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J Neurosci Methods

Title:		Equations for nickel-chromium wire heaters of column transfer lines in gas chromatographic-electroantennographic detection (GC-EAD)
Author(s):		Byers JA;
Address:		"USDA-ARS Western Cotton Research Laboratory, 4135 E. Broadway Road, Phoenix, AZ 85040, USA. jbyers@wcrl.ars.usda.gov"
Journal Title:		J Neurosci Methods
Year:		2004
Volume:		135
Issue:		1-Feb
Page Number:		89 - 93
DOI:		10.1016/j.jneumeth.2003.12.004
ISSN/ISBN:		0165-0270 (Print) 0165-0270 (Linking)
Abstract:		"Heating of chromatographic columns, transfer lines, and other devices is often required in neuroscience research. For example, volatile compounds passing through a capillary column of a gas chromatograph (GC) can be split, with half exiting the instrument through a heated transfer line to an insect antenna or olfactory sensillum for electroantennographic detector (GC-EAD) recordings. The heated transfer line is used to prevent condensation of various chemicals in the capillary that would otherwise occur at room temperature. Construction of such a transfer line heater is described using (80/20%) nickel-chromium heating wire wrapped in a helical coil and powered by a 120/220 V ac rheostat. Algorithms were developed in a computer program to estimate the voltage at which a rheostat should be set to obtain the desired heater temperature for a specific coil. The coil attributes (radius, width, number of loops, or length of each loop) are input by the user, as well as AWG size of heating wire and desired heater temperature. The program calculates total length of wire in the helix, resistance of the wire, amperage used, and the voltage to set the rheostat. A discussion of semiochemical isolation methods using the GC-EAD and bioassays is presented"
Keywords:		"Algorithms Chromatography, Gas/instrumentation/*methods Chromium/*chemistry Electrodes Electrophysiology/*methods Energy Transfer Equipment Design Heating/*instrumentation Nickel/*chemistry Temperature;neuroscience;"
Notes:		"MedlineByers, John A eng Comparative Study Netherlands 2004/03/17 J Neurosci Methods. 2004 May 30; 135(1-2):89-93. doi: 10.1016/j.jneumeth.2003.12.004"