Portable gas monitors : some problems of zero drift, response time and selectivity solved with "gas-modifier pumps"

<?xml version="1.0" encoding="UTF-8"?><collection xmlns="http://www.loc.gov/MARC21/slim" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/MARC21/slim http://www.loc.gov/standards/marcxml/schema/MARC21slim.xsd">
  <record>
    <leader>00000nab a2200000 i 4500</leader>
    <controlfield tag="001">MAP20071017757</controlfield>
    <controlfield tag="003">MAP</controlfield>
    <controlfield tag="005">20080418115156.0</controlfield>
    <controlfield tag="007">hzruuu---uuuu</controlfield>
    <controlfield tag="008">940307s1986    gbr||||    | |00010|eng d</controlfield>
    <datafield tag="035" ind1=" " ind2=" ">
      <subfield code="a">6800003081</subfield>
    </datafield>
    <datafield tag="040" ind1=" " ind2=" ">
      <subfield code="a">MAP</subfield>
      <subfield code="b">spa</subfield>
    </datafield>
    <datafield tag="084" ind1=" " ind2=" ">
      <subfield code="a">872</subfield>
    </datafield>
    <datafield tag="100" ind1="1" ind2=" ">
      <subfield code="0">MAPA20080020347</subfield>
      <subfield code="a">Bergman, I.</subfield>
    </datafield>
    <datafield tag="245" ind1="1" ind2="0">
      <subfield code="a">Portable gas monitors</subfield>
      <subfield code="b">: some problems of zero drift, response time and selectivity solved with "gas-modifier pumps"</subfield>
      <subfield code="c">I. Bergman</subfield>
    </datafield>
    <datafield tag="520" ind1=" " ind2=" ">
      <subfield code="a">The detection and monitoring of toxic gases in industrial atmospheres with the aid of direct-reading instruments presents a number of problems, these may include: zero drift; slow response; lack of selectivity; and insensitivity to some gases. These problems can be ameliorated or overcome by sequentially exposing the sensor to a series of samples, some or all of which have been pumped though gas midifier layers to remove or modify relevant constituents of the gas stream. The requirements of such a system and suitable designs of pumps for application to fixed of portable monitors or alarms are discussed</subfield>
    </datafield>
    <datafield tag="650" ind1="1" ind2="1">
      <subfield code="0">MAPA20080585679</subfield>
      <subfield code="a">Higiene industrial</subfield>
    </datafield>
    <datafield tag="650" ind1="1" ind2="1">
      <subfield code="0">MAPA20080605278</subfield>
      <subfield code="a">Contaminantes químicos</subfield>
    </datafield>
    <datafield tag="650" ind1="1" ind2="1">
      <subfield code="0">MAPA20080616441</subfield>
      <subfield code="a">Contaminación atmosférica</subfield>
    </datafield>
    <datafield tag="650" ind1="1" ind2="1">
      <subfield code="0">MAPA20080591113</subfield>
      <subfield code="a">Gases contaminantes</subfield>
    </datafield>
    <datafield tag="650" ind1="1" ind2="1">
      <subfield code="0">MAPA20080565817</subfield>
      <subfield code="a">Gases tóxicos</subfield>
    </datafield>
    <datafield tag="650" ind1="1" ind2="1">
      <subfield code="0">MAPA20080621186</subfield>
      <subfield code="a">Control de la contaminación</subfield>
    </datafield>
    <datafield tag="650" ind1="1" ind2="1">
      <subfield code="0">MAPA20080551797</subfield>
      <subfield code="a">Muestreos</subfield>
    </datafield>
    <datafield tag="650" ind1="1" ind2="1">
      <subfield code="0">MAPA20080590338</subfield>
      <subfield code="a">Detectores de gases</subfield>
    </datafield>
    <datafield tag="740" ind1="4" ind2=" ">
      <subfield code="a">The Annals of occupational hygiene</subfield>
    </datafield>
    <datafield tag="773" ind1="0" ind2=" ">
      <subfield code="t">The Annals of occupational hygiene</subfield>
      <subfield code="d">Oxford [etc.]</subfield>
      <subfield code="g">nº 4, 1986 ; p. 469-479</subfield>
    </datafield>
  </record>
</collection>