MODEL 7917


Hot gas sampling up to 500 °C / 932 °F

The GRIMM 7917 Emission Sampling System (ESS) is designed to sample aerosol particles directly from hot exhaust gas, e.g. from fireplaces, combustion processes or engine exhausts. The sampling probe (Ø 8 mm) can be directly connected to stacks and features a two-stage dilution system with integrated filter, dryer and activated charcoal absorber. The dilution air of the first dilution stage is preheated, dried and free of particles and organic gases in order to avoid condensation. The second dilution is a cold dilution with particle free air. Both dilution stages are operated as closed loops with temperature stabilized critical nozzles for flow control of the dilution air. This allows very accurate, precise and stable dilution ratios. The ESS can be connected to a GRIMM SMPS+C or SMPS+E system for measuring continuous real-time particle size distributions.


  • sampling from hot gas with temperatures up to 500°C
  • heated sampling probe to prevent particle formation
  • stable and reproducible dilution ratios
  • optional with one or two dilution stages
  • integrated filter, dryer and activated charcoal absorber
  • compatible with GRIMM SMPS+C and SMPS+E systems


  • engine exhaust studies
  • characterisation of burners
  • monitoring emissions from domestic heating
  • measurements in stacks
  • optimization of burner chambers and combustion processes


sample gas temperature up to 500°C (932°F)

heater temperature

up to 200°C (392°F)

dilution air flow rates 9 L/min (first and second dilution stage)
dilution ratios @ 1 L/min sample flow
first stage:      1:10
second stage: 1:10 (total dilution ratio 1:100)

@ 0.3 L/min sample flow
first stage:      1:31
second stage: 1:31 (total dilution ratio 1:961)
flow control temperature controlled critical orifices

sampling probe diameter

8 mm (outer diameter)

absolute pressure range

800  - 1100 mbar

power supply

230 VAC 50-60 Hz

control unit dimensions (h x w x d)

21 x 25.5 x 26 cm (8.3 x 10 x 10.2 in)

control unit weight

9.4 kg (20.7 lbs)

dryer (length x diameter)

55 x 14 cm (21.7 x 5.5 in)

dryer weight

4 kg (8.8 lbs)

Your contact options