TELEVAC 4A Convection

The TELEVAC 4A convection gauge provides reliable, fast response measurement from atmosphere to 10-3 Torr. Its high accuracy and repeatability help insure that processes start at the desired pressure time after time. The gauge has fast response time – in milliseconds rather than seconds as is the case with thermocouple-type gauges. The convection gauge measures absolute pressures by determining the heat loss from a fine wire filament maintained at a constant temperature.

The TELEVAC 4A Convection Features

  • Provides continuous and accurate vacuum indication
  • Cost-effective nickel-plated brass and rugged stainless steel construction with simple design for easy operation
  • Millisecond response time rather than seconds for thermocouple-type gauges
  • Cost-effective gauge tube for fundamental applications

Vacuum Measurement Range1 mTorr to 1000 Torr (Air/N2)
Accuracy+/- 1 mTorr at 1-10 mTorr

+/- 10% of reading at 10 mTorr to 1000 mTorr

+/- 20% of reading at 50 Torr to 120 Torr

+/- 10% of reading at 120 Torr to 1000 Torr

Response Time<500 ms from 10-5 Torr to atm
Operating Temperature15 °C to 50 °C
Bakeout Temperature250 °C (w/ 2 3⁄4 Conflat Flange)
Mounting PositionMust be mounted vertically
Mechanical Connection1/8 NPT, NW16, NW25, 2 3⁄4 CF and others
Electrical ConnectionOctal connector
Sensor MaterialNickel-plated brass and stainless steel
Overpressure Tolerance150 psig
DimensionsMax. Height 3.5” (for 1/8” NPT)

Max. Width 1.25” (for 1/8” NPT)

Analog Output Behavior

4A Convection Gauge Tube 1/8” NPT, Nickel-plated Brass2-2119-001
4A Convection Gauge Tube 1/8” NPT, Stainless Steel2-2120-001
4A Convection Gauge Tube, NW16 (DN16 ISO-KF), Stainless Steel2-2120-030
4A Convection Gauge Tube, NW25 (DN25 ISO-KF), Stainless Steel2-2120-031
4A Convection Gauge Tube, 8-VCO Male, Stainless Steel2-2120-040
4A Convection Gauge Tube, 8-VCO Female, Stainless Steel2-2120-041
4A Convection Gauge Tube, 8-VCR Male, Stainless Steel2-2120-042
4A Convection Gauge Tube, 8-VCR Female, Stainless Steel2-2120-043
4A Convection Gauge Tube, 4-VCR Male, Stainless Steel2-2120-044
4A Convection Gauge Tube, 4-VCR Female, Stainless Steel2-2120-045
4A Convection Gauge Tube, 1 1/3” Conflat Flange (DN16 ISO-CF-F), Stainless Steel2-2120-050
4A Convection Gauge Tube, 2 3⁄4” Conflat Flange (DN40 ISO-CF-F), Stainless Steel2-2120-052

Coating process
Plasma coating/sputtering
Cryogenic tanks/dewars
Heat treatment/vacuum furnace
Refilling gas cylinders
Load lock
Lighting/neon signs
Chemical processing
Electron beam welders
Pharmaceutical products
Processing vacuum packaging and transport