Universal joint, precision

Figure 5.33 Precision IM of universal joint RP molded of glass fiber/nylon 6/6 molding compound...

An automated system called the short-path thermal desorber (SPTD) (Fig. 2) was developed jointly by researchers at Rutgers University and Scientific Instrument Services of Ringoes, New Jersey (an independent company, separate from the previously mentioned SIS) (14). This instrument is placed on top of the GC injection port and can be adjusted to allow conventional injections without disconnecting the unit. The sample is placed in a glass-lined stainless steel tube and held in place with glass wool. An injection needle is affixed to one end and the other end is screwed into the SPTD. The injection is made pneumatically, and the sample is not heated prior to injection. Control of the temperature, desorption time, and equilibration are provided by an electronic controlling unit. An automated system has an inherent advantage over manual systems for improved reproducibility from one run to the next. Quantitative data with a precision of less than 5% STD has been reported (15). 

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