Grimm (1.108/1.109) Spectrometer with Nano-Check (1.320)

The 1.100-series spectrometers are lightweight, small, portable units measuring 24 x 12 x 6 cm and with a weight of approx. 1.7 kg + battery (0.7 kg); they are used for the continuous measurement of particles in the air (aerosols). The highest time resolution attainable with this unit is 1 s, making it a unique single particle counter in the world.

The result from the conductivity measurement combined with the unipolar diffusion charger, the current of the aerosol electrometer and a calibration factor enables this setup to reach a total number concentration range of 500 to > 10⁶ particles/cm³ and an average particle diameter range of 25 to 300nm.

The NanoCheck sensor consists of an aerosol Faraday cup electrometer combined with a unipolar corona charger and a time multiplexed electrode for conductivity measurement.

The result of the conductivity measurement combined with the diffusion charger, the current of the aerosol electrometer and a calibration factor enables this setup to reach a total number concentration range of 500 to > 10⁶ particles/cm³ and an average particle diameter range of 25 to 300nm.

As a consequence, the above compact system has a wide field of applications: particle count, determination of surface, volume and mass distribution within the range of 25 nm to 32 µm in more than 30 size channels; it can be employed for occupational health monitoring according to EN 481 as well, i.e. identification of inhalable, thoracic and alveolar mass fractions, down to nano particles.