Sensor Issue

6 comments

Rate

hien.nguyenquoc Power-User Join Date: Sep 2009 Location: BH, Vietnam Posts: 435 Good Answers: 1	Sensor Issue 04/08/2011 6:02 AM
	Dear friend, Today I've have an issue with the heat sensor during replacing the normal one by ex-proof one. After replacing, the fire alarm controller got alarmed. Anybody faced this before please help. __________________ Anything that can go wrong, will go wrong
	Register to Reply

Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, vote them!

kwcharlie Power-User Join Date: Jan 2010 Location: Houston off/on-shore @ Oil Patch Posts: 223 Good Answers: 2	#1 Re: Sensor Issue 04/08/2011 4:26 PM
	Probably the ex-proof sensor you put in is made to be used with a Zener Diode Barrier that won't give the same output as the non ex proof sensor you took out. __________________ Why do they make manhole covers round? so they won't fall in [before asking "Who is John Galt?"]
	Register to Reply Score 1 for Good Answer

hien.nguyenquoc Power-User Join Date: Sep 2009 Location: BH, Vietnam Posts: 435 Good Answers: 1	#2 In reply to #1 Re: Sensor Issue 04/08/2011 10:39 PM
	Kwcharlie, You are correct. The existing system has been operating without Zener Diode Barrier. While the contractor wanted to have a trial by replacing the new ex-proof without barrier, the main controller alarmed as if there was a fire in that zone. The new sensor manual suggested that it should be installed with the barrier to couple controller and sensor together. I have requested them to disconnect the trial one from the system and reinstall the existing one. Still, the controller alarmed. That zone now is disconnected to eliminate the false alarm. Could you or anyone tell me what has been wrong here? __________________ Anything that can go wrong, will go wrong
	Register to Reply

kwcharlie Power-User Join Date: Jan 2010 Location: Houston off/on-shore @ Oil Patch Posts: 223 Good Answers: 2	#3 In reply to #2 Re: Sensor Issue 04/09/2011 10:35 AM
	Maybe going back and forth with different sensors that channel needs recalibration and/or setup? Also with all the work check the wiring and connections. Think KISS [check visually; then check mechanically; last check electrically] and always check the last thing that was worked on first. __________________ Why do they make manhole covers round? so they won't fall in [before asking "Who is John Galt?"]
	Register to Reply Score 1 for Good Answer

hien.nguyenquoc Power-User Join Date: Sep 2009 Location: BH, Vietnam Posts: 435 Good Answers: 1	#4 In reply to #3 Re: Sensor Issue 04/09/2011 11:27 AM
	This afternoon, the issue has been identified by a report that the contractor has mistaken in wiring. They had disconnected the signal wires without appropriate marking. Then they reconnected. The positive wire went into the negative pole of the detector and the controller made the false alarm. __________________ Anything that can go wrong, will go wrong
	Register to Reply

PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#5 In reply to #2 Re: Sensor Issue 04/12/2011 7:19 AM
	What has been wrong is that a hazardous area sensor and wiring wasn't installed in the first place! __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
	Register to Reply Score 1 for Good Answer

hien.nguyenquoc Power-User Join Date: Sep 2009 Location: BH, Vietnam Posts: 435 Good Answers: 1	#6 In reply to #5 Re: Sensor Issue 04/12/2011 8:22 AM
	We share this idea. Cheer! __________________ Anything that can go wrong, will go wrong
	Register to Reply

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, vote them!

Copy to Clipboard

	Got Something to Say?
	Ask a Question Start a Discussion

	Aerospace
	BioMech & BioMed
	Chemical & Material Science
	Civil Engineering
	Communications & Electronics
	Education and Engineering Careers
	Electrical Engineering
	General Discussion
	Instrumentation
	Manufacturing
	Mechanical Engineering
	New Technologies & Research
	Software & Programming
	Sustainable Engineering
	Transportation

	Site Directories
	Forum Directory Blog Directory User Group Directory RSS Feeds CR4 Rules of Conduct CR4 FAQ Site Glossary Who's Online (48 right now) Show Members