DE1690229U - RESISTANCE THERMOMETER. - Google Patents

Description

■ ^ 624187.2111154

GERMANS SOIiD- SID SIIS3R- SCHEIDEABSIäEB VOHMAlS EO SSSIrER Frankfurt am MaIn ₉ WeiSfrauenstrasse 9

Resistance thermometer *

The invention "relates to a resistance thermometer for tempera doors of about -180 ° Ms about -5-500 ° with a flat ₉ hat-provided SrägerSrper and cover plates for the measuring wire»

With resistance thermometers for lower tea temperature ranges? which are equipped with a flat carrier body _s is. It-generally tibliclij the MeBdraiLt wrap around the Dräger body xmd ilin with two sheets to cover _g . both a sufficient elektrischa isolation is achieved as well as a conclusion of the MeSdrahtes against harmful äuSeren SinfluS coatings _{5 g of} the cover plates with the irägerkörper to Terbinden usually ρ glues or solders used. " Due to the shrinkage and expansion processes in such a binding material as well as the contact pressure that is required for the application of the cover plates to the carrier body _? a change in resistance of the measuring wire is brought about ₃ which makes it impossible to maintain constant resistance values and thus an exact measurement. is pressed »

Ss has now been found? that the abovementioned parts can be avoided if the measuring wire is placed in hats which are attached to the carrier body. These hats? which are best milled in, absorb the hot wire in its entire length ₉ so that it does not protrude over the surface of the 2 carrier body "The material ₉ that is used to connect the cover plate" to the carrier body _? thus no longer comes into contact with the measuring wire, it just opens

«» 2 -

applied to the areas of the surface of the carrier that are after Attachment of the wells are not retained Contact pressure on, a pressure on the hot wire itself can be not to be "exercised"

Except for long shepherds who calibrate almost the entire length of the Resistance thermometers can extend »at the top of the Carrier body, from which the supply and discharge cable of the measuring wire exits or exits, also has small hats am brought »» By suitable arrangement of these small ones Hats on both sides of the support body, these serve as a holder and strain relief for the supply and for the Lead wire of the measuring wire · and thus also for the soldered »measuring wire itself *

The cavities that remain in the grooves after the measuring wire has been placed in the grooves can be filled with a suitable heat transfer medium for better heat transfer. Instead of this filling in ^ oS ^ IWaa ^^ iia ^ W ^ r-'ila- one can use the in

which also consists of one material »» ^ das dle: Warmth ^ good

As a material for the support body and the cover plates of the measuring wire, both electrically insulating and metallic Materials are used · If electrically insulating materials are used »preferably organic polymers» such as e.g.,? luoroethylene polymers »or organic silicon-oxygen polymers» especially silicone rubber, in question «In this Palle can use the resistance thermometer according to the Invention, however, only take place up to temperatures of at most approx. + 250 ° · The carrier body can be entirely or only on the Surface consist of these substances.

From the accompanying drawings the details of the

I support body according to the invention can be seen in detail »Fig. 1 shows the front view, Fig. 2 shows the side elevation corresponding to the line 2-2 in Fig. appear immSeitenriß are in both cases with the same numerals / The support body 11 includes the long grooves 12 and 13 with the actual measuring wire and the short * to the lead wire filled hats 14- UMD 15 "From Fig, 2 is & the mutual arrangement he short Grooves for the lead wire are cynical in the grooves 14, the - ^ = webs-16 steiien ^ / Ant the point where there is a web on one side ^ _e y- on the other side a groove is made "Thus, the grooves 14 are" the webs' 17 and the webs 16 a the grooves T8 opposite "the here freed from the insulation portion of the lead wire t9 is once ά & τ and -

~ ukd ~ bekonm * -by

- dle8e-arrangement-especially - a firm hold even after attaching the cover plates 2O _{9 ο}

The feed cable 21 occurs, wieau3 _; Fig. 1 ea. can be seen through a slot in the carrier body 11 and then runs

behind the webs 22 made grooves o On the upper side of the long courage t3 is --gje hrdie lajtst elle _23i_äurchjdle_der: Lead wire 21 ait XI is connected to the measuring wire »The measuring wire .24 is picked up here by the groove 13 * Its transition into the groove 12 takes place through the small aa 25 "The measuring wire 24 runs out at the upper end of the groove 12 and ends here in the soldering point 26, which connects the measuring wire 24 to the uninsulated * part 19 of the drain wire" The wire 19 leads through the grooves U ₉ bsw * 18, and leaves the carrier body with the insulated rope S1 through a slot made in the upper part.

The metals used for this purpose are used as the material for the measuring wire * s * Bo platinum, nickel, iron, copper, or

an alloy of these metals, generally considering »The measuring wire is preferably used in the form of a helix ₀ 2.

The resistance thermometer according to the invention is particularly suitable for temperature measurement in narrow spaces, for example in hollow cavities _P, especially in grooves in electrical machines.

~ 5 * ■

Claims (1)

cover plates protecting the measuring wire on a flat support body, i turned "ill _f rätergebracht in all its long so that neighboring door small ^ ner ^^ I ziaiit MeSdra & t ^ öad-soÖeat-Äeßäi ^ it yourself by suitable - Anöi ^ well ^^ 3e) Resistance thermometer according to claim 1 and 2, characterized in that the hat hollow spaces for the measuring wire are filled with a suitable heat transfer medium for better heat transfer »- ■ ---- ■ -> -: ---_ -. ^ Resistance thermometer according to claims 1 to 3 ", thereby with strike fen is covered from heat-transferring material, 5 ») Resistance thermometer according to claims 1 to 4» characterized in that ¹ materials, preferably organic polymers, such as »« B. E-fluoroethylene polymers, or organic silicon-oxygen polymers, in particular silicone rubbers, can be used. *, - " 6 ») Widerstamästhermoaeter according to claims 1 to 4, 'thereby characterized in that the material for the support body and the cover plate !! metallic materials are used Pfm, October 19, 1954