Жидкостные и сухие манометры: как выбрать правильный манометр для промышленного применения

In the field of industrial measurement, selecting the right pressure gauge is crucial for equipment safety and production efficiency. Liquid-filled pressure gauges и сухие манометры are two mainstream technologies, each with unique advantages and suitable applications. This article provides an in-depth analysis of the differences between these two types of pressure gauges to help you make an informed decision.

What is a Liquid-Filled Pressure Gauge? Advantages and Applications

Liquid-filled pressure gauges (also known as liquid-filled gauges) are internally filled with media such as glycerin or silicone oil, providing superior protection for harsh industrial environments.

7 Core Advantages of Liquid-Filled Pressure Gauges

1. Excellent Vibration Damping – The fill fluid effectively absorbs mechanical vibration, ensuring stable pointer movement.
2. Pulsation Resistance – Smoothes pressure fluctuations for stable readings.
3. Full Environmental Protection – Prevents ingress of moisture, corrosive gases, and dust.
4. Wide Temperature Adaptability – Prevents fogging on the dial, suitable for environments from -20°C to 60°C.
5. Long-Term Lubrication – Reduces internal mechanical wear, extending service life by over 30%.
6. Anti-Condensation Properties – Ideal for workplaces with significant temperature and humidity changes.
7. Vibration Resistance Certification – Complies with ISO 17853 industrial vibration resistance standards.

Industries Suitable for Liquid-Filled Pressure Gauges

• Pressure monitoring in petrochemical equipment
• Hydraulic systems for mining machinery
• Marine and offshore engineering equipment
• Reciprocating compressor monitoring
• Industrial pump station pressure control
• Critical systems in power plants

What is a Dry Pressure Gauge? An Economical Industrial Pressure Gauge Solution

Dry pressure gauges feature a non-liquid-filled design, providing a cost-effective and reliable measurement solution for standard industrial environments.

5 Key Features of Dry Pressure Gauges

1. High Cost-Effectiveness – 20-40% lower procurement cost compared to liquid-filled types.
2. Wide-Angle Visibility – No liquid refraction, clear readings from up to a 160° viewing angle.
3. Lightweight Design – 25% lighter weight, easier installation.
4. Zero Leakage Risk – Eliminates the risk of media leakage and contamination.
5. Low Maintenance Requirements – Simple structure with low maintenance costs.

Recommended Applications for Dry Pressure Gauges

• HVAC systems
• General industrial pneumatic controls
• Indoor water pressure monitoring
• Laboratory test equipment
• Low-vibration production equipment
• Budget-sensitive standard applications

Liquid-Filled vs. Dry Pressure Gauges: 7 Key Selection Dimensions

1. Vibration Environment Adaptability

• High-vibration environments (>0.5g): Liquid-filled gauges are recommended.
• Low-vibration environments: Dry gauges may suffice.

2. Pressure Stability Requirements

• Pulsating pressure sources: Liquid-filled gauges are essential.
• Stable pressure sources: Either type can be used.

3. Environmental Harshness

• Corrosive, damp, or dusty conditions: Liquid-filled gauges are the best choice.
• Clean, dry indoor environments: Dry gauges are adequate.

4. Temperature Variation Range

• Environments with temperature differences >30°C: Choose liquid-filled gauges.
• Constant temperature environments: Dry gauges are suitable.

5. Budget Considerations

• Limited initial budget: Consider dry gauges.
• Focus on long-term total cost of ownership: Liquid-filled gauges are more economical.

6. Safety Level Requirements

• Critical safety applications: Prioritize liquid-filled gauges.
• General monitoring purposes: Choose based on specific needs.

7. Maintenance Capability

• Professional maintenance team: Both types are viable.
• Limited maintenance resources: Dry gauges are simpler.

Industrial Pressure Gauge Selection Guide: 5 Steps to Determine the Best Solution

Step 1: Environmental Assessment

Document vibration levels, temperature/humidity ranges, and presence of corrosive substances in the working environment.

Step 2: Application Analysis

Clarify pressure type (steady/pulsating), measurement range, and accuracy requirements.

Step 3: Cost Calculation

Compare initial procurement costs with the 3-5 year Total Cost of Ownership (TCO).

Step 4: Safety Evaluation

Determine the safety level of the application and the severity of failure consequences.

Step 5: Expert Consultation

Obtain professional selection advice from the supplier’s technical team.

Frequently Asked Questions: Liquid-Filled vs. Dry Pressure Gauges

Q1: Can liquid-filled pressure gauges be installed in any position?

A: Liquid-filled gauges are recommended to be installed vertically for optimal performance, with a tilt angle not exceeding 15°.

Q2: Can dry pressure gauges be used outdoors?

A: Not recommended. Dry gauges are sensitive to temperature and humidity changes. For outdoor use, choose liquid-filled gauges with an IP65 or higher protection rating.

Q3: Can the fill fluid in liquid-filled gauges leak?

A: High-quality liquid-filled gauges feature a triple-seal design with a leakage rate below 0.01% per year. Choosing reputable brands minimizes this risk.

Q4: What is the difference in calibration cycles between the two types?

A: Liquid-filled gauges typically have longer calibration intervals (12-24 months), while dry gauges are recommended for calibration every 6-12 months.

Q5: What accounts for the price difference?

A: The higher price of liquid-filled gauges is due to special fill media, enhanced sealing systems, vibration-resistant construction, and longer service life.

Professional Advice: Avoid These Common Selection Mistakes

1. Don’t decide based on price alone – In harsh environments, inexpensive dry gauges may need replacement within months.
2. Overlooking the installation environment – 50% of pressure gauge failures stem from insufficient consideration of environmental factors during selection.
3. Underestimating vibration impact – Even “slight” vibration can damage the internal mechanism of dry gauges over time.
4. Confusing application scenarios – Corrosion-resistant liquid-filled gauges are essential for chemical environments.
5. Skipping professional consultation – Free technical selection services can help avoid costly mistakes.

Conclusion: How to Choose the Most Suitable Industrial Pressure Gauge?

Both liquid-filled and dry pressure gauges are mature industrial measurement solutions. The key is to choose based on your specific application needs:

• Choose a liquid-filled pressure gauge when you require maximum reliability, longest service life, and the best resistance to harsh environments.
• Choose a dry pressure gauge when the application environment is mild, the budget is limited, and maintenance resources are simple.

As a professional pressure gauge supplier, we offer a full range of liquid-filled and dry pressure gauge solutions, covering the full measurement range from 0-100 MPa. Our technical team provides free selection consultation services to ensure you get the most suitable measurement solution for your application.

Get Professional Selection Advice Now: Visit our Product Center or contact a technical consultant for customized pressure gauge selection plans and technical support.