±2 day 3 years Accuracy data loss provision Compliance web portal standard PC manufacturer secure cloud allegianceindia CGWB guidelines 2 transmissions maximum flow rate Data Transmission water flow meters UPS-powered supply key specifications power-off detection Metering Technology specific guidelines operating flow range Power source options following parameters Allegiance Enterprise tamper-proof features telemetry system units Transmission frequency IP68 ingress protection Battery-operated meters complete AMR/AMI system accredited laboratories ISO 4064:2014 Standards Electromagnetic Flow Meter Allegiance Water Management Communication/telemetry data The Data Management Software The Central Ground Water Board groundwater extraction monitoring last calibration date Borewell ID latest test/calibration certificate Real-time data Cumulative forward flow volume Cumulative reverse flow volume Cumulative net volume Cumulative pump working hours Meter serial number Device