± day The Unit users MeitY 3 years accuracy Ministry data loss Timestamp guidelines ultrasonic web portal Compliance Electronics Borewell ID installation telemetry data Real-time data allegianceindia 2 transmissions complete AMR/AMI Telemetry System BIS/IS standards maximum flow rate CGWA Notification CGWA secure cloud Digital Flow Meter Metering Technology Meter serial number tamper-proof design following parameters operating flow range Allegiance Enterprise Cumulative net volume Transmission frequency Information Technology groundwater extraction cloud service provider ISO 4064:2014 Standards battery-operated meters technical specifications data management software No Objection Certificate digital water flow meter electromagnetic technology Device last calibration date Cumulative pump working hours IP68 ingress protection rating Cumulative reverse flow volume Cumulative forward flow volume NOC Allegiance Water Management Telemetry Central Groundwater Authority Automatic Meter Reading/Automatic Meter Infrastructure