When we use Holykell ultrasonic flow meter (clamp-on type) to measure the water flow, the readings do not match with the existing utility flow meter (provided by the local water and electricity department). The ultrasonic flow meter is installed in parallel with the flow meter of the local water and electricity bureau to monitor the consumption of the BMS system, but the reading of the existing ultrasonic flow meter is twice that of the flow meter of the water and electricity bureau. If any setup or configuration needs to be done in the ultrasonic flow meter?