Petroleum Instrumentation NGT 160 Basics Instrumentation Chapter 8

Petroleum Instrumentation NGT 160 Basics Instrumentation Chapter 8 Liquid-Level Measurement and Control “This product was funded by a grant awarded by the U. S. Department of Labor’s Employment and Training Administration. The product was created by the grantee and does not necessarily reflect the official position of the U. S. Department of Labor. The Department of Labor makes no guarantees, warranties, or assurances of any kind, express or implied, with respect to such information, including any information on linked sites and including, but not limited to, accuracy of the information or its completeness, timeliness, usefulness, adequacy, continued availability, or ownership. ” Unless otherwise specified, this work by Shale. NET U. S. is licensed under a Creative Commons Attribution 4. 0 International License.

Liquid Level (125) • • Level is measured in unit lengths Level can be determined from weight – head pressure • Sight glass or gauge

Liquid Level • Buoyancy (126)

Liquid Level • Electric – on / off (134)

Liquid Level • Proportional - Capacitance (135)

Liquid Level • • • Resistive (136) Magnetic switches Metritape

Liquid Level • • Electronic Transmitters (137) Differential pressure using hydrostatic pressure

Liquid Level • Level control example (139)

Liquid Level • Summary (140) • Review Exercise (141)

Level Measurement – Amatrol LAP