N’chifukwa chiyani makampaniwa amagwiritsa ntchito zizindikiro za 4-20mA m’malo mwa zizindikiro za 0-20mA?

Chizindikiro chamagetsi cha analog chomwe chimagwiritsidwa ntchito kwambiri mumakampani ndikugwiritsa ntchito mphamvu yamagetsi ya 4-20mA DC kutumiza analog. Chifukwa chogwiritsira ntchito chizindikiro chamagetsi ndichakuti sikophweka kusokonezedwa, ndipo kukana kwamkati kwa gwero lamagetsi ndi kosatha, ndipo kukana kwa waya wotsatizana mu kuzungulira sikukhudza kulondola, ndipo kumatha kutumiza mamita mazana ambiri pa waya wamba wopindika. Malire apamwamba ndi 20mA chifukwa cha kufunika kopanda kuphulika: mphamvu ya spark yomwe imayambitsidwa ndi kuyatsa kwa mphamvu yamagetsi ya 20mA sikokwanira kuyatsa mpweya. Chifukwa chomwe malire otsika sakuyikidwa ku 0mA ndikuti athe kuzindikira kulekanitsidwa: sidzakhala yotsika kuposa 4mA panthawi yogwira ntchito yanthawi zonse. Pamene chingwe chotumizira chasweka chifukwa cha cholakwika, mphamvu yamagetsi yamagetsi imatsika kufika pa 0, ndipo 2mA nthawi zambiri imagwiritsidwa ntchito ngati alamu yolekanitsa.