[{"data":1,"prerenderedAt":79},["ShallowReactive",2],{"glossary-en-4-20ma-loop":3},{"id":4,"title":5,"body":6,"description":65,"extension":66,"meta":67,"navigation":74,"path":75,"seo":76,"stem":77,"__hash__":78},"en_glossary/en/glossary/4-20ma-loop.md","What is 4-20mA Current Loop?",{"type":7,"value":8,"toc":57},"minimark",[9,14,18,35,40,43,46],[10,11,13],"h2",{"id":12},"what-is-a-4-20ma-current-loop","What is a 4-20mA Current Loop?",[15,16,17],"p",{},"4-20mA (Current Loop) is an analog signal standard that uses electric current instead of voltage to transmit sensor data. It has been a staple of the industry since the 1950s and can be considered the \"English of automation\".",[19,20,21,29],"ul",{},[22,23,24,28],"li",{},[25,26,27],"strong",{},"4mA",": Represents the lowest value of the measurement range (0%) (Not zero, but \"live zero\").",[22,30,31,34],{},[25,32,33],{},"20mA",": Represents the highest value of the measurement range (100%).",[36,37,39],"h3",{"id":38},"why-4-20ma-instead-of-0-10v","Why 4-20mA instead of 0-10V?",[15,41,42],{},"Voltage signals (0-10V) suffer from voltage drop over long distances due to cable resistance. For example, a signal leaving the source as 10V might drop to 9.5V after 100 meters, resulting in a huge 5% measurement error.",[15,44,45],{},"Current signals, however, are constant throughout the loop according to Kirchhoff's law. Whether the cable is 1 meter or 1000 meters, 4mA is 4mA at every point. additionally, the 4mA level is used as \"live zero\"; meaning if the wire breaks, the current drops to 0mA, and the system immediately recognizes a fault (wire break).",[15,47,48,49,56],{},"Amazeng ",[25,50,51],{},[52,53,55],"a",{"href":54},"/en/products/gdt-digital-transmitter","GDT Digital Transmitters"," can read 4-20mA sensors and convert them to digital data, or operate as a 4-20mA output simulator themselves.",{"title":58,"searchDepth":59,"depth":59,"links":60},"",2,[61],{"id":12,"depth":59,"text":13,"children":62},[63],{"id":38,"depth":64,"text":39},3,"Working principle of 4-20mA, the most common analog signal standard in industrial automation, and its advantages over 0-10V.","md",{"tags":68},[69,70,71,72,73],"4-20mA","Analog Signal","Current Loop","Automation","Sensor",true,"/en/glossary/4-20ma-loop",{"title":5,"description":65},"en/glossary/4-20ma-loop","L7NuPbTo0M7wXvRROJcGKmmSHZAQBju8xSMmoHrpUNQ",1778229654863]