SPECTRONIC 20D+ has been discontinued
The Thermo Scientific SPECTRONIC 20D+ spectrophotometer has been discontinued, however we continue to provide services and support for this product. The SPECTRONIC 20D+ is replaced by the Thermo Scientific SPECTRONIC 200 Spectrophotometer, which offers modernized and improved controls and features for analysis by visible spectrophotometry. The SPECTRONIC 200 features support for test tube cuvettes from 13 to 25mm diameter and for square or rectangular cuvettes from 10 to 100mm. The on-board software and full color graphics screen offer Quantitative Analysis with a manually entered factor or up to 4 standards.
ACCESSORIES FOR SPECTRONIC 20 AND 20D:
Square Cell Adapter
Adapts 333178 Test Tube Holder to take square cuvettes with 10 mm light path.
Test Tube Holder
As supplied with all models of the SPECTRONIC 20 and 20D spectrophotometers. Takes 1/2" diameter test tubes or 10-mm round cuvettes; ability to accommodate hatch COD vials.
Test Tube Adapter, 3/4"
For one 331781 Test Tube, 3/4" o.d. x 6" long; replaces standard holder in all SPECTRONIC 20 models. Requires use of 332932.
Test Tube Adapter, 1"
Similar to 332931, but for 331782 Test Tubes, 1" x 6". Without lightproofing cap on test tube.
Of brass, for use with 332931 and 332930 to cover tops of 6" test tubes. Inside diameter 35 mm, depth 64 mm.
Holium Oxide Filter
Used for calibrating any of the Spectronic spectrophotometers.
Absorption Cell, Cuvette
Square, of thin wall borosilicate glass. 11.66 mm light path length. Requires use of 333178 Holder to adapt small sample holder of current Milton Roy SPECTRONIC 20 spectrophotometer. Fits earlier style, standard holder regularly furnished with SPECTRONIC 20 models prior to October, 1958. Overall approximately 13 x 13 x 100 mm.
Ungraduated tubes are selected for uniformity and freedom from flaws in light path zone so that majority match within Â±1% of transmittance reading, but should be matched by the user for best results. Marking spot and reference line permit realignment.
331780 Tube is 1/2" x 4"; minimum working capacity 3 mL ; i.d. 11.66 mm, fits standard cell holder. 331781 Tube is 3/4" x 6"; minimum working capacity 5 mL ; i.d. 16.8 mm, requires 332930 Adapter. 331782 Tube is 1" x 6"; minimum working capacity 8 mL ; i.d. 22.35 mm, requires 332930 Adapter.
333385 Tungsten Lamp is rated 6.5 volt, 2.75 ampere, mounted on a prefocused base plate.
333385 Lamp, without terminal wires, is supplied with Spectronic 20 standard and regulated models.
Stray Light Filter Kit
Reduces stray light to less than 0.5%T
Filters correspond to the different optical characteristics of the photodiode detector (compared to the phototube).
Allows SPECTRONIC 20D+ to be connected to your printer or computer