Vacuum and Compound Gauges

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Brief Description

Vacuum and Compound Gauges are indispensable tools designed to measure pressure either below atmospheric pressure (vacuum) or a combination of both vacuum and positive pressure (compound).

In-depth Overview

These gauges typically employ a highly calibrated C-shaped Bourdon tube element. A vacuum measurement indicates pressure relative to absolute zero pressure, usually displayed in units like inHg (inches of mercury) or mbar. Compound gauges are versatile, featuring a scale that starts in the vacuum range (left side) and continues into the positive pressure range (right side), simplifying monitoring for processes that cycle between suction and discharge, such as vacuum pump lines and solvent recovery systems.

Specification

Parameter	Details
Pressure Type	Vacuum (Full Vacuum), Compound, or Low Vacuum
Measuring Element	Copper Alloy or Stainless Steel Bourdon Tube
Vacuum Range	−1 to 0 bar (−30 inHg to 0 psi)
Compound Range	−1 bar to 2.5 bar (or higher positive range)
Nominal Size	63mm, 100mm, 150mm
Connection Type	Bottom or Back Connection (NPT/BSP)
Case Filling	Dry or Glycerin Filled (for vibration damping)
Unit Options	bar, kPa, inHg, mmHg, psi

Applications

HVAC and Refrigeration: Monitoring vacuum levels during system evacuation to ensure all moisture and air are removed.
Vacuum Pumping Systems: Direct monitoring of the pump's performance and system integrity.
Chemical Mixing and Evaporation: Processes operating under controlled, slight vacuum or pressure variations.
Automotive Engine Testing: Gauging intake manifold pressure (vacuum) for diagnostics.

Key Advantages

Versatility (Compound): Measures both positive and negative pressure with a single instrument, saving space and cost.
Cost-Effective: Mechanical gauge offers a reliable local indication without the complexity of electronic transmitters.
Media Compatibility: Available in stainless steel for aggressive media (vapors/liquids) in the vacuum range.
Clear Indication: Color-coded scales (often red for vacuum, black for positive) enhance reading clarity.

Payment and Shipping

We offer standard payment via T/T and support various Incoterms (FOB, CIF, EXW). Vacuum gauges are typically stocked items and can be dispatched swiftly, usually within 5-7 working days. We ensure all oil-filled models are securely sealed and the dial windows are protected with cushioned inserts to prevent leakage or damage during international shipping.

Frequently Asked Questions

Q: What is the difference between gauge vacuum and absolute vacuum?
A: Gauge vacuum is pressure below the current atmospheric pressure. Absolute vacuum is pressure measured relative to a perfect vacuum (0 Pa), regardless of atmospheric pressure. Most Bourdon tube vacuum gauges measure gauge vacuum.

Q: Should I choose a dry or liquid-filled vacuum gauge?
A: Choose liquid-filled (Glycerin or Silicone) if the application has high vibration or severe pulsation, as the liquid dampens the movement for stable readings and longer life. Choose dry when temperatures are very high or when the gauge needs to be mounted in a non-vibrating panel.

Q: Can these gauges measure deep vacuum?
A: Standard Bourdon tube gauges are generally limited to rough vacuum (>1 mbar absolute). For deep or high vacuum (e.g., 10−3 mbar), specialized electronic vacuum transducers are required.

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Vacuum and Compound Gauges Manufacturers

Wuxi Huihua Special Instrumentation Co., Ltd. was established in December 2001, the registered capital is 5 million yuan, the existing staff of more than 50 small and medium-sized joint-stock enterprises.
The company specialises in the production of various types of special instruments, alternative to the localisation of imported instruments.To seismic pressure gauge, seismic electric contact pressure gauge, stainless steel pressure gauge, diaphragm corrosion-resistant pressure gauge, marine pressure gauge and other series as the main products. On the basis of field instruments, we have developed various kinds of pressure transmitters, pressure controllers, digital pressure gauges and so on. There are more than 30 series and 3000 specifications. Products are widely used in petroleum, chemical, paper, metallurgy, mining, chemical fibre, electric power, food, environmental protection, rubber and plastic, hydraulics and many other industries, and more than 2,000 domestic customers to establish a friendly relationship with the national large and medium-sized enterprises to establish a good partnership, won the majority of users praise, and set up a corporate brand image.