For demonstrating the characteristic spectra of Natrium (Na) and Helium (He) together. Natrium, however, at room temperature does not have a vapor pressure that is high enough for use in a spectral tube. So by adding helium as carrier gas, it can be used. The spectrum therefore becomes a combination of the two substances line spectra. This can be used as an "unknown test" (remember to remove the label).
The tube is to be used with the 285570 spectral tube holder, which also includes a controllable power supply (use 220 V AC).
The spectral tube has a voltage of between 3 and 6 kV - the operating voltage, however, is significantly lower. Spectral tube power supply supplies the tube with a constant current, thus regulating the operating voltage automatically.
The power level should be set as low as possible for sustaning the life of the tube, and the tube should therefore not run continuously. Therefore, when using high current levels, it should be considered to hold breaks in order to allow the tube to cool down.
Dimensions: Length approx. 224 mm, capillary tube Ø 6 x 80 mm.