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 Range1*10-3 Torr to 20 Torr
Operating Range (MX2A)1*10-4 Torr to 1000 Torr
Analog OutputController dependent
Maximum Voltage5 V
Maximum Power55 mW
Maximum Filament Temperature250 °C
Mounting Orientation
1 × 10-3 Torr to 20 TorrAny
20 Torr to 1000 TorrVertical
Calibration MediumDry air or nitrogen
Overpressure150 psi
Analog Output ResolutionController dependent
Operating Temperature0 °C to 50 °C
Storage Temperature-40 °C to 85 °C
Maximum Bakeout Temperature120 °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 TorrIndication only
Accuracy (MX2A)
0.1 mTorr to 1 mTorr0.1 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
VacuGuard Portable Vacuum Controller
MX2A ThermocoupleMX200MC300VacuGuard™
Measurement Range1*10-4 to 1000 Torr1*10-11 to 10,000 Torr1*10-11 to 1000 Torr1*10-3 to 20 Torr
Analog OutputConfigurable 0 to 10 V DC0 to 10 V DC (1 per sensor)0 to 10 V DC (1 per sensor)None
Programmable Set Points20, 4, or 84None