Modular concept for reliable process monitoring 

Polytec PAS spectrometers provide the ideal solution to your NIR process analytics problems. Diode array detector technology combined with a transmission grating design means the devices can be used for fast and reliable data acquisition. Flexible combinations with fiber-coupled components allow for integration in various measurement scenarios to suit the user’s requirements. Thanks to standardized components, no compromises need to be made with regard to precision and user-friendliness.

PAS spectrometers are available in a 19” plug-in housing with a 110 – 240 VAC power supply for installation in industrial cabinets. Small ½ 19” controllers with an actively stabilized (10 – 30 VDC) power supply are also available. They are particularly suitable for mobile applications on harvesters, for example.


Innovative transmission grating design

High measurement rates due to very short measuring times

Superior sensitivity and long-term stability

Uniformly high optical resolution across the entire spectral range

Extremely low scattered light levels

SMA 905 fiber-optic connector

Ethernet interface

  • Various scan heads, optical fibers and software modules

NIR spectrometers for industrial process control

Different models

PAS 1720/1721 and 1750
The compact diode array spectrometers (256 or 512 pixels) are equipped with TE cooling and cover a wavelength range of 850 nm to 1650 nm. They are either available in the 19” housing (PAS 1720) or in the ½ 19” housing.

PAS 2120/2121
These diode array spectrometers (256 pixels) also have TE cooling and can be used in a wavelength range of 1100 nm to 2100 nm. The PAS 2120 is integrated in the 19” housing, while the PAS 2121 is integrated in the ½ 19” housing.


Technical data

ModelWavelength rangeHousingDetectorResolution

PAS 1720

850 to 1650 nm19"256 Pixelfrom < 6.4 nm

PAS 1721

850 to 1650 nm½ 19“256 Pixelfrom < 6.4 nm

PAS 1750

850 to 1650 nm19"512 Pixelfrom < 3.2 nm

PAS 2120

1100 to 2100 nm19"256 Pixelfrom < 7.9 nm

PAS 2121

1100 to 2100 nm½ 19“256 Pixelfrom < 7.9 nm


Your PolyXpert in Process Analytics