Hello,
For my part, I have several thermo regulators with OMRON display and PT100 probes which go with (draft figo regulated at 1/10 C °) purchased for "a bite of bread" on a flea market (big bite as well! )
If qq on the side of Bxl has plans, I am ready to help and lend / provide gear at a good price ...
@ ++ B)
TEMPERATURE MEASUREMENT EQUIPMENT
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- I posted 500 messages!
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- I posted 500 messages!
- posts: 749
- Registration: 31/03/04, 07:37
- Location: Brussels
gegyx wrote:For thermocouples, there is this:
.... At the CNRS, when they don't buy them, they make them with rhodium platinum, overpriced (it doesn't bother them).
.....
Hello,
Rodhium? cool! :
Fine rhodium
(in Euros per Kilo)
64684 purchase sale 90121 (in € per Kg)
@ ++
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This is not because we always said that it is impossible that we should not try
Beginning of understanding about thermocouples
Type K thermocouple (Chromel-Alumel, i.e. nickel-chrome / nickel-aluminum), is recommended for temperatures from 0 ° to 1100 ° (over a short period from –180 ° to + 1300 °).
It is the widest range of temperature, it is the most common, the cheapest; so this is the one that interests us.
According to one doc, there are 19 ways to mount thermocouples.
The one that interests us (at the lowest price) is the "basic thermocouple": Simple thermocouple with "hot weld" (at the end), carried out under neutral gas (argon).
Several diameters are available, from 0,2 to 1,63mm.
They can be offered naked.
They can be offered in a sheath. At that time, the maximum temperature proposed with these K thermocouples, is the maximum temperature that the ducts can withstand…
PVC (-30 to +75). Silicone rubber (service: -40 to +200). PR = Crosslinked polyethylene (-30 to +75). Mica + PR (-30 to +75, but fire resistant to 750 °). Teflon (-75 to +250).
Glass silk (480, point at 540 °). High temp glass silk (800 °). Ceramic fiber (-185 to + 1400 °).
Among sellers, we offer under the name "thermocouples" , finished sensors, ready for use (the 2 thermocouple cables were welded under argon. These "probes" can be adhesive, glued, on magnet, on collars, jacketed (Teflon, ceramic, stainless steel, platinum refractory steel, inconel ….),… Etc. The price is substantial depending on the use.
Under the name "single thermocouples", is proposed cable in reel of 2 or 5 m, one end of which has its hot weld, made under argon.
Under the name "extension cables" , is proposed the same type of cable, seamless, and the composition of the alloys is identical to that of the previous sensors. But, it must end with a solder on the end, which will connect the 2 cables of different composition; this solder, in contact with a temperature will create a potential difference with the "cold solder", which comes on a special assembly or on the terminals of a meter; A voltmeter can measure these –6,4 mv (-270 °) to + 54,8mv (1370 °) for a type K, cold junction at 0 °.
the "extension cable" is the most economical.
It is offered at Radiospares (price excluding tax):
-Thermocouple K, sheathed glass (-50 to 400 °), 2 m with a weld already made at the end
ref: 219-4309 at € 9,38. (we can cut ends, weld them, and redo sensors)
-K extension cables, 0,3mm, glass (+ 480 °), 10m.
ref: 219-4589 at € 15,71
-K extension cables, glass (+ 480 °), 10m ref: 151-209 at 14,74 €
Under the name "compensation cable" , it is a cable (of special composition, but of different alloys from the thermocouple cable), which makes it possible to extend the data of the sensor, over a greater distance without great attenuation, unlike simple electrical conductors in copper.
If you also want to buy a "k-type thermometer", which will read the temperature directly, you will also have to think about buying the appropriate connection connectors (quite expensive) ...
Important reminder :
Type K thermocouple (Chromel-Alumel, i.e. nickel-chrome / nickel-aluminum), is recommended for temperatures from 0 ° to 1100 ° (over a short period from –180 ° to + 1300 °).
It is the widest range of temperature, it is the most common, the cheapest; so this is the one that interests us.
According to one doc, there are 19 ways to mount thermocouples.
The one that interests us (at the lowest price) is the "basic thermocouple": Simple thermocouple with "hot weld" (at the end), carried out under neutral gas (argon).
Several diameters are available, from 0,2 to 1,63mm.
They can be offered naked.
They can be offered in a sheath. At that time, the maximum temperature proposed with these K thermocouples, is the maximum temperature that the ducts can withstand…
PVC (-30 to +75). Silicone rubber (service: -40 to +200). PR = Crosslinked polyethylene (-30 to +75). Mica + PR (-30 to +75, but fire resistant to 750 °). Teflon (-75 to +250).
Glass silk (480, point at 540 °). High temp glass silk (800 °). Ceramic fiber (-185 to + 1400 °).
Among sellers, we offer under the name "thermocouples" , finished sensors, ready for use (the 2 thermocouple cables were welded under argon. These "probes" can be adhesive, glued, on magnet, on collars, jacketed (Teflon, ceramic, stainless steel, platinum refractory steel, inconel ….),… Etc. The price is substantial depending on the use.
Under the name "single thermocouples", is proposed cable in reel of 2 or 5 m, one end of which has its hot weld, made under argon.
Under the name "extension cables" , is proposed the same type of cable, seamless, and the composition of the alloys is identical to that of the previous sensors. But, it must end with a solder on the end, which will connect the 2 cables of different composition; this solder, in contact with a temperature will create a potential difference with the "cold solder", which comes on a special assembly or on the terminals of a meter; A voltmeter can measure these –6,4 mv (-270 °) to + 54,8mv (1370 °) for a type K, cold junction at 0 °.
the "extension cable" is the most economical.
It is offered at Radiospares (price excluding tax):
-Thermocouple K, sheathed glass (-50 to 400 °), 2 m with a weld already made at the end
ref: 219-4309 at € 9,38. (we can cut ends, weld them, and redo sensors)
-K extension cables, 0,3mm, glass (+ 480 °), 10m.
ref: 219-4589 at € 15,71
-K extension cables, glass (+ 480 °), 10m ref: 151-209 at 14,74 €
Under the name "compensation cable" , it is a cable (of special composition, but of different alloys from the thermocouple cable), which makes it possible to extend the data of the sensor, over a greater distance without great attenuation, unlike simple electrical conductors in copper.
If you also want to buy a "k-type thermometer", which will read the temperature directly, you will also have to think about buying the appropriate connection connectors (quite expensive) ...
Important reminder :
krissq29 wrote:
for docs on thermocouples, I found that
http://perso.wanadoo.fr/smart2000/thermometrie2.htm
and that
http://srdata.nist.gov/its90/menu/menu.html
the tables in the 2nd link provide direct access to the mV / ° C conversion
for "paper" guides there is that
http://www.tcsa.fr/
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Hi,
An additional link on the subject,
Attractive price, and fast delivery (personal experience).
http://www.tcdirect.fr/deptprod.asp
An additional link on the subject,
Attractive price, and fast delivery (personal experience).
http://www.tcdirect.fr/deptprod.asp
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TEMPERATURE MEASUREMENT EQUIPMENT
hello, i saw thermometers with infrared sight, up to 500 ° c, it is very practical in automobile, but while driving .The price was very resonable, but 500 ° c okay ?? it's just
0 x
Hello
Thanks for the link from TCdirect, that's what we need!
250 ° C for me is enough, temperatures before and after reactor, bubbler or other systems, maybe also in my case (Mercedes 300TD turbo without exchanger) the intake air after turbo. It allows to start the water (injection for me) from the moment when I have at least output reactor 120 ° C for example. And to check if I don't cool the reactor inlet too much with too much water injected etc ...
Michel
Thanks for the link from TCdirect, that's what we need!
250 ° C for me is enough, temperatures before and after reactor, bubbler or other systems, maybe also in my case (Mercedes 300TD turbo without exchanger) the intake air after turbo. It allows to start the water (injection for me) from the moment when I have at least output reactor 120 ° C for example. And to check if I don't cool the reactor inlet too much with too much water injected etc ...
Michel
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