ASTM E516-95a(2005)
(Practice)Standard Practice for Testing Thermal Conductivity Detectors Used in Gas Chromatography
Standard Practice for Testing Thermal Conductivity Detectors Used in Gas Chromatography
SIGNIFICANCE AND USE
Although it is possible to observe and measure each of the several characteristics of a detector under different and unique conditions, it is the intent of this practice that a complete set of detector specifications should be obtained at the same operating conditions. It should be noted also that to specify a detector’capability completely, its performance should be measured at several sets of conditions within the useful range of the detector. The terms and tests described in this practice are sufficiently general so that they may be used at whatever conditions may be chosen for other reasons.
Linearity and speed of response of the recorder used should be such that it does not distort or otherwise interfere with the performance of the detector. Effective recorder response, Refs. (5, 6) in particular, should be sufficiently fast that it can be neglected in sensitivity of measurements. If additional amplifiers are used between the detector and the final readout device, their characteristics should also first be established.
SCOPE
1.1 This practice is intended to serve as a guide for the testing of the performance of a thermal conductivity detector (TCD) used as the detection component of a gas chromatographic system.
1.2 This practice is directly applicable to thermal conductivity detectors which employ filament (hot wire) or thermistor sensing elements.
1.3 This practice is intended to describe the performance of the detector itself independently of the chromatographic column, in terms which the analyst can use to predict overall system performance when the detector is coupled to the column and other chromatography system components.
1.4 For general gas chromatographic procedures, Practice E 260 should be followed except where specific changes are recommended herein for the use of a TCD. For definitions of gas chromatography and its various terms see Practice E 355.
1.5 For general information concerning the principles, construction, and operation of TCD see Refs. ().
1.6 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific safety information, see Section 4.
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Designation: E516 − 95a (Reapproved2005)
Standard Practice for
Testing Thermal Conductivity Detectors Used in Gas
1
Chromatography
This standard is issued under the fixed designation E516; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2. Referenced Documents
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1.1 This practice is intended to serve as a guide for the 2.1 ASTM Standards:
testing of the performance of a thermal conductivity detector E260Practice for Packed Column Gas Chromatography
(TCD) used as the detection component of a gas chromato- E355PracticeforGasChromatographyTermsandRelation-
graphic system. ships
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1.2 This practice is directly applicable to thermal conduc- 2.2 CGA Standards:
CGAP-1SafeHandlingofCompressedGasesinContainers
tivity detectors which employ filament (hot wire) or thermistor
sensing elements. CGAG-5.4 Standard for Hydrogen Piping Systems at
Consumer Locations
1.3 This practice is intended to describe the performance of
CGAP-9 The Inert Gases: Argon, Nitrogen and Helium
the detector itself independently of the chromatographic
CGAV-7 Standard Method of Determining Cylinder Valve
column, in terms which the analyst can use to predict overall
Outlet Connections for Industrial Gas Mixtures
system performance when the detector is coupled to the
CGAP-12Safe Handling of Cryogenic Liquids
column and other chromatography system components.
HB-3 Handbook of Compressed Gases
1.4 For general gas chromatographic procedures, Practice
E260 should be followed except where specific changes are
3. Significance and Use
recommended herein for the use of a TCD. For definitions of
3.1 Although it is possible to observe and measure each of
gas chromatography and its various terms see Practice E355.
the several characteristics of a detector under different and
1.5 For general information concerning the principles,
unique conditions, it is the intent of this practice that a
2
construction, and operation of TCD see Refs. (1-4).
complete set of detector specifications should be obtained at
the same operating conditions. It should be noted also that to
1.6 The values stated in SI units are to be regarded as
specify a detector’s capability completely, its performance
standard. No other units of measurement are included in this
should be measured at several sets of conditions within the
standard.
useful range of the detector. The terms and tests described in
1.7 This standard does not purport to address all of the
thispracticearesufficientlygeneralsothattheymaybeusedat
safety concerns, if any, associated with its use. It is the
whatever conditions may be chosen for other reasons.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- 3.2 Linearity and speed of response of the recorder used
bility of regulatory limitations prior to use. For specific safety should be such that it does not distort or otherwise interfere
3
with the performance of the detector. Effective recorder
information, see Section 4.
response, Refs. (5, 6) in particular, should be sufficiently fast
that it can be neglected in sensitivity of measurements. If
1
This practice is under the jurisdiction ofASTM Committee E13 on Molecular
Spectroscopy and Separation Science and is the direct responsibility of Subcom-
mittee E13.19 on Separation Science.
4
Current edition approved Sept. 1, 2005. Published September 2005. Originally For referenced ASTM standards, visit the ASTM website, www.astm.org, or
approved in 1974. Last previous edition approved in 2000 as E516–95a(2000). contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
DOI: 10.1520/E0516-95AR05. Standards volume information, refer to the standard’s Document Summary page on
2
Theboldfacenumbersinparenthesesrefertothelistofreferencesattheendof the ASTM website.
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this practice. Available from Compressed Gas Association (CGA), 4221 Walney Rd., 5th
3
See Appendix X1. Floor, Chantilly, VA 20151-2923, http://www.cganet.com.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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E516 − 95a (2005)
additional amplifiers are used between the detector and the 5.2.5.8 Method of measurement, and
final readout device, their characteristics should also first be
5.2.5.9 Type of power supply (for example, constant
established.
voltage, constant current).
5.2.5.10 For capillary detectors, the make-up gas, carrier,
4. Hazards
and reference flows should be stated.
4.1 Gas Handling Safety—Thesafehandlingofcompressed
5.3 Methods of Mea
...
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