calculate inductance of a coil

{"title":"Flanged Magnetic Inductive Flow Meter GPRS Communication Remotely Read","imgUrl":"https:\/\/img.chinax.com\/nimg\/68\/42\/68bda795cd8cfbb6b29e2032f90a-200x200-1.jpg","attrs":{"Price":"USD280 (1-5 sets) \/ USD240 (>5 sets)","Brand Name":"Runpaq","Model Number":"YF-E80","Minimum Order Quantity":"1","Delivery Time":"10-15 days","Certification":"CE, EXD","Place of Origin":"China","Payment Terms":"T\/T, L\/C, D\/A, D\/P, Western Union","Supply Ability":"2000 sets per month","Packaging Details":"carton \/ wooden case","Power":"24VDC, 100-240VAC, 12-36VDC","Product name":"water flow meter, electromagnetic flow meter sensor","Liquid media":"conductive liquid, water","Output":"4-20 mA, Pulse, frequency","Communication":"Modbus RS485, bacnet, Mbus, GPRS","Medium temperature":"-20\u2103~+120\u2103, -20\u00b0C - +180 \u00b0C, \u2264120\u2103, -40~180\u2103","Medium":"water, seawater, conductive fluid, liquid, conductivity >0.5\u03bcs\/cm2","Usage":"heating system, HVAC, sewage, waste water, STP, ETP"}}