Boiling point digital thermometers

Fig. 358 shows another apparatus which has been described by Jirmann [5]. It consists of the switch cupboard with compensation recorder for a resistance thermometer and two distilling units for alternate operation. The apparatus covers the temperature ranges -j-100 to +385 °C and 0 to +285 °C. The automatic Herzog apparatus [6] also operates on the digital principle and prints the results immediately on a strip of paper. For standardized boiling point analyses at reduced pressure the apparatus shown schematically in Fig. 359 [6] was developed by Zappe et al. [7]. 

For the boiling point determination, we prefer the Semimicroscale Direct Method described in Technique 13, Section 13.2. The best way to perform this method is to use a digital thermometer with a stainless steel probe (see Technique 13, Section 13.4 and Figure 13.7). 

Digital Rather than using a glass thermometer to determine a boiling point or to monitor... 

Boiling point determination with a digital thermometer. 

New techniques have been introduced in this edition. Chiral gas chromatography has been included in the analysis of the products obtained from the resolution of a-phenylethylamine (Experiment 30) and the products from the chiral reduction of ethyl acetoacetate (Experiment 28). A new method of obtaining boiling points using a temperature probe with a Vernier LabPro interface or digital thermometer has been introduced. 

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