Ohms reading across terminals of a "healthy" gas v
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Every valve has its own resistance depending on the wire in the coil. You should measure each new valve and write it in your book.
230v valves are usually about 4k and 3k. Single coil older valves about 3k.
Low voltage 24v ac are about 200-300 ohms.
I would suspect any valve more than 4% from its nominal value!
Some manufacturers will say that 10% variation is acceptable. I would say that much difference would be very abnormal.
If lower then 6% then I would suspect shorted turns and would do an LCR measurement.
Tony
230v valves are usually about 4k and 3k. Single coil older valves about 3k.
Low voltage 24v ac are about 200-300 ohms.
I would suspect any valve more than 4% from its nominal value!
Some manufacturers will say that 10% variation is acceptable. I would say that much difference would be very abnormal.
If lower then 6% then I would suspect shorted turns and would do an LCR measurement.
Tony
Some mains ones are much lower, like 1.5k, and some lower than that but get connected in series.
Modulating coils can be much lower because they only see a few volts.
It's the number of turns which determines the important properties of a solenoid, so if the wire's a bit different diameter it makes no difference, except to the resistance reading.
Modulating coils can be much lower because they only see a few volts.
It's the number of turns which determines the important properties of a solenoid, so if the wire's a bit different diameter it makes no difference, except to the resistance reading.
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