Automatic EGD Apparatus

An automated EGD apparatus has been described by Nesbitt and Wend-landt (123,124). The term automation refers here to a system that is capable of automatically introducing, heating, and ejecting the sample without the attention or assistance of an operator. A number of samples, usually eight, are preloaded in sample containers and placed in the appropriate positions on the sample tray. These are sequentially introduced imo the furnace. 

The gas flow to the furnace is controlled by a two-stage gas regulator, a metering valve, and a valved flowmeter. Gas leaving the flowmeter passes first through one port of the thermostated thermistor-type thermal conductivity cell, and then exhausts to the atmosphere. The two-pen recorder 

The obvious advantage of this apparatus is the automatic changing of the eight samples contained in the sample tray. Operation is completely automatic and once started, it does not require the attention of the operator. By the addition of a suitable data-logging system, the apparatus can be made semiquantitative if carefully calibrated. 

---