians

How Does a Refrigeration Pressure Gauge Work?

A refrigeration pressure gauge works by measuring the pressure of refrigerant inside the refrigeration system.

The basic working process includes:

1. Refrigerant enters the gauge through the connection port.

2. The internal sensing element detects pressure changes.

3. The Bourdon tube deforms according to the pressure.

4. The mechanical movement transfers the pressure change into pointer movement.

5. The dial displays the pressure value and corresponding temperature scale.

Most mechanical refrigeration pressure gauges use a Bourdon tube structure because of its accuracy and durability.

How to read the Refrigeration pressure gauge?

1. The value of the outer ring of the low-pressure gauge is the value of MPA. If the pointer reaches“3”, the current pressure is 0.3 MPa. The value of the second ring of the low-pressure gauge from the outer ring to the inner ring is 1KG/CM2.

2. The value of the bar in the inner red circle of the high-pressure gauge is the value of bar if the pointer points to“20”, that is, the current pressure is 20 bar.

Conversion of different pressure units

1MPa≈101kg/cm2≈10bar≈145Psi

How does the Refrigeration pressure gauge read the temperature?

1. Low-pressure meter, from outside to inside number.

The second circle of Blue R407C temperature value, unit ° C degrees Celsius. Lap 4 black R22 temperature value, unit ° C (Celsius)

If a chiller refrigerant use R22, the operation of low pressure 0.5 mpa corresponding condensation temperature of about 6 degrees.

If a chiller refrigerant use R134a, the operation of low pressure 0.3 mpa corresponding condensation temperature of about 9 degrees.

2. High-pressure meter, from inside to outside number.

Lap 1, black, pressure value, in MPA (MPa) or bar.

Lap 2, black, R404A temperature, unit ° C (Celsius).

Lap 3, blue, R134A temperature, unit ° C (Celsius).

Lap 4, green, R22 temperature value, unit ° C (Celsius).

If a chiller uses R22 refrigerant, operating high pressure of 1.8 mpa corresponding condensation temperature of about 50 degrees.

If a chiller uses R134a refrigerant, operating high-pressure pressure 1.4 mpa corresponding condensation temperature of about 55 degrees.

The above is about the Refrigeration pressure gauge, hope to help you better understand our products, if you have other questions or needs, you can contact us directly.