Easy conversion from "Break on fall" vaporstats to "break on rise" ?

delcrossv · February 13

Seeing a number of the older mercury vaporstats on the 'bay that are "break on fall" with the contacts on the mercury tube on the left. Is there an easy way to make these break on rise? Maybe use the 'stat to power a relay coil?

Hopefully helpful pictures:

Jamie Hall · February 13

The 408B break on fall was something of an anomaly. I don't think they sold all that well — which is probably why they keep showing up on eBay and so on.

Adding a relay is the obvious way to reverse the action, although it does require power — simple wire the coil through the vapourstat with a suitable power source, and use the normally closed contacts as your signal.

ethicalpaul · February 13

Just take out the mercury bulb and reverse it. Just kidding, but maybe not really.

delcrossv · February 13

https://forum.heatinghelp.com/discussion/comment/1842439#Comment_1842439

Doable, but not easy. Have to unglue it. @Jamie Hall 's idea is much easier.

Easy conversion from "Break on fall" vaporstats to "break on rise" ?

Comments

Categories