{"id":3874,"date":"2014-05-29T10:00:54","date_gmt":"2014-05-29T15:00:54","guid":{"rendered":"https:\/\/www.coleparmer.com\/blog\/?p=3874"},"modified":"2019-09-24T11:21:56","modified_gmt":"2019-09-24T17:21:56","slug":"which-conductivity-sensor-suits-your-application-part-ii","status":"publish","type":"post","link":"https:\/\/www.coleparmer.com\/blog\/which-conductivity-sensor-suits-your-application-part-ii\/","title":{"rendered":"Which Conductivity Sensor Suits Your Application? (Part II)"},"content":{"rendered":"

In part one, we discussed measuring conductivity. Here, we continue with high purity applications and other special applications.<\/strong><\/p>\n

Low-Conductivity and High-Purity Applications<\/strong><\/p>\n

Temperature greatly influences conductivity; generally the colder the water, the lower the conductivity. \u201cMeasuring the low end of conductivity is tricky,\u201d said Frank Paparone, Global Product Manager for Water Analysis Instruments, Thermo Fisher Scientific.<\/p>\n

\u201cSince temperature can vary the result by 5% or more per \u00baC, it\u2019s important to use the correct compensation factor or none at all,\u201d he said. \u201cElectrodes with low cell constant values incorporate improved designs allowing the sensors to be more sensitive in low ranges. When carbon dioxide in air causes variations, a universal flow-through adapter will help. When conductivity is used as a relative measurement\u2014comparing two samples or identifying trends up or down\u2014it is quite a bit easier than using conductivity as\"Samples\"<\/a> an absolute measurement, particularly in pure water.\u201d<\/p>\n

High-purity water (0.055 to 1 \u00b5S\/cm) is used to produce pharmaceuticals, cosmetics, food, semiconductors, and more. When measuring high-purity water, the inverse of conductivity, \u201cresistivity,\u201d is the norm.<\/p>\n

Greater Compatibility with Solvents<\/strong><\/p>\n

Glass electrodes can handle high temperatures and are compatible with solvents. They are also easy to clean yet they are breakable. Plastic electrodes do not break, but can\u2019t be used in the presence of solvents because of chemical attack that can occur on the plastic and also have temperature limitations.<\/p>\n

\u201cFor a robust electrode with repeatable results that lasts longer and can be used with many acids, consider a graphite sensor,\u201d said Paparone. \u201cIt is more expensive but graphite is both easy to clean and compatible with most solvents.\u201d<\/p>\n

High-Salt Solutions<\/strong><\/p>\n

\"Cole-Parmer-Toroidal-Conductivity-transmitter\"<\/a>\u201cIf you double the amount of salt in solution, you will roughly double the conductivity, but only to a point. If sample dilution isn\u2019t desirable, consider ditching traditional conductivity measurements for a hydrometer, which is based on density,\u201dsaid Paparone. \u201cConductivity meters are best for solutions containing less than 5% salt.\u201d<\/p>\n

For solutions that meet this requirement, but would still be considered on the high end of the salt range, a torodial conductivity transmitter may work best. It is an industrial transmitter with an electrodeless sensor. High-salt applications in the food industry\u2014for example, using brine solutions or a plating bath\u2014utilize this technology for their measurements. Electrodeless sensors eliminate contamination and reduce long-term maintenance costs.<\/p>\n

Small Volumes and Large Volumes<\/strong><\/p>\n

A microprobe (or microsensor) or a flow-through electrode can be used in small sample sizes measured in vials or well plates. For large-volume samples, some pharmaceutical facilities use industrial cell types with fittings that connect to tanks or pipes.<\/p>\n

Watch for part three of this article posted on Friday. <\/em><\/strong><\/p>\n

View our selection of <\/em>conductivity meters, testers<\/em><\/a> and <\/em>electrodes and sensors<\/em><\/a>.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

In part one, we discussed measuring conductivity. Here, we continue with high purity applications and other special applications. Low-Conductivity and High-Purity Applications Temperature greatly influences conductivity; generally the colder the water, the lower the conductivity….<\/p>\n","protected":false},"author":20,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[364,365],"class_list":["post-3874","post","type-post","status-publish","format-standard","hentry","category-oakton-instruments","tag-conductivity-meters","tag-conductivity-sensors"],"yoast_head":"\nWhich Conductivity Sensor Suits Your Application? (Part II) | from Cole-Parmer Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.coleparmer.in\/blog\/which-conductivity-sensor-suits-your-application-part-ii\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Which Conductivity Sensor Suits Your Application? (Part II) | from Cole-Parmer Blog\" \/>\n<meta property=\"og:description\" content=\"In part one, we discussed measuring conductivity. Here, we continue with high purity applications and other special applications. 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