15. Name two types of thermal conductivity gauges? Pirani gauge Thermocouple 16.What are procedures done in maintenance of a pressure gauge? visual inspection. Blow down and venting. cleaning and lubrication. 17. What is the necessity for the maintenance of a pressure gauge? (a) for proper working and accurate reading. (b) to improve the life and reliability of the instrument. 18. What are the applications of dead weight piston gauge? used for the measurement of higher steady pressure. for checking the elastic diaphragm or bourdon type of it is practically used as a standard of pressure measurement. 19. What fact should be taken care when using a deadweight piston gauge for testing oxygen pressure gauges? No oil must enter the gauge,because the oil vapourtogrther with the oxygen will produce an explosive mixture. 20. What is acquired through blowdown and venting ? The blowdown process removes dirt and foreign materials from an instrument line before it becomes plugged.By venting gas trapped in a liquid filled line, gas build-up can be avoided, which also causes the faulty pressure readings. 21. Name the sources of error in a filled system thermometer? Ans:i) ambient temperature effect ii) barometric effect iii) head or elevation effect iv) immersion effect v) radiation effect
15. Name two types of thermal conductivity gauges? Pirani gauge Thermocouple 16.What are procedures done in maintenance of a pressure gauge? visual inspection. Blow down and venting. cleaning and lubrication. 17. What is the necessity for the maintenance of a pressure gauge? (a) for proper working and accurate reading. (b) to improve the life and reliability of the instrument. 18. What are the applications of dead weight piston gauge? used for the measurement of higher steady pressure. for checking the elastic diaphragm or bourdon type of it is practically used as a standard of pressure measurement. 19. What fact should be taken care when using a deadweight piston gauge for testing oxygen pressure gauges? No oil must enter the gauge,because the oil vapourtogrther with the oxygen will produce an explosive mixture. 20. What is acquired through blowdown and venting ? The blowdown process removes dirt and foreign materials from an instrument line before it becomes plugged.By venting gas trapped in a liquid filled line, gas build-up can be avoided, which also causes the faulty pressure readings. 21. Name the sources of error in a filled system thermometer? Ans:i) ambient temperature effect ii) barometric effect iii) head or elevation effect iv) immersion effect v) radiation effect
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