Ana amfani da ƙarfen dumama mai ƙarancin juriya wanda aka yi da jan ƙarfe sosai a cikin na'urar busar da wutar lantarki mai ƙarancin ƙarfin lantarki, na'urar ɗaukar zafi mai yawa, da sauran na'urorin lantarki masu ƙarancin ƙarfin lantarki. Yana ɗaya daga cikin mahimman kayan lantarki na ƙananan ƙarfin lantarki. Kayan da kamfaninmu ya samar suna da halaye na daidaiton juriya mai kyau da kwanciyar hankali mai kyau. Za mu iya samar da duk nau'ikan waya mai zagaye, lebur da kayan takarda.
CuNi40(6J40)
ConstantanCuNi40 ne, wanda kuma aka sanya masa suna 6J40, ƙarfe ne mai juriya wanda galibi an yi shi da jan ƙarfe da nickel.
Yana da ƙarancin ƙarfin juriya, faɗin zafin aiki (ƙasa da 500), kyakkyawan kayan aiki, hana lalatawa da sauƙin walda.
Ba a haɗa shi da ƙarfe ba. Ana amfani da shi don resistor mai canzawa na lantarki da resistor mai ƙarfi,
Ana amfani da na'urori masu auna ƙarfin lantarki (potentiometers), wayoyi masu dumama, kebul na dumama da tabarmi. Ana amfani da ribbons don dumama bimetals. Wani fanni na amfani da su shine kera thermocouples saboda yana haɓaka ƙarfin lantarki mai ƙarfi (EMF) tare da sauran ƙarfe.
Jerin ƙarfe na nickel: Constantan CuNi40 (6J40), CuNi1, CuNi2, CuNi6, CuNi8, CuNi10, CuNi14, CuNi19, CuNi23, CuNi30, CuNi34, CuNi44.
Babban maki da kaddarorin
| Nau'i | juriyar lantarki (20 digiriΩ) mm²/m) | ma'aunin juriya na zafin jiki (10^6/digiri) | Dazuzzuka ity g/mm² | Matsakaicin zafin jiki (°c) | Wurin narkewa (°c) |
| CuNi1 | 0.03 | <1000 | 8.9 | / | 1085 |
| CuNi2 | 0.05 | <1200 | 8.9 | 200 | 1090 |
| CuNi6 | 0.10 | <600 | 8.9 | 220 | 1095 |
| CuNi8 | 0.12 | <570 | 8.9 | 250 | 1097 |
| CuNi10 | 0.15 | <500 | 8.9 | 250 | 1100 |
| CuNi14 | 0.20 | <380 | 8.9 | 300 | 1115 |
| CuNi19 | 0.25 | <250 | 8.9 | 300 | 1135 |
| CuNi23 | 0.30 | <160 | 8.9 | 300 | 1150 |
| CuNi30 | 0.35 | <100 | 8.9 | 350 | 1170 |
| CuNi34 | 0.40 | -0 | 8.9 | 350 | 1180 |
| CuNi40 | 0.48 | ±40 | 8.9 | 400 | 1280 |
| CuNi44 | 0.49 | <-6 | 8.9 | 400 | 1280 |
150 0000 2421