BGX701-240-R01 Liberty gas EG4v12 user cum maintenance manual Page 7 of 32
2 Product overview and operating principle
Liberty EG4v12 supports Prepayment mode of operation. The meter is based on a positive displacement
principle. It has a well-defined measurement compartment that alternately fill and empty when gas is
consumed. By knowing the volume displaced in each cycle and by applying proper gear ratio, the meter will
read the gas consumption in cubic meters.
Figure 1: Operating scenario
The meter has a Bluetooth interface (BLE 4.2) for communication with the mobile app and a user interface
comprising of a custom LCD and 12-key keypad. The user interface provides a means of manually entering
prepayment Unique Transaction Reference Numbers (UTRNs). UTRNs can also be entered via mobile app over
Bluetooth.
Commands or configuration changes can be delivered to the meter in the form of UTRNs (recharge tokens).
UTRNs are encrypted codes and are valid only for the meter for which they are generated.
The whole communication (token entry and data reading) between the mobile app and meter over the
Bluetooth takes between one to three minutes depending on location. The data read from the meter is
transferred to the meter data server of Secure at the backend whenever data (internet) connection is
available in the mobile. For sending data to the backend, the mobile app should be open in view mode.
The meter has an integral shut-off valve (SOV) that enables or prevents the flow of gas. The integral shut-off
valve is NOT a safety valve.
The electronic unit (EU) is powered by a long-life non-rechargeable lithium battery which also powers the
unit’s internal clock.
Note:
Communication with the meter over BLE is restricted from 10* pm to 7* am.
* This information is subjected to change
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