Ok, I had my first trip to ESPNW- the Promised land!! I got all the stuff I needed and some great advice- Thanks all!
So now for the curve ball.. I got home, screwed in my Pstat- and I am just about ready to fire it up and adjust it and I look closely and see a bigger screw( with a + / --... Ok I was prepared for that..... AND a little bitty screw with + /- .

A pair? So Is the big one adjust the top( high temp of the deadband and the little one adjust the low end of the deadband??

I want to be careful here as I was just expecting one screw with a pre-set tight gap between on / off....

Someone please clarify.

Thanks

This is a unique thing Ceme tried for a while. The centered screw adjusts the pressure, as in all pstats, while the side screw widens or narrows the deadband. However, the deadband screw does not make a huge difference (roughly from 0.15 bar to 0.25), and they've dropped it again in recent models.

My advice is just to leave it be -- The Cemes are more reliable than the Maters, but the setting screw mounts are flimsy and tend to break after the plastic gets old when one adjusts them. So set it when it's new and forget it, and you'll get good service from them

Ok, I should just use the bigger of the two, to raise / lower the top end of the setting and leave it at that?

greg

Ok,

The little screw messed with me a few cycles, it seems you can turn through the range of adjustment it has. It seems to have a bell shaped curve adjustment. As you turn it all the way around, it starts over. If that makes sense...

It now cycles from .95bar- 1.05 bar- Thats pretty tight.. worrier , too tight ....We'll see

Thanks Jim- You chimed in in REAL time -

Ok,
I fiddled with the screws, got a great tight deadband.......... .9--1.05bar .. for about 30 -45 minutes...I am grinning from ear to ear. Then after I moved it in to position , hooked up the water line, put the cabinetry back on, it crept up to 1.1-- 1.25bar...... adjusted it ever so slightly back down. Now its about 1.1--1.4??? So just to make sure, and plus it is nighttime and EPNW is closed, has anybody else had a brand new CEME Pstat do this?? I am headed to a phone call tomorow to see if I have a bad one or what the dang deal is.. maybe I adjusted it backwards?????

I guess I am hoping they take a while to settle in.. but just reading these words makes that sound pretty stupid

I had a Mater that was working fine. Got a Ceme for a tighter deadband that lasted a day. (I broke the adjustment screw even though thought I was being careful) Put the Mater back in. Got a Barksdale for tigher deadband. Put it in. Been happy as a clam with 0.05bar heater on deadband (0.1 total deadband including overshoot) and zero drift for over half a year.

Again, it's best not to adjust the deadband screw at all, and the pressure screw minimally. Try to get the deadband screw back to it's original setting. Put in the Ceme set it up the same way you use the machine, check the pressure, make the final adjustment.

I have had the same, settling problem on my Ceme. First, I don't mess with the deadband adjustment. Second, the Ceme is very sensitive, putting a screwdriver on the adjustment screw will make the pressure change.

When I set my pstat, I turn off the machine, make a very, very small adjustment and turn it on to see what happened. When I get it where I want, I power it down and let it cool. Then power back up, I do that a couple times as well as 'exercising' the pstat by long steam purges. The pstat usually drifts just a little during the process. Then I readjust and repeat. Yes it is annoying. Once it is set and settled, it is good for the long haul. My Isomac has the Ceme and is over two years old, never had it stick. It runs like a champ on my machine, once you get it over the mood swings.

Opps, in that case, like Cannonfodder said. I've put in two now, one on the Elektra, one on the Isomac, and I must have gotten lucky with getting a quick initial adjustment.

Ok, I feel a little better. I only messed with the deadband small screw at first. I have since let her alone. I have noticed even touching the bigger set screw will turn the element off or on.... so I will keep messing with it a few more times, even though I have been very gentle turning it.
Thanks again all for the guidance on this "seemingly " simple detail that is perplexing me!!