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Model 275E Heated Sample Probe

Model 275E Heated Sample Probe
The Universal Analyzers Type 275E heated sample probe is designed for continuous use in extractive gas sampling systems.

The modular design is used to filter dust and particulate from high dust loaded, high temperature, and high dew point corrosive gas streams. The sample probe is designed with the end user in mind and comes with a no-tools design for filter replacement.

A stainless steel weatherproof cover is included along with integrated temperature control at 340°F. To avoid cold spots, high wattage heating and an insulation wrap is included to keep the filter element and the tube connections hot and above the dew point. A 9” length stainless steel filter (2μm) element comes standard.

For successful, continuous operation in high dust loading environments, it is important to install proper filtration and an efficient blow-back for periodic cleaning of the filter chamber, probe tube and optional probe tip filter. The type 275E extractive gas sampling probe is recommended for these applications and comes with a connection for blow back/purging and an air operated isolation valve. The isolation valve prevents over pressurizing the down stream components and assures that the total volume of blow back air entering the filter chamber is directed out the tube for efficient cleaning. To assure that the blow-back is effective, two high pressure accumulator tanks with air release valve are available.

Use of the isolation valve during a calibration sequence provides closed-loop plumbing option preventing excess use of expensive calibration gases.

Optional ANSI flanges, probe tubes and probe tip filters are available.


  • Easy filter element replacement
  • Blow Back with dual accumulator tanks
  • Hazardous area options
  • User-Friendly design
  • Self regulating temperature control
  • Prevents excessive use of cal gas
  • Ammonia Oxidizer optional
  • Pneumatic isolation valve
  • Corrosion resistant wetted parts
  • Rugged construction
  • Ease of maintenance
  • Stainless steel weather resistant enclosure
  • Sub flange for easy removal of probe tube/filter assembly


  • Cement Plants
  • Refineries
  • Incineration OPS
  • Other High Dust Applications

Technical Specifications

  • Filter Element: 2μm Stainless Steel – 9” length
  • Sample flow rate: 0-20 l/m
  • Operating Temperature: 375°F (optional 600°F)
  • Process Wetted Material: 316 Stainless Steel, PTFE, Viton, Ceramic
  • Sample Out Connection: 3/8” tube
  • Cal Gas Connection: 1/4” tube
  • Blow Back Connection: 1/4” tube (suggested air pressure 80-100psig)
  • Isolation Valve Connection: 1/4” tube (required control pressure 40 psig min; 120 psig max)
  • Heater Rod heaters: 500 watts
  • Temperature Control: Self-Regulating with thermo-switch & SSR
  • Area Classification: General Purpose
  • Power Supply: 115/230 50/60Hz VAC
  • Enclosure / Dimensions: SS ; 19 h x 17 w x 15 d
  • Weight: ~65 LB (29 KG)
  • Mounting Flange: ANSI 3” or 4” or other via optional flange adapter
  • Sample Line Connection: Via Heat Shrink boot
  • Probe Tube Options: Stainless Steel, Hastelloy, Mullite, Inconel or others on request