2A NASA Mini Thermocouple Vacuum Gauge Tube (Pirani)

Part Number: 2-2100-31

The Televac 2A NASA Mini is a smaller, more robust version of our 2A thermocouple vacuum gauge tube originally designed for NASA. Our 2A NASA Mini 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 NASA Mini is roughly half the size and volume of traditional thermocouple vacuum gauge tubes. This thermocouple vacuum gauge’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 VacuMini vacuum pressure gauge can be operated by several Televac controllers, including the MX200, MM200, MC300, B2A, Compact 2A, Vacuguard, and MV2A.

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

Televac 2A NASA Mini Thermocouple Vacuum Gauge Tube (Pirani) Features

  • Compact, robust, contamination resistant vacuum transducer
  • Standard Pirani 1/8″ NPT flange/fitting
  • Weather capped vacuum transducer with gasket and tether
  • Drop-in vacuum pressure gauge replacement
  • Excellent customer support for vacuum transducers
  • Convection gauge filters available for highly contaminated environments
2A NASA Mini SensorPart NumberPriceBuy
1/8” NPT Stainless Steel2-2100-31$619.50
NASA Mini VCR 4 male SST2-2100-97$672.00
Operating Range 1*10-3 Torr to 20 Torr
Analog Output Controller dependent
Supply Voltage Controller dependent
Maximum Voltage 5 V
Maximum Power 55 mW
Maximum Filament Temperature 250 °C
Mounting Orientation Any
Calibration Medium Dry air or nitrogen
Overpressure 125 psi
Analog Output Resolution Controller dependent
Operating Temperature -54 °C to 93 °C
Storage Temperature -54 °C to 93 °C
Bakeout Temperature 400 °C
Response Time ≤ 1 s
 
Accuracy
1 mTorr to 10 mTorr ±1 mTorr
10 mTorr to 100 mTorr ±10% of reading
100 Torr to 1 Torr ±20% of reading
1 Torr to 20 Torr Indication only
Analog Output ±10 mV

Analog Output Behavior

Televac thermocouple vacuum gauge vacuum transducer vacuum pressure gauge

2A VacuMini Thermocouple Sensor – The VacuMini is a commercial version of Televac’s 2A NASA sensor. This thermocouple sensor has a measurement range from 1 × 10-3 Torr up to 20 Torr. It indirectly measures absolute pressure by detecting the thermal dissipation of a filament. It includes a tethered cap that provides IP67 protection for the recessed electrical pins. It also has less than 25% of the internal volume of the Televac 2A vacuum sensor. The VacuMini can be operated by several Televac controllers, including the MM200, MC300, B2A, Compact 2A, Vacuguard, and MV2A.

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.

MM200 Vacuum Sensor Controller – The MM200 controls any Televac vacuum sensor including cold cathode, convection, diaphragm, hot ion, and thermocouple sensors. It also has optional features including up to 8 relay set points and RS-232/RS-485 communications. The large, bright LED display makes it easy to read from a distance. The MM200 is a modular unit, allowing customers to choose a vacuum sensing solution specific to their needs.

Space applications