Heated FPS

Heated dilution

The FPS-4000 is a versatile sampling system for controlled dilution of aerosols. When combustion aerosols are diluted, a common practise is to use two stage heated dilution to eliminate condensation and nucleation. In this setup the first stage dilution air is heated to match raw sample temperature to reduce the concentration of volatile compounds without risk of condensation. The second dilution stage operates in ambient temperature to further dilute the sample and to reduce the sample temperature to ambient level. All heaters are are connected and controlled via FPS program interface.

The dilution air heater (DH-1723/1711) is the same in all applications requiring heated dilution. The heater is used to heat the dilution air in the first stage between 20°C and 350°C, depending on the raw sample temperature.

A short probe heater (DH-1423/1411) is applied for automotive and small duct applications where duct or tailpipe sizes can range from 1 to 50 centimetres in diameter. The probe heater connects directly over the primary dilution stage.

A longer stack heater (FPS-4230/4110) is applied for stationary source and large duct applications. In addition, a mini-cyclone is included in the heater structure to remove large particles from the sample stream. The nominal cut-point of the mini-cyclone is 2.5 µm.

• Power consumption
  • 1000 W
• Max temperature
  • 500°C
• Material
  • AISI 316
• Connection
  • Tube connector for 10 mm pressurized air tube
  • Female Swagelok for 8 mm pipe

• Power consumption
  • 350 W
• Max temperature
  • 400 °C
• Material
  • AISI 316
• Connection
  • 2 x NW40 flange

• Power consumption
  • 350 W
• Max temperature
  • 400 °C
• Material
  • AISI 316
• Connection
  • NW40 flange, mini-cyclone isokinetic nozzles
• Mini-cyclone cutpoint
  • 2.5 µm nominal, flow correction available