Negative pressure vacuum gauge - pressure gauges for measuring negative pressure 

What is a glycerin vacuum gauge used for ? Glycerin vacuum gauges are instruments designed for measuring negative pressure. These devices are also called a vacuum gauge or a vacuum manometer. We offer both vacuum gauges and compound gauges in various designs and dial diameters depending on the required application. Our offer also includes standard pressure gauges for measuring pressure. 

Compound gauge what is it ? 

A compound gauge is a specialized measuring device that allows for the simultaneous reading of overpressure and negative pressure values relative to atmospheric pressure. It is used wherever pressure fluctuations may occur – both in industry and in car workshops, as well as hydraulic and pneumatic devices. Thanks to their sensitivity, compound gauges are ideal for precise measurements of even the smallest pressure changes, and some models are filled with glycerin to reduce the impact of vibrations on reading accuracy. Compound gauges are used in many industries, such as industry, agriculture, or automotive. They are used, among others, to control vacuum pumps in diesel engines, monitor pressure in intake systems, and also to test the operation of turbochargers and injectors. Vacuum gauge = pressure gauge for negative pressure

A wide selection of precise and robust vacuum gauges

For whom are glycerin vacuum gauges intended? These devices are used to measure pressure, which is why they are used by, among others, specialists involved in emptying various systems of working agents, e.g., air conditioning, heat pumps, or refrigeration. General-purpose pressure gauges allow for ensuring that there is a vacuum in a given system, which means it is leak-tight. This is necessary, among others, for performing many diagnostic, assembly, and service activities in air conditioning, refrigeration, or heating systems made of stainless steel. High precision of operation makes the results obtained with a vacuum gauge reliable, thus fully reflecting the actual state. Measurement accuracy goes hand in hand with intuitive operation, which simplifies and speeds up work. The use of the offered devices is useful for verifying system leak-tightness – the analysis results allow for excluding or confirming leaks as the cause of problems with the functioning of a given installation. A vacuum gauge is also referred to as a vacuum meter. 

Vacuum gauges and compound gauges: tools in pressure measurement

Vacuum gauges and compound gauges are essential instruments in many branches of industry, enabling precise measurement of pressure and negative pressure. Their application is key in technological processes, where control of these parameters determines the quality and safety of operations.

Glycerin vacuum gauge

Vacuum gauges, also known as vacuum meters, are used to measure negative pressure, which is pressure lower than atmospheric. They are commonly used in vacuum systems, such as: Food industry: vacuum packaging of products. Chemical industry: distillation and drying processes. Electronics industry: semiconductor production.

Compound gauges

Compound gauges are devices measuring both overpressure and negative pressure. They find application in systems where variable pressure conditions occur, for example: HVAC systems: monitoring pressure in air conditioning installations. Pharmaceutical industry: control of production processes requiring precise pressure maintenance.

Types of Vacuum Gauges and Compound Gauges

• By Material of Construction : Metal: characterized by high strength and corrosion resistance, suitable for industrial applications. Brass: lighter and cheaper, used where the highest precision is not required. Plastic: lightweight and corrosion-resistant, used in less demanding applications.
• By Connection Type. Bottom: connection located at the bottom of the housing, used in mounting on pipes and valves. Back: connection at the back of the housing, ideal for mounting on control panels.
• By Filling : Glycerin: filled with glycerin, which dampens vibrations and protects the measuring mechanism from damage. Recommended in environments with high vibrations. Dry: without filling, used in stable operating conditions.

Accuracy class of a vacuum gauge

Accuracy class defines the precision of the device's measurement. The lower the class value, the smaller the measurement error. Vacuum gauges and compound gauges are available in accuracy classes from 0.1 to 2.5, which allows for the selection of the appropriate instrument depending on the requirements of the application. Choosing the right vacuum gauge : When choosing a vacuum gauge or a compound gauge, the following should be considered: Measuring range: adapted to the maximum and minimum pressure values in the system. Operating environment: presence of vibrations, temperature, aggressiveness of the medium. Required accuracy: depending on the specifics of the technological process. Maintenance and calibration of vacuum gauges : Regular maintenance and calibration are key to maintaining measurement accuracy. It is recommended: Periodic checking: according to the manufacturer's recommendations. Calibration: in accredited metrological laboratories. Protection against mechanical damage: avoiding exposing devices to shocks and impacts.

What is negative pressure ?

Negative pressure is a state in which the pressure of a gas or liquid is lower than atmospheric pressure. In practice, this means that in a given system there is a pressure lower than the value of approximately 1013 hPa (i.e., standard atmospheric pressure at sea level). Negative pressure is often used in various branches of industry, especially in pneumatic, hydraulic, ventilation, and vacuum systems.

How to measure negative pressure ?

For the precise measurement of negative pressure, vacuum gauges are used, which are specialized manometers adapted to measure pressure below the atmospheric value. Vacuum gauges available at Hydron allow for accurate monitoring of conditions in systems where negative pressure control is key to the correct operation of the system. 

Vacuum gauge 

Precise measurement of negative pressure in hydraulic and pneumatic systems. A vacuum gauge is a measuring device used for the exact determination of the level of negative pressure (depression) in various types of technical systems. It finds application in hydraulics, pneumatics, technical services, laboratories, and the automotive industry. Thanks to high measurement precision and a resistant construction, the vacuum gauge is indispensable for diagnosing and maintaining systems where maintaining a stable operating pressure is essential. 

What is a vacuum gauge and what is it used for ?

A vacuum gauge, also called a vacuum meter, is a measuring instrument that indicates the negative pressure value relative to atmospheric pressure. In other words – it allows for determining how much lower the pressure in the system is than the surrounding air. This device is essential in many technological processes, especially where suction, extraction, evacuation of air or liquid occurs. Most commonly it is used for: controlling negative pressure in pneumatic and hydraulic systems, diagnosing braking and engine support systems, testing system leak-tightness, measuring pressure in vacuum and refrigeration installations, laboratory tests, and industrial processes.

Construction and operating principle of a vacuum gauge

Vacuum gauges available in the offer are precise devices with a solid construction, adapted to work in demanding industrial conditions. The basic model of a vacuum gauge consists of: housing (usually stainless steel or aluminum), dial with a legible scale, measuring mechanism (tube, spring, or electronic pressure sensor), threaded connection (usually G 1/4 or M12x1.5). The operating principle consists in measuring the difference between the pressure in the system and atmospheric pressure. The result is presented in bar, kPa, or mmHg units in the range of negative values (e.g., from 0 to -1 bar).

Types of vacuum gauges 

Depending on the application, various types of vacuum gauges are available:

1. Mechanical vacuum gauges

Traditional devices with an analog dial. They are characterized by reliability, simple operation, and shock resistance. Excellent for workshops, services, and industrial installations.

2. Electronic vacuum gauges

Modern instruments with a digital LCD display, ensuring high precision and fast reading of results. Ideal for laboratory applications, in industrial automation, and high-accuracy vacuum systems.

3. Vacuum gauges with a sensor

Equipped with an external negative pressure sensor that can be mounted in difficult-to-reach places. They enable remote measurement and real-time monitoring of values.

Application of vacuum gauges in hydraulics and industry

Thanks to its universality, the vacuum gauge finds application in many fields of technology: Power hydraulics – measurement of negative pressure in tanks, suction lines, and supply systems. Pneumatics – control of vacuum pump operation and suction systems. Automotive – diagnostics of brake assist and turbocharging systems. Refrigeration and air conditioning – testing system leak-tightness and vacuum levels in refrigeration systems. Laboratories and chemical industry – precise measurements in research and technological processes. In each of these applications, the vacuum gauge allows for increasing work safety, optimizing system performance, and preventing costly failures.

Negative pressure gauge

A negative pressure gauge, also known as a vacuum gauge, is a precise measuring device used everywhere where vacuum level control is necessary. A vacuum gauge is used to measure the negative pressure value in hydraulic, pneumatic, vacuum systems, and in technical installations where negative pressure values occur. A vacuum manometer allows for a quick assessment of whether the system is working properly, while a negative pressure meter is used both in services and in production plants, laboratories, and in machine diagnostics. Various models of vacuum gauges are available in the Hydron offer, adapted to demanding industrial applications. All products are distinguished by solid workmanship, measurement accuracy, and durability, which guarantees safe and failure-free operation of the devices.

Vacuum gauge vs manometer - the difference 

The basic difference between these instruments is related to the range of measured pressure. A glycerin vacuum gauge measures negative pressure, i.e., pressure values lower than atmospheric pressure. A manometer, on the other hand, shows pressure values higher than atmospheric, typical for hydraulic and pneumatic systems operating under positive pressure. In practice, the choice of the appropriate measuring instrument depends on the characteristics of the given system and whether it is important to monitor negative pressure or overpressure. Knowledge of these differences is key to ensuring the correct selection of measuring devices and obtaining reliable readings.

Vacuum gauge price and what affects it

The price of a vacuum gauge depends on several technical parameters that have a direct impact on the measurement accuracy and durability of the device. What the price of a vacuum gauge will be is influenced by, among others, the measuring range of the negative pressure, the dial diameter, the accuracy class, and the type of threaded connection. The execution of the housing and measuring elements is also of significant importance, especially in the case of industrial applications and power hydraulic installations. When choosing a vacuum gauge, it is worth paying attention not only to the price, but also to the adaptation of the device to the working conditions, as a properly selected vacuum gauge ensures stable and reliable measurement for a long time. When comparing vacuum gauge price will also depend on the category. It is also worth checking pressure gauges and compound gauges, which enable the control of various installation operating ranges. For the proper installation of vacuum gauges, the following are also helpful: pressure gauge adapters, ensuring a leak-tight and safe connection of the device.

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