40mm Negative Pressure Gauge -0.1MPa Glycerin Filled

Product Introduction

The 40mm negative pressure gauge is designed for vacuum measurement applications requiring compact dimensions and reliable indication performance. Utilizing a Bourdon tube measuring mechanism, the gauge provides direct mechanical measurement without the need for an external power source.

Key Features

• Vacuum measuring range: -0.1 MPa to 0 MPa
• Equivalent pressure range: -1 Bar to 0 Bar
• Compact 40mm (1.5 inch) dial size
• Glycerin-filled vibration-resistant design
• Center back connection configuration
• Bourdon tube measuring mechanism
• Dual scale display available

Technical Specifications

Applications

• Vacuum pump monitoring systems
• Filtration and suction equipment
• Pneumatic control systems
• HVAC servicing and maintenance applications
• OEM industrial machinery
• General vacuum monitoring applications

Product Advantages

1. Stable Readings Under Vibration

The glycerin-filled construction helps dampen pointer movement caused by vibration and pulsating conditions, supporting clearer pressure indication. Liquid-filled gauges are commonly used in environments with high vibration levels. 

2. Compact Design for Limited Installation Space

The 40mm dial size allows installation in compact equipment and control panels where space is restricted.

3. Convenient Center Back Mounting

The center back connection design simplifies integration into equipment panels and enclosed systems.

4. Reliable Mechanical Measurement

The Bourdon tube mechanism provides direct vacuum indication without batteries or electrical components. Bourdon tubes remain one of the most widely used technologies for vacuum measurement. 

5. Suitable for General Industrial Vacuum Applications

Designed for non-corrosive gaseous media commonly encountered in vacuum pumps, pneumatic equipment and filtration systems.

Working Principle

When vacuum pressure is applied to the Bourdon tube, the sensing element deforms elastically relative to atmospheric pressure. The movement generated is transferred through an internal linkage mechanism, causing the pointer to rotate and indicate the corresponding vacuum value on the dial.

How to Select a Vacuum Gauge

• Determine the required vacuum measurement range.
• Select an appropriate dial size based on installation constraints.
• Verify thread specifications and mounting configurations.
• Choose liquid-filled designs for vibration-prone environments.
• Consider environmental protection requirements.

FAQ

What is a negative pressure gauge?

A negative pressure gauge measures pressure below atmospheric pressure and is commonly referred to as a vacuum gauge.

Why choose a glycerin-filled vacuum gauge?

Glycerin filling helps reduce pointer flutter caused by vibration, improving readability and helping protect internal components.

Can this gauge be used with vacuum pumps?

Yes. This type of gauge is widely used for vacuum pump monitoring applications.

Can this gauge measure positive pressure?

No. This model is designed specifically for vacuum measurement within a range of -0.1 MPa to 0 MPa.