2A Thermocouple Vacuum Gauge Tube (Pirani)

Part Number: 2-2100-10, 2-2100-0XX, and 2-2126-0XX

Our 2A thermocouple vacuum gauge tube (also often called a Pirani or vacuum pressure gauge) is widely considered our most robust and contamination resistant low vacuum pressure gauge 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 tube’s primary limitation is that with all of our vacuum controllers, this thermocouple vacuum transducer 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).

This vacuum gauge also has slightly reduced accuracy over some parts of its operating range when compared to the 4A convection Pirani vacuum gauge. The 2A vacuum pressure gauge can be operated by several Televac controllers, including the MX200, MM200, MC300, MX2A, B2A, Compact 2A, Vacuguard, and MV2A. With the MX2A, the full measurement range from 1*10-3 Torr (1 micron) to 1000 Torr (1,000,000 microns) is available.

Why would you choose the 2A thermocouple vacuum gauge tube? An excellent question. Below is a list of some of the highlights of this vacuum transducer:

Televac 2A Thermocouple Vacuum Gauge Tube (Pirani) Features

  • Low cost Pirani vacuum pressure gauge
  • Compact, robust, contamination resistant vacuum transducer
  • Numerous vacuum transducer fittings available (1/8″ NPT, NW25, NW40, CF40, among many others)
  • Drop-in vacuum pressure gauge replacement
  • Excellent customer support for vacuum transducers
  • Convection gauge filters available for highly contaminated environments
2A ThermocouplePart NumberPriceBuy
1/8” NPT Nickel-plated Brass2-2100-10$75.00
NW16 (DN16 ISO-KF) Nickel-plated Brass2-2100-016$100.00
NW25 (DN25 ISO-KF) Nickel-plated Brass2-2100-025$100.00
1/8” NPT Stainless Steel2-2126-001$190.00
NW16 (DN16 ISO-KF) Stainless Steel2-2126-030$195.00
NW25 (DN25 ISO-KF) Stainless Steel2-2126-031$195.00
8-VCO Male Stainless Steel2-2126-040$200.00
8-VCO Female Stainless Steel2-2126-041$200.00
8-VCR Male Stainless Steel2-2126-042$200.00
8-VCR Female Stainless Steel2-2126-043$200.00
4-VCR Male Stainless Steel2-2126-044$200.00
4-VCR Female Stainless Steel2-2126-045$200.00
1.33” CF (DN16 ISO-CF-F) Stainless Steel2-2126-050$200.00
2.75” CF (DN40 ISO-CF-F) Stainless Steel2-2126-052$205.00
Operating Range 1*10-3 Torr to 20 Torr
Operating Range (MX2A) 1*10-4 Torr to 1000 Torr
Analog Output Controller dependent
Maximum Voltage 5 V
Maximum Power 55 mW
Maximum Filament Temperature 250 °C
Mounting Orientation
1 × 10-3 Torr to 20 Torr Any
20 Torr to 1000 Torr Vertical
Calibration Medium Dry air or nitrogen
Overpressure 150 psi
Analog Output Resolution Controller dependent
Operating Temperature 0 °C to 50 °C
Storage Temperature -40 °C to 85 °C
Maximum Bakeout Temperature 120 °C (brass) 200 °C (stainless steel)
Response Time ≤1 s
1 mTorr to 10 mTorr ±1 mTorr
10 mTorr to 100 mTorr ±10% of reading
100 mTorr to 1 Torr ±20% of reading
1 Torr to 20 Torr Indication only
Accuracy (MX2A)
0.1 mTorr to 1 mTorr 0.1 mTorr resolution
1 mTorr to 10 mTorr ±1 mTorr
10 mTorr to 10 Torr ±10% of reading
10 to 100 Torr ±30% of reading
100 Torr to 1000 Torr ±10% of reading

Analog Output Behavior

Televac thermocouple vacuum gauge vacuum transducer vacuum pressure gauge

MX2A Active Thermocouple Gauge – This gauge utilizes an easily replaceable Televac 2A thermocouple vacuum sensor. It has a variety of features including a wide range of measurement from 1 × 10-4 Torr up to 1000 Torr, RS-485 communications, two programmable set points, and a selectable analog output. The bright OLED display makes it easy to read from a distance. Options can be set from four capacitive touch controls located on the top of the unit or through RS-485 communications. The extensive selection of fittings, simplicity of use, ease of sensor replacement, and competitive cost make this unit an excellent choice for a variety of vacuum applications.

4A Convection Sensor – The 4A convection sensor has a measurement range from 1 × 10-4 Torr up to 1000 Torr. The sensor features a rapid response time when compared to typical thermal sensors. It indirectly measures absolute pressure by detecting the thermal dissipation of a filament. The 4A can be operated by several Televac controllers, including the MM200, MC300, and MX4A.

MX200 Vacuum Controller – The Televac MX200 controls up to 10 Televac vacuum sensors including cold cathode, convection, diaphragm, and thermocouple sensors. It also includes RS-232/RS-485/USB with and up to 8 optional set point relays. The user interface includes six touch controls and a high contrast, 180° viewing angle green OLED screen, which displays the units of measurement and the set point status simultaneously. Multiple gas types are supported. The MX200 is a modular unit, allowing you to choose a vacuum sensing solution specific to your needs.