Hi, wonder if anyone can help me. I have this energiser board that I have replaced the resistors on but I'm stuck as to what the item is on the photo. Is it a capacitor? There are no markings on it. The board has LP1 marked in its place.

It looks like a blown glass bulb but don't think it is a bulb as it is inside a sealed box.



Any help would be great,
Cheers
Chris

 

LP usually means lamp, just because it's inside a case doesn't mean there can't be a lamp in there.
Could be a neon perhaps.

 

It looks like an NE2 neon lamp and the 47k resistor feeding it would be right for 120VAC but sometimes they're used as a high voltage trigger instead of for their light output.

http://www.bristolwatch.com/ele/neon.htm

 

This is definitely a neon lamp. Generally they are used to indicate the presence of high voltage.

 

It looks like an NE2 neon lamp and the 47k resistor feeding it would be right for 120VAC but sometimes they're used as a high voltage trigger instead of for their light output.

http://www.bristolwatch.com/ele/neon.htm

This board is to energise an electric fence 12volt dc system

 

This board is to energise an electric fence 12volt dc system

Yes, that outputs 10kV.

 

Okay. High voltage trigger function then.

 

Okay. High voltage trigger function then.

Agreed.

 

Or, it's only there to indicate the presence of HT.

 

Or, it's only there to indicate the presence of HT.

*ahem*

This is definitely a neon lamp. Generally they are used to indicate the presence of high voltage.

 

+1 for trigger neon, usually when they go black like that their useful life is over.
Max.

 

I put a HV bird wire zapper on a lighthouse. The power unit has a neon lamp on the front to indicate it is working.

This unit puts out a pulse about once a sec, and ytou can confirm it is working by observing the neon bulb.

I also got a tester for the lines, basically a series of neon bulbs marked for voltages in the 1,000's of volts. Each lamp meaks a higher voltage.

Not very arrurate but no one really cares if it is 2,387 volts when "over 2KV" is ample information.