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<http://webisa.webdatacommons.org/prov/315492979>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/312928003> .
<http://webisa.webdatacommons.org/312928003>	<http://www.w3.org/ns/prov#value>	"They provide rapid on/off control of dosing and are used in applications such as food processing, hydroponics, water purification, and waste control. pH controllers differ in terms of control type and provide limit control, linear control, or non-linear control." .
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<http://webisa.webdatacommons.org/312928003>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<globalspec.com> .