Furnace Inconsistant Light-Off

[Oscar_Lives]

How much current could a current sensor sense if a current sensor could sense current?

[DIMwit]

[Bob_Loblaw]

DANgER ( [e-mail]) wrote

Like I posted earlier, the older Coleman's have a sequencer. That could very easily be the problem. Think "Clare Mega-junk"! If not, I agree about the module.

[Marc Anderson]

Oscar_Lives wrote: ...

There ain't NOTHIN on an aircraft that costs only $1.49 !

There's a computer worth a couple hundred thousand bucks (not kidding) that controls the engine, and it's monitoring a whole pile of sensors.

I only meant that the CONCEPT of monitoring heater current is used as verification of correct operation in some systems, and it's not necessarily on the engine (electrical de-icing systems for example).

Marc

[Marc Anderson]

There's the little peep-window that you can open to see the igniter ? (its got a sight-glass on it) If I leave that little window open, the sucker lights off !!! WTF !? Marc

[Oscar_Lives]

My neighbor's house has a little peep window, and when I look in it at his wife, I light off!

WTF?

[Bubba]

That little window is for shipping only. Remove it for normal operation. You may need to install a "lite-off@booster. Bubba

[MLD]

Right you are. A component called a "flame sensor" is used in the afterburner and signals the control system as to whether or not the afterburner is lit. It uses the ultra violet wave lengths of the "fire" to excite a gas within the sensor. It basically acts as an Off/On switch but it's signal has a significant impact on the control system and on the behavior of the engine. Then there is a thermocouple harness downstream of the combustor which has, maybe 12 or more thermocouple probes, each with at least 4-5 individual thermocouples (chromel/alumel) at different immersions. The end result is that there are about 60 individual temperature readings that are averaged to give one cockpit turbine temperature readout. You're also right about the price--nothing is cheap. MLD