new build in werribee

[GianniFocaccia]

Re: new build in werribee

Nice job, Colin. You're almost there!
John

[kbartman]

Re: new build in werribee

How much of the TC do you stick out the end of the tube.

A pic of the TC in your tube [out of the oven] would be helpful in showing this and how you keep it in place. The ones I looked at, at TC Direct had some type of coupling.

The first picture shows the tubing between holes I drilled. Held in place with straps and high temp caulk.

The second picture shows the hole below the hearth where the TC enters the tubing thru the drilled holes from above. The wire on the left is the new high temperature fiber glass wire I bought, held in place only buy the friction in inside the tubing. With measured insertion depth noted on the hearth I can pull out and replace at any time and be sure the TC is touching the brick.I plan on attaching a electrical box to the hearth below to protect and run a conduit to the location of my temperature read out.

The third picture shows the damage to the low temperature wire. I think in would have been ok, if I would had use a higher temperature glass tape. Eventually I will pull the others and replace them with the high temp wire. Although I'm sure they will continue to work for awhile.

I know it all seems rather crude, but I'm confident it will continue to be valuable and work. It was great to have all temperature reading available to me during my curing process. I was able monitor all areas of my oven and be assure all was well and heat soaking evenly and when fully saturated.

[oasiscdm]

Re: new build in werribee

Thanks KB much appreciated. In my previous post re thermowells. Is 400deg C enough.

I was looking at placing them in various places around the WFO and sealing them with a nut. The idea was that I could then take temperature readings of saturation temperature by inserting a probe having removed the nut finger tight only. I was looking at around 8 in total [some ideas as to placement appreciated]. I was really only going to have them touch the outside of the dome [again open to ideas].

Wasn't seeing the thermocouples as permanent fixture it was mainly to get a feel for the oven until I get used to it. This way all I need is a Type k probe [can be convinced otherwise].

Then I found out how bloody dear they are but have found a US site that is reasonably priced. Around $24aud for 9" and less for smaller.

Is there an advantage in making them permanent?
Is there a need to insert them into dome and hearth brick?

[kbartman]

Re: new build in werribee

Thanks KB much appreciated. In my previous post re thermowells. Is 400deg C enough.

I was looking at placing them in various places around the WFO and sealing them with a nut. The idea was that I could then take temperature readings of saturation temperature by inserting a probe having removed the nut finger tight only. I was looking at around 8 in total [some ideas as to placement appreciated]. I was really only going to have them touch the outside of the dome [again open to ideas].

Wasn't seeing the thermocouples as permanent fixture it was mainly to get a feel for the oven until I get used to it. This way all I need is a Type k probe [can be convinced otherwise].

Then I found out how bloody dear they are but have found a US site that is reasonably priced. Around $24aud for 9" and less for smaller.

Is there an advantage in making them permanent?
Is there a need to insert them into dome and hearth brick?

Colin,

Is 400C enough, I believe that is about 750F? I have seen my TC readings well above that nearing 975F on the top TC, which was drilled within 1"of brick face . The TC located on the side outside the dome, below the 5" of insulation neared 775 after a day's firing.

My TC wire is rated to about 950F. I think it will be fine, besides, with my homemade configuration it can be easily replaced.

I'm planning about 11, the switch I'm planning has 11 selectable positions.
#1 Above oven inside enclosure.
#2 Top of dome within 1" of brick face.
#3 Top of dome under insulation.
#4 Cooking side of dome near rear within 1" of brick face.
#5 Cooking side of dome near rear under insulation.
#6 Floor Cooking.
#7 Floor Center.
#8 Floor Fire side.
#9 Fire side of dome near front within 1" of brick face.
#10 Fire side of dome near front under insulation.

Advantage in making them permanent? In my opinion, I think it will continue to be valuable in trying new thinks and experimenting.

Is there a need to insert them into dome and hearth brick? Yes just my opinion. While monitoring the TC and using a IR there was considerable difference through out the brick between the readings till saturaturation was reached.

[david s]

Re: new build in werribee

Be careful if you decide not to have a thermocouple probe. If you just use the two dissimilar wires joined at the tip then they must not be in contact with each other at any other point, otherwise you will not get a correct reading. Most folk who have installed thermocouples, me included, find them interesting and instructive at first but after firing your oven about 40 times where it continues to do the same thing, they will show you the heat travels at around 1hr/inch in dense refractory, the thermocouples become pretty useless. They also fail in the long run, I don't think they are worth the expense. a cheap oven thermometer placed inside the oven for baking and roasting is cheap and effective.

[oasiscdm]

Re: new build in werribee

Thanks very definitive responses. My intention having reviewed your responses is that I have sourced some 7.94mm [either 0.9 or 1.6 mm] OD 316 stainless steel tube [round]. I will have to buy 6 metres however it is only $38. I will cut this to the lengths needed and get one end threaded as I can borrow a pipe threader so I can plug the ends. Hoping then that I can find an appropriate plug [finger tight only].

I will place these around the WFO similar to KB and finish the oven. to take temperature I will obtain a ktype probe to use initially.

KB I might even get some of that Wire you highlighted should I decide to make them a more permanent fixture. Aesthetics I will worry about later.

Thermo couples are too dear, SS Thermocouples I can obtain for a reasonable price, but the wire idea is a good one.

[brickie in oz]

Re: new build in werribee

Wasn't seeing the thermocouples as permanent fixture it was mainly to get a feel for the oven until I get used to it.

Makes you wonder how those that went before ever managed without them......

[david s]

Re: new build in werribee

The k type probe should come with its own porcelain sheath, about 3/8" in diam.

[oasiscdm]

Re: new build in werribee

Thanks guys

Alan that's why i'm not looking at making it a permanent fixture. I might make the hearth one permanent as they are hidden and out of the way.

KB found this thought you might have a look and let me know which option you would go with [as I believe you have already purchased yours].

Wholesale pid controlers Gallery - Buy Low Price pid controlers Lots on Aliexpress.com

David I will be going the porcelain probe route is what I was thinking of.

[oasiscdm]

Re: new build in werribee

Hi all

I have my keystone back dome closed this weekend.

hopefully the landing also.

palms together pointing to the heavens that weather is nice after 3 solid days of non stop rain i'm over it.

[kbartman]

Re: new build in werribee

KB found this thought you might have a look and let me know which option you would go with [as I believe you have already purchased yours].

Colin,
This is the one I purchased.Dual Digital Display PID Temperature Controller SSR(2 Alarms)-in Temperature Instruments from Industry & Business on Aliexpress.com I paid $5.83 for the unit and a thermocouple. That's' with amazon discount etc.......
At that price I figured how could I go wrong. I think my was listed $25 for just the controller.

I fired it up today I'm happy with it. At the price how can I complain.

[TropicalCoasting]

Re: new build in werribee

Makes you wonder how those that went before ever managed without them......

Probably explains how the Aboriginals learned to clean their teeth with charcoal
...no thermo couples in the camp fire

[oasiscdm]

Re: new build in werribee

Well went out this morning picked up some scrap bits of stainless steel, to make tools, after visiting doctor and specialist. Nothing serious. Was 20 bucks for 7 pieces. Picked up some 9.8mm as tube 6m round $40 and some connectors and plugs bit pricy but got extra. So I can now make as many thermowells as I want. Spoke with Karangi and will go with his recommendation of 5, with a modification since the conversation as am not sure whether I will work on the right or left now. So will duplicate his suggestion both sides of the oven making 9.

And got home and sealed the dome. Keystone in. Yay.

[Sharkey]

Re: new build in werribee

Keystone in. Yay.

At last!

Well done.

Pictures when you can please?

[oasiscdm]

Re: new build in werribee

Just teasing.....

Here tis.

In last photo Son got in his arms are longer to pull blue tack out.