4A Convection Vacuum Gauge (Pirani)

Part Number: 2-2119-0XX and 2-2120-0XX

Our 4A convection gauge (also often called a Pirani or vacuum pressure gauge) is a fast, robust, contamination resistant, and high accuracy low vacuum pressure gauge due to the Pirani filament design. Note that by comparison to the 2A gauge, the 4A Pirani gauge must be mounted vertically.

The 4A convection gauge will read from 1*10-3 Torr (1 micron) to 1000 Torr (1,000,000 microns, slightly above atmosphere) as opposed to the more limited range of the 2A with our vacuum controllers. It also has improved accuracy over the 2A, with several of our active gauges and controllers offering ±10% accuracy over the full operating range of the vacuum gauge. The 4A vacuum pressure gauge can be operated by several Televac controllers, including the MX200, MM200, MC300, and MX4A.

Why would you choose the 4A convection vacuum gauge tube? An excellent question. Below is a list of some of the highlights of this vacuum transducer:

Televac 4A Convection Vacuum Gauge – Vacuum Pressure Gauge – Vacuum Sensor Features

  • Low cost Pirani vacuum pressure gauge
  • Compact, robust, contamination resistant vacuum transducer
  • Numerous fittings available (1/8″ NPT, NW25, NW40, CF40, among many others)
  • Drop-in vacuum pressure gauge replacement
  • Excellent customer support for vacuum transducers
  • Filters available for highly contaminated environments
4A ConvectionPart NumberPriceBuy
1/8” NPT Nickel-Plated Brass2-2119-001$115.00
NW16 (DN16 ISO-KF) Nickel-Plated Brass2-2119-016$150.00
NW25 (DN25 ISO-KF) Nickel-Plated Brass2-2119-025$155.00
1/8” NPT Stainless Steel2-2120-001$190.00
NW16 (DN16 ISO-KF) Stainless Steel2-2120-030$195.00
NW25 (DN25 ISO-KF) Stainless Steel2-2120-031$195.00
8-VCO Male Stainless Steel2-2120-040$200.00
8-VCO Female Stainless Steel2-2120-041$200.00
8-VCR Male Stainless Steel2-2120-042$200.00
8-VCR Female Stainless Steel2-2120-043$200.00
4-VCR Male Stainless Steel2-2120-044$200.00
4-VCR Female Stainless Steel2-2120-045$200.00
1.33” CF (DN16 ISO-CF-F) Stainless Steel2-2120-050$200.00
2.75” CF (DN40 ISO-CF-F) Stainless Steel2-2120-052$205.00
Vacuum Measurement Range1*10-3 (1 micron, 1 mTorr) to 1000 Torr
(for MX200, MM200, MC300, MP4AR)1*10-1 to 1*105 Pa
1*10-3 to 1000 mbar
Vacuum Measurement Range (MX4A)1*10-4 (1 micron, 1 mTorr) to 1000 Torr
1*10-2 to 1*105 Pa
1*10-4 to 1000 mbar
Accuracy1 to 10 mTorr (microns): ±1 mTorr (±1 microns)
(for MX4A, MX200)10 mTorr (microns) to 1000 Torr: ±10% of reading
Analog Output: ±5 mV
Accuracy1 to 10 mTorr (microns): ±1 mTorr (microns)
(for MM200, MC300, MP4AR)10 mTorr (microns) to 1 Torr: ±10% of reading
1 to 100 Torr: ±20% of reading
100 to 1000 Torr: ±10% of reading
Analog Output: ±10 mV
Maximum Filament Temperature250 °C
Mounting OrientationVertical
Calibration MediumDry air or nitrogen (N2)
Overpressure150 PSI
Operating Temperature0 °C to 50 °C
Storage Temperature-40 °C to 85 °C
Maximum Bakeout Temperature200 °C (stainless steel)
120 °C (nickel-plated brass)
Response TimeController dependent
Analog Output CharacteristicsController dependent
Analog Output ResolutionController dependent
Vacuum Fittings1/8″ NPT, NW16, NW25, 1.33″ CF, 2.75″ CF
See part numbers tab or datasheet for more
Electrical ConnectionsMale octal connector
Weight (NW25 Flange)150 g (0.33 lbs)
Height (NW25 Flange)76 mm (3.0″)
Height (NW25 Flange)31.7 mm (1.25″)
Additional DimensionsSee datasheet for dimensional drawings

Analog Output Characteristics

Televac vacuum gauge convection gauge pirani vacuum transducer
MX4A ConvectionMX200MX200 EthernetIPMC300
Measurement Range1*10-4 to 1000 Torr1*10-11 to 10,000 Torr1*10-11 to 10,000 Torr1*10-11 to 1000 Torr
Analog OutputConfigurable 0 to 10 V DC0 to 10 V DC (1 per sensor)0 to 10 V DC (1 per sensor)0 to 10 V DC (1 per sensor)
Programmable Set Points20, 4, or 80, 4, or 84
Heat treating and vacuum furnaces
Cryogenics and industrial gases
Thin film deposition and coating processes
E-beam welding
Pharmaceutical product processes
Plasma coating/sputtering
Cryogenic tanks/dewars
Refilling gas cylinders
Lighting/neon signs
Chemical processing
Pharmaceutical products
Processing vacuum packaging and transport