If you're joining us after receiving your InControl Newsletter Vol 1.2014 and are looking for the answers to the LFL I.Q. Test, put on your thinking caps. If you're just interested in testing your knowledge, you should bring yours too.

Q5. What does 30 feet of added sample tubing do to an analyzer’s ability to give an alarm?

a.The reading is just as accurate so that alarms will be good.

b.There is no effect, everything stays roughly the same.

c.There is a very small effect, maybe a few seconds, but not enough to matter.

d.The analyzer is several seconds slower, which matters a great deal.

Answer: d

The  analyzer is several seconds slower, which matters a great deal: NFPA-86 states, “ The length of the sample line should be minimized by locating the analyzer close to the sample point… it cannot be emphasized too strongly that solvent vapor concentration measurement system is to have a very fast response time…A response time of as little as 5 seconds might be required”. 

For more information on NFPA & LFL Read On.

Check back next week for the answer to our final question.

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