For Solvent Based Processing

Model 21

Intrinsically Safe Positive Pressure-driven Sampler

With Pressure Reducing Regulator

For the Model 21 Series Sample Conditioning Package, continuous positive pressure in the process vessel or system provides the force that pushes the sample gas from the process to the sensor. Suitable for applications with process operating pressures between 5 and 300 psig, the Model 21 Series sampler includes a pressure reducing regulator to control the pressure and flow of the sample gas through the system.

To provide the sensor with a continuous clean sample gas flow, many solvent based processes require the removal of varying amounts of entrained vapors. Designed for process temperatures at or slightly above ambient, the integral Neutronics vapor condenser removes solvent and water vapors from the sample gas stream before they can contaminate the sensor. It consists of a heat exchanger powered by a vortex cooler. The vortex cooler provides the refrigeration for the condenser assembly, collecting heat from the sample flow and condensing entrained vapors. The vapor condenser is pneumatically powered. A vortex drive filter/ regulator is included in the sample package to regulate the drive gas to 30 psig.

Data sheet


  • Intrinsically Safe Design — With no moving parts, the pneumatically-powered Model 21 sampler is suitable for hazardous area locations
  • Corrosion Resistant NEMA 4X Enclosure — Suitable for indoor or outdoor use with protection against ingress of dust and water
  • 316L Pressure Reducing Regulator — Controls the pressure and flow of the sample gas for applications with operating pressures up to 300 psig
  • Integral Flow Switch — Opens contacts in alarm when sample gas flow falls below a preset level
  • Single or Dual Sensor Compatible — Option for redundant dual sensors enhances reliability
  • Internal Vapor Condenser — High efficiency vortex cooler with no moving parts removes contaminants from the sample gas stream
  • Low Maintenancece Package — High quality components with few replacement parts minimizes maintenance costs and unplanned downtime
  • Sample Gas Pressure: 5 to 300 psig
  • Sample Gas Flow: 5 slpm (± 1 slpm) total flow
  • Drive Gas: Instrument quality compressed air or nitrogen, 35 psig (minimum) @ 2 scfm (± 0.5 scfm)
  • Sample Filter: 90 micron sintered metal, 316 SS
  • Sampling Method: Positive pressure package with pressure reducing regulator, suitable for applications ranging from 5 to 300 psig
  • Vapor Conditioning: Air-cooled vortex-driven vapor condenser with continuous drainage
  • Wetted Materials: Stainless steel, glass, Teflon
  • Outside Dimensions: 23.62″(w) x 14.96″ (h) x 8.6″ (d) (600mm x 380mm x 211mm)
  • Weight: 50 lbs. (22.7 kg)