DTMS300 Monochromator

For those applications where the scattered light performance of a single monochromator is not sufficient, the excellent optical performance and flexibility of motorised slit of the TMS300 may still be experienced with two such sub-units used in tandem constituting thereby the DTMS300 double monochromator.

The DTMS300 maintains the flexibility of configuration and ability to cover a wide spectral range of the DTMc300, within a single scan, but includes the added advantage of internal motorised slits to permit the maintenance or selection of measurement bandwidth throughout the spectral range of use.

Compatible with the full range of sources, detectors and accessories of the Bentham portfolio, the DTMS300 monochromator is at the heart of many of our light measurement solutions, particularly those incorporating a UV component.

Key features include:


Configuration Pair symmetrical Czerny Turner monochromators
arranged for additive dispersion
Focal length Total focal length: 300mm
Individual Units: 150mm 
Grating mount Triple grating turret
Number of gratings 1-3
Grating size 68 x 84 mm
Aperture ratio f/4.1 (at all grating angles)
Number of entrance/ exit ports 1/2 or 2/1 on both monochromators
Mechanical resolution grating drive 0.000072°/ step
Slit type Fixed, micrometer or motorised variable

Slit Width & Height
10µm-10mm (W) x 20mm (H)
Order sorting 6/8-position filter wheel (includes shutter)
Filter Size 25mm diameter
OPTICAL PERFORMANCE (quoted for 1200g/mm gratings)
Spectral Range Within range 200nm-50µm
Linear Dispersion 1.35nm/mm
Wavelength accuracy ± 0.1nm
Wavelength reproducibility ± 0.025nm
Resolution full/ reduced slit height 0.15/ 0.05nm
Stray light rejection at 2.5 FWHM 10-8
Wavelength acquisition speed 2000 nm/s
Computer interface USB
Software Control BenWin+/SDK
Overall dimensions 624w x 375d x 255h
Optical height 168 mm
Weight 30 kg
Power supply Mains input 110/220V 50/60Hz
Diffraction gratings See separate Gratings page
Order sorting filters See separate Order Sorting Filters page
Filter wheel 252-8 (8-position filter wheel, includes shutter)


ADTMS300 configuration A

BDTMS300 configuration B

CDTMS300 configuration C

Dimensions - front view

Dimensions - top view