Instruments: [Daily Question] January 4, 2011

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This post was last edited by cnooczhouyx on 2011-1-5 08:30. [Daily Question] Question for January 4, 2011: 1. Differential pressure transmitters with diaphragm box structures typically measure differential pressures that are much lower than the operating pressure. Due to operational or other factors, it is inevitable that the diaphragm will be under pressure in one direction; in order to prevent the measuring element from being affected by this, there is always ( ) in the diaphragm box structure. A) Limiting device B) Locking device C) Pressure relief device D) One-way overload protection device 2. The operating temperature range for the PTFE packing on the valve cover of control valves is not suitable for ( ). A) 20–150°C B) -40–250°C C) -40–450°C (with cooling method) D) 200–600°C Notes: 1) The first 50 participants will definitely receive a reward; no additional points will be given for more than 50 participants. Among them, the top 20 who give correct answers will receive a “Wealth 5” award, while those from 21st to 50th will receive a participation award. Those who get 3 correct answers receive a certain reward, and those who get 2 incorrect answers receive another ； Points may be awarded additionally for detailed analysis, in-depth discussion, and discretion ； 2) Please hide your replies; the method for doing this is at http://bbs.hcbbs.com/thread-492556-1-1.html. Do not edit the replies after posting them. (No rewards will be given for any replies that are not hidden. ) 3) Posts that expire will be closed, and the answers will become visible after the post is closed ； Thank you all for your participation ； 【Daily Question】Answer for January 4, 2011: 1. D 2. D.