The Fredericks Company’s Televac® vacuum measurement brand designs and manufactures passivevacuum gauges (also called a vacuum sensor or a vacuum transducer) including thermocouple gauges, convection gauges (also called Pirani gauges), and diaphragm gauges for low vacuum measurement along with cold cathode gauges (also called Penning ionization gauges) and hot ion gauges for high vacuum measurement.
Our ETI vacuum measurement brand offers various types of vacuum technology including glass and nude hot ion vacuum gauges (also called a hot filament, Bayard-Alpert, BA, or BAG vacuum gauge or vacuum sensor) for high-vacuum measurement from 10-10 Torr to 10-3 Torr using tungsten filaments. This vacuum technology is popular in the semiconductor industry for the higher accuracy it offers over cold cathode vacuum technology. While hot ion gauges provide better accuracy than cold cathode gauges, hot ion gauges are also more expensive, cannot be cleaned, and are more susceptible to contamination so they don’t last as long.
All Televac passive gauges require a vacuum controller or an active gauge in order to provide vacuum measurement for an end user. Vacuum controllers connect to our passive gauges with cables, whereas an active gauge electronics head plugs directly into a passive gauge.
If you’re interested in a rack or panel mounted vacuum controller, a good place to start is the MX200, or if you’re interested in a portable vacuum controller, check out the VacuGuard. If you want an active gauge, check out our MX4A (Pirani gauge) and MX7B (penning ionization gauge)!
Not sure which passive gauge to select? Here’s some additional information on our most popular passive vacuum gauges.
2A Thermocouple Pirani Vacuum Gauge
Our 2A thermocouple gauge (also often called a Pirani) is widely considered to be our most robust and contamination resistant low vacuum transducer due to the Pirani filament design and operating temperature, and it’s simple to install because it can be mounted in any orientation. The 2A thermocouple vacuum gauge’s primary limitation is that with all of our vacuum controllers, this thermocouple gauge will only read from 1*10-3 Torr (1 micron) to 20 Torr (20,000 microns), instead of all the way up to atmosphere (760 Torr). It also has slightly reduced accuracy over some parts of its operating range when compared to the 4A convection Pirani vacuum gauge.
4A Convection Pirani Vacuum Gauge
The 4A convection gauge (also often called a Pirani) is essentially an improved performance version of the 2A thermocouple vacuum transducer. It’s another very robust and contamination resistant low vacuum gauge option due to the Pirani design, but the 4A convection gauge must be installed in a vertical orientation in order to measure up to atmosphere (760 Torr). Its primary benefits over the 2A thermocouple Pirani gauge are that the 4A convection gauge has better accuracy (±10%) over its operating range, and that it can read from 1*10-3 Torr (1 micron) up to atmosphere (760 Torr).
7B Penning Ionization Gauge (Cold Cathode)
The 7B cold cathode vacuum gauge is a Penning ionization gauge which is known in the heat treat and vacuum furnace industry as the most robust and contamination resistant high vacuum gauge available on the market due to its mechanical design and operating voltage. This Penning ionization gauge has a vacuum measurement range from 10-7 Torr to 10-3 Torr and can be disassembled and cleaned many times by an end user to extend its life.
The 7B cold cathode vacuum gauge is typically paired with a 2A thermocouple vacuum gauge or a 4A convection vacuum gauge, which automatically turns on the 7B when it reaches 1*10-2 Torr. When paired with a 4A convection vacuum gauge you have a full range vacuum measurement solution from high vacuum (10-7 Torr) to atmosphere (760 Torr).
7FCS Cold Cathode Gauge Vacuum Transducer
The 7FCS cold cathode vacuum gauge is a double inverted magnetron gauge (as opposed to Penning ionization gauge technology) designed for UHV (ultra high vacuum; 10-11 Torr) vacuum measurements which is known in national labs for its quick start capability. Unlike other cold cathode gauges, it includes a filament which is turned on every time the cold cathode gauge turns on, allowing it to start and provide accurate readings at 10-8 Torr (or lower) within 5 seconds. This is particularly useful for national labs where power cycling can often occur while the system remains in high vacuum or UHV.
The 7FCS cold cathode vacuum gauge is typically paired with a 2A thermocouple Pirani gauge or a 4A convection Pirani gauge, which automatically turns on the 7FCS when it reaches 1*10-2 Torr. When paired with a 4A you have a full range vacuum measurement solution from high vacuum (10-11 Torr) to atmosphere (760 Torr).