4A Convection Vacuum Gauge (Pirani)

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, but 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 2A thermocouple vacuum gauge tube? An excellent question. Below is a list of some of the highlights of this vacuum transducer:

Televac 4A Convection Gauge (Pirani) 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
  • Vacuum pressure gauges designed and manufactured in the USA
Vacuum Measurement Range 1×10-3 (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
Accuracy 1 to 10 mTorr (microns): ±1 mTorr (±1 microns)
(for MX4A, MX200) 10 mTorr (microns) to 1000 Torr: ±10% of reading
Analog Output: ±5 mV
Accuracy 1 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 Temperature 250 °C
Mounting Orientation Vertical
Calibration Medium Dry air or nitrogen (N2)
Overpressure 150 PSI
Operating Temperature 0 °C to 50 °C
Storage Temperature -40 °C to 85 °C
Maximum Bakeout Temperature 200 °C (stainless steel)
120 °C (nickel-plated brass)
Response Time Controller dependent
Analog Output Characteristics Controller dependent
Analog Output Resolution Controller dependent
Vacuum Fittings 1/8″ NPT, NW16, NW25, 1.33″ CF, 2.75″ CF
See part numbers tab or datasheet for more
Electrical Connections Male 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 Dimensions See datasheet for dimensional drawings

Analog Output Characteristics

Televac vacuum gauge convection gauge pirani vacuum transducer
4A Convection Part Number
1/8” NPT Nickel-Plated Brass 2-2119-001
NW16 (DN16 ISO-KF) Nickel-Plated Brass 2-2119-016
NW25 (DN25 ISO-KF) Nickel-Plated Brass 2-2119-025
1/8” NPT Stainless Steel 2-2120-001
NW16 (DN16 ISO-KF) Stainless Steel 2-2120-030
NW25 (DN25 ISO-KF) Stainless Steel 2-2120-031
8-VCO Male Stainless Steel 2-2120-040
8-VCO Female Stainless Steel 2-2120-041
8-VCR Male Stainless Steel 2-2120-042
8-VCR Female Stainless Steel 2-2120-043
4-VCR Male Stainless Steel 2-2120-044
4-VCR Female Stainless Steel 2-2120-045
1.33” CF (DN16 ISO-CF-F) Stainless Steel 2-2120-050
2.75” CF (DN40 ISO-CF-F) Stainless Steel 2-2120-052
Heat treating and vacuum furnaces
Cryogenics and industrial gases
Thin film deposition and coating processes
Semiconductor
E-beam welding
Petrochemical
Load-lock
Pharmaceutical product processes
Plasma coating/sputtering
Cryogenic tanks/dewars
Refilling gas cylinders
Lighting/neon signs
Chemical processing
Textile
Pharmaceutical products
Processing vacuum packaging and transport