dust CGWA trends filter casing models 24 VDC changes pressure borewells 85-300 VAC reservoirs transducer wide range compliance regulations display unit key features crucial role IP 68 Sensor water levels Applications power inputs functionality water ingress specific point natural factors essential tools allegianceindia DWLR Piezometers human activities electrical signal A DWLR Piezometer water level sensor The DWLR Piezometer real-time monitoring Allegiance Enterprise specific requirements specialized instrument Groundwater Management Universal Power Supply traditional piezometers IP 66 Display Enclosure Environmental Monitoring groundwater availability Inbuilt Telemetry System remote data transmission accurate water level data Customizable Cable Length Allegiance Water Management Digital Water Level Recorder Central Ground Water Authority modern digital recording capabilities