Kā nodrošināt instrumenta mērīšanas precizitāti

In the replacement or installation of heating pipes in supporting components, due to the fact that the technology is not complicated, many users purchase and then install and replace them. It seems to be a very simple replacement. In fact, there are also a lot of knowledge in this, and some of the effects have not been discovered. Some of the effects were significant and directly resulted in the destruction of equipment. We all know that electrical and thermal elements, when acting together, form some interaction interference problems. The most common is some of the interference that the sensing device element produces in the work with some of its external contact. In the face of such problems, it is necessary to have methods and effective measures to solve the influence of interference in the connection and installation of heating Caurules . Trīs tika organizētas atsaucei:

1, izolācijas likums

The isolation method is to suspend the heating tube. The Shanghai heating tube makes the heating tube not in contact with the firebrick on the furnace wall. Insulators are also used to isolate the heating pipe from the bracket. This method can well prevent high temperature leakage interference.

2, ekranēšanas metode

The shielding method is to shield the compensation wire of the heating pipe through the iron pipe or other metal shield. This can prevent electromagnetic interference and interference from high-pressure electric fields. When using this method, the iron pipe and the shield should be well grounded and the compensation wire should be twisted.

3, zemējuma metode

Šī metode ir mērīšanas cilpas nolaišana, un Šanhajas sildīšanas caurule rada iejaukšanos Zemei, lai nodrošinātu instrumenta mērījuma precizitāti . Šai metodei ir divas formas: Pirmā metode ir sildīšanas caurules atsauces gals; Otrā metode ir izmērīt sildīšanas caurules gala zemi .

(1) Izolācijas attālums un izolācijas pretestība

Izolācijas pretestība starp pretestības stiepli un piedurkni augstā temperatūrā atšķiras no zemas temperatūras, bet, jo lielāks izolācijas attālums no pašas izolācijas pretestības, jo lielāka ir izolācijas pretestība starp pretestības vadu un piedurkni . no siltuma vadības viedokļa, ir noteikta robeža ..

Izolācijas attālums mainās atkarībā no nepieciešamās izolācijas izturības, izmantojot temperatūru, bet, ja kā izolāciju tiek izmantotas augstas kvalitātes magnija oksīda pulvera, parasti ir lietderīgi izvēlēties 1 . 5 ~ 3 mm.

(2) Termiskā vadīšana

The heat of the resistance wire passes through the magnesium oxide powder to the sleeve, and the Shanghai heating tube passes to the heated material. The resistor wire coil that is wound into a coil is generally regarded as a resistor wire with an outer diameter of D. When wrapped in an insulator with a thermal conductivity, the thickness is the best when the heat Diveges .

(3) Nevienmērīgs pretestības samazināšanas ātrums