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Teledyne Hastings Gauge Tubes


Vacuum Gauges​​

Teledyne Hastings Instruments brings decades of experience to offer a full line of vacuum gauges, transducers, sensors and controllers to customers worldwide. Our products use a variety of pressure measurement technologies to provide a broad selection of equipment including thermocouple, piezo and pirani sensors. Additionally, Teledyne Hastings has a wide range of products and accessories that further enhance our product lines and simplify ease of installation. With the assistance of our experienced application engineers, global sales network and vacuum measurement expertise, we will help you find a reliable, repeatable and durable solution for applications in both laboratory and industrial environments. Your needs can be met by using quality vacuum gauges designed and manufactured by Teledyne Hastings.​

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​Rough ​Vacuum Products

  • DV-4 Series
    Uses a thermocouple sensor array to measure pressures between 0-20 Torr. The sensor sends a signal to one of our digital or analog vacuum gauges or controllers. The output signal corresponds to the pressure.
  • HVG-2020A
    A piezoresistive vacuum gauge that provides accurate pressure measurement throughout the rough vacuum region. (0.1 - 1000 Torr)​
  • HVG-2020B
    A wide-range, dual-sensor vacuum gauge that measures pressure accurately and confidently across seven decades. (0.1 mTorr - 1000 Torr)
Vacuum Gauge

​Medium Vacuum Products

  • DV-6 Series
    Our most popular vacuum gauge tube measuring 0 - 1000 mTorr. This sends a signal to one of our digital or analog vacuum gauges or controllers that corresponds to the pressure.
  • DV-5 Series
    A thermocouple vacuum gauge tube measuring 0-100 mTorr. This sends a signal to one of our digital or analog vacuum gauges or controllers that corresponds to the pressure.
  • HVG-2020B
    A wide-range, dual-sensor vacuum gauge that measures pressure accurately and confidently across seven decades. (0.1 mTorr - 1000 Torr).


​​There are numerous applications for our vacuum gauges, across a variety of industries. Teledyne Hastings has decades of experience with many of these applications – let us help you! Our application notes are provided to explain how our products improve your vacuum measurement and process control.​

Example: How to check vacuum in a HVAC system?

A common vacuum application that applies to our daily lives is the use of a Heating, Ventilation, and Air Conditioning (HVAC) or refrigeration system. The efficiency of these systems depends on how well it has been conditioned before the refrigerant charge. Before it can be charged, we must remove air and, more importantly, moisture. If there are any deposits of water clinging to the system’s internal surfaces, they will subsequently freeze and cause failure due to expansion and acid formation. 

To ensure ideal conditions we must check for vacuum in the HVAC system. This is done with an absolute vacuum gauge with high precision between 0.01 - 20 Torr; commonly a Thermocouple (TC) Gauge Tube.  By isolating the system from the vacuum pump, the system’s pressure will reach an equilibrium state where it can be measured to determine if there is moisture present. If the vacuum level reaches the vapor pressure of water, approximately 17 Torr, moisture is still present in the system and it must be cleared. If the pressure rises above 17 Torr, then there is likely a leak that needs to be addressed.

A more in depth explanation about the principles and process of measuring vacuum in a HVAC system is detailed in our HVAC System Application Note.

Suggested Equipment:

​Fre​quently Asked Questions

What are the benefits of a vacuum gauge?

The main benefit of a vacuum gauge is that it gives a clear indication of when then system has reached the desired vacuum levels so that the next process step can begin. The primary reason applications require vacuum is to create controlled environment. For example, in some instances you need to pull a vacuum to degas a system and remove impurities. Once you know that you are at an appropriate vacuum level then you can go ahead and proceed in a much cleaner process.

An additional benefit of using a vacuum gauge is the ability to identify system leaks by detecting elevated pressure. We can use these signs to narrow down what problems exist in the vacuum system and determine if they need to be replaced.

How does a vacuum gauge work?

Vacuum Gauges use either a direct or indirect method to determine the amount of gas molecules present in the measured area (or both as in the case with the HVG-2020B). The principle used to determine this measurement varies by the type of gauge. For example, a thermocouple gauge is a thermal conductivity gauge that indirectly measures gas molecules by using the heat transfer from the molecules and thermocouple wire to determine if vacuum is higher or lower. Whereas a direct gauge such as a piezo gauge measures pressure by directly interacting with the molecules.

Teledyne Hastings offers a Vacuum Gauge Glossary that explains the various vacuum gauges and their operating principles.

What’s the difference between a vacuum gauge and a pressure gauge?

A vacuum gauge is an absolute gauge that measures vacuum (negative pressure) with respect to absolute vacuum, i.e. a volume of space free of all gas molecules. A pressure gauge measures pressure with respect to the atmospheric pressure. 

What is a Pirani Gauge?

A Pirani vacuum gauge is a type of thermal conductivity gauge that is also often referred to as a “thermal heat transfer gauge”. In a Pirani gauge, the rate of heat transfer is a function of the number of gas molecules present in the vacuum system. Pirani gauges are capable of providing reliable pressure measurement in a wide variety of vacuum technology applications. We have a blog that explains more in depth at this link​.