vaporstats

Flip

getting material together for my boiler install and was looking through some older threads for vaporstat numbers and ran across some less than kind words for the newer models regarding their accuracy . any news on wether they have gotten any better?

JStar

Vaporstats

Here's my take. They aren't as accurate as we'd like, but they still limit the pressure to a reasonable amount. Right now, we're pretty much stuck with the one model. I, personally, haven't had any issues with them.

Jamie Hall

Keep in mind

the distinction between accuracy (how close a measurement is to the "real" value) and precision (how repeatable the measurement is).  The newer mechanical vapourstats have excellent precision -- that is, set it at X and it will turn off at X every time, within a very narrow range.  Which is what you want.  To get the accuracy, simply have a 0 to 3 psi gauge on the same pigtail, and adjust the vapourstat to turn off when the pressure on the gauge is where you want it.  It doesn't really matter what the scale on the vapourstat says, so  long as the pressure gauge reads what you want when it turns off.



I you are fussy, though, you there is a calibration adjustment available on the vapourstat.

Flip

vaporstat

Do either of you have a p/n?

Jamie Hall

Honeywell number

L408J1009

That is the SPDT model, 0 to 16 ounce, for vapour.  Be sure when you wire it that you select the open on rise contact!

Flip

vaporstat

yes sir , thank you