Capacitive level meters for cryogenic liquids with continuous read-out
The operation of a variety of liquid level meters is briefly considered. Currently used continuous read-out level meters, whose operation is based on the difference between the dielectric constants of the gas and the liquid measured, are compared. The requirements for cryogenic application of these...
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| Veröffentlicht in: | Cryogenics (Guildford) 1990-06, Vol.30 (6), p.538-544 |
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| container_title | Cryogenics (Guildford) |
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| creator | Velichkov, I.V. Drobin, V.M. |
| description | The operation of a variety of liquid level meters is briefly considered. Currently used continuous read-out level meters, whose operation is based on the difference between the dielectric constants of the gas and the liquid measured, are compared. The requirements for cryogenic application of these level meters are discussed. An electronic circuit for capacitance measurements with high stability and resolution better than 20 ppm is described along with construction details of capacitance transducers both for liquid nitrogen and liquid helium. The parameters of two particular level meters are reported as follows. For liquid nitrogen: measuring length 50 cm; overall error < 1% at full scale deviation (FSD); short time instabilities < 0.01% FSD; resolution better than 0.05 mm. For liquid helium: measuring length 60 cm; overall error < 5% FSD; short time instabilities < 0.2% FSD; resolution better than 1 mm. |
| doi_str_mv | 10.1016/0011-2275(90)90056-I |
| format | Article |
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Currently used continuous read-out level meters, whose operation is based on the difference between the dielectric constants of the gas and the liquid measured, are compared. The requirements for cryogenic application of these level meters are discussed. An electronic circuit for capacitance measurements with high stability and resolution better than 20 ppm is described along with construction details of capacitance transducers both for liquid nitrogen and liquid helium. The parameters of two particular level meters are reported as follows. For liquid nitrogen: measuring length 50 cm; overall error < 1% at full scale deviation (FSD); short time instabilities < 0.01% FSD; resolution better than 0.05 mm. 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Currently used continuous read-out level meters, whose operation is based on the difference between the dielectric constants of the gas and the liquid measured, are compared. The requirements for cryogenic application of these level meters are discussed. An electronic circuit for capacitance measurements with high stability and resolution better than 20 ppm is described along with construction details of capacitance transducers both for liquid nitrogen and liquid helium. The parameters of two particular level meters are reported as follows. For liquid nitrogen: measuring length 50 cm; overall error < 1% at full scale deviation (FSD); short time instabilities < 0.01% FSD; resolution better than 0.05 mm. For liquid helium: measuring length 60 cm; overall error < 5% FSD; short time instabilities < 0.2% FSD; resolution better than 1 mm.</description><subject>capacitance measurements</subject><subject>Exact sciences and technology</subject><subject>helium</subject><subject>liquid level meters</subject><subject>Measurements common to several branches of physics and astronomy</subject><subject>measuring techniques</subject><subject>Metrology, measurements and laboratory procedures</subject><subject>nitrogen</subject><subject>Physics</subject><subject>Spatial dimensions (e.g.: position, lengths, volume, angles, displacements, including nanometer-scale displacements)</subject><issn>0011-2275</issn><issn>1879-2235</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1990</creationdate><recordtype>article</recordtype><recordid>eNp9kEFLAzEQhYMoWKv_wEMOInpYTbKb3c1FkGK1UPDSe5gmsxrZbtokW-m_d2ulR08Dw3tv3nyEXHP2wBkvHxnjPBOikneK3SvGZJnNTsiI15Ua1rk8JaOj5JxcxPjFGCtEKUZkOoE1GJfcFmmLW2zpChOGSBsfqAk7_4GdM7R1m97ZSL9d-qTGd8l1ve8jDQg28326JGcNtBGv_uaYLKYvi8lbNn9_nU2e55nJyyJluS0tLwGWaPJGCssFLjnU1sqhTGmtqIpcCFBFLRUIK1ljlpDXojKGA4N8TG4PsevgNz3GpFcuGmxb6HCoo4WUSlVFNQiLg9AEH2PARq-DW0HYac70npneA9F7IFox_ctMzwbbzV8-RANtE6AzLh69ktVK8X3600GGw6tbh0FH47AzaF1Ak7T17v87P_mFgKU</recordid><startdate>19900601</startdate><enddate>19900601</enddate><creator>Velichkov, I.V.</creator><creator>Drobin, V.M.</creator><general>Elsevier Ltd</general><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>F28</scope><scope>FR3</scope></search><sort><creationdate>19900601</creationdate><title>Capacitive level meters for cryogenic liquids with continuous read-out</title><author>Velichkov, I.V. ; Drobin, V.M.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c364t-3d6d16aabec3f52d12eb1a8dd52626dd274322a94859a2d50fcba3827cc1a0a3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1990</creationdate><topic>capacitance measurements</topic><topic>Exact sciences and technology</topic><topic>helium</topic><topic>liquid level meters</topic><topic>Measurements common to several branches of physics and astronomy</topic><topic>measuring techniques</topic><topic>Metrology, measurements and laboratory procedures</topic><topic>nitrogen</topic><topic>Physics</topic><topic>Spatial dimensions (e.g.: position, lengths, volume, angles, displacements, including nanometer-scale displacements)</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Velichkov, I.V.</creatorcontrib><creatorcontrib>Drobin, V.M.</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>ANTE: Abstracts in New Technology & Engineering</collection><collection>Engineering Research Database</collection><jtitle>Cryogenics (Guildford)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Velichkov, I.V.</au><au>Drobin, V.M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Capacitive level meters for cryogenic liquids with continuous read-out</atitle><jtitle>Cryogenics (Guildford)</jtitle><date>1990-06-01</date><risdate>1990</risdate><volume>30</volume><issue>6</issue><spage>538</spage><epage>544</epage><pages>538-544</pages><issn>0011-2275</issn><eissn>1879-2235</eissn><coden>CRYOAX</coden><abstract>The operation of a variety of liquid level meters is briefly considered. Currently used continuous read-out level meters, whose operation is based on the difference between the dielectric constants of the gas and the liquid measured, are compared. The requirements for cryogenic application of these level meters are discussed. An electronic circuit for capacitance measurements with high stability and resolution better than 20 ppm is described along with construction details of capacitance transducers both for liquid nitrogen and liquid helium. The parameters of two particular level meters are reported as follows. For liquid nitrogen: measuring length 50 cm; overall error < 1% at full scale deviation (FSD); short time instabilities < 0.01% FSD; resolution better than 0.05 mm. For liquid helium: measuring length 60 cm; overall error < 5% FSD; short time instabilities < 0.2% FSD; resolution better than 1 mm.</abstract><cop>Oxford</cop><pub>Elsevier Ltd</pub><doi>10.1016/0011-2275(90)90056-I</doi><tpages>7</tpages></addata></record> |
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| ispartof | Cryogenics (Guildford), 1990-06, Vol.30 (6), p.538-544 |
| issn | 0011-2275 1879-2235 |
| language | eng |
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| source | Elsevier ScienceDirect Journals |
| subjects | capacitance measurements Exact sciences and technology helium liquid level meters Measurements common to several branches of physics and astronomy measuring techniques Metrology, measurements and laboratory procedures nitrogen Physics Spatial dimensions (e.g.: position, lengths, volume, angles, displacements, including nanometer-scale displacements) |
| title | Capacitive level meters for cryogenic liquids with continuous read-out |
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