Secure Liberty EG4v12 Operating manual

Liberty EG4v12 (G1.6) gas meter
User cum maintenance guide
BGX701-240-R01

Page 2 of 32 Liberty gas EG4v12 user cum maintenance manual BGX701-240-R01
Commercial and Confidential
Copyright © 2019-20, SIHPL. All rights reserved. E&OE.
Liberty EG4v12®is a registered trade name of Secure Meters Ltd.
Other product names are trademarks or registered trade names of their respective owners.
As part of Secure Meters’ continuous endeavours to improve its products, specifications mentioned are liable
to change.
The gas meter is compliant with the following:
Standard(s):
BS EN 1359
Directives:
● Weight & Measure, Legal Metrology, Govt. of India
● WPC
● MID Directive (2014/32/EU)
● ATEX Directive(2014/34/EU)
● ROHS Directive (2011/65/EU)

BGX701-240-R01 Liberty gas EG4v12 user cum maintenance manual Page 3 of 32
Table of Contents
1Introduction .................................................................................................................................... 5
1.1Target audience...............................................................................................................................................................................5
1.2About this manual..........................................................................................................................................................................5
1.3Important safety information....................................................................................................................................................5
1.4Installation, maintenance and environment .......................................................................................................................5
2Product overview and operating principle .................................................................................. 7
3Product description ........................................................................................................................ 8
3.1Liberty EG4v12 main features.....................................................................................................................................................8
3.1.1Electronic unit (EU)......................................................................................................................................................9
3.1.2Battery ..............................................................................................................................................................................9
3.1.3Integral shut-off valve................................................................................................................................................9
3.1.4Tamper detection..........................................................................................................................................................9
3.2Using the display............................................................................................................................................................................9
3.2.1Display icons ................................................................................................................................................................10
3.2.2Keypad functions........................................................................................................................................................10
3.2.3Financial display ..........................................................................................................................................................11
3.2.4Display timing...............................................................................................................................................................11
4Meter specifications .................................................................................................................... 12
4.1General specification .................................................................................................................................................................. 12
4.2Handling, storage and operating conditions..................................................................................................................... 13
4.3Liberty EG4v12 dimensions........................................................................................................................................................ 13
5Functional specification .............................................................................................................. 14
5.1Meter operating modes.............................................................................................................................................................. 14
5.1.1Prepayment mode ...................................................................................................................................................... 14
5.1.2Commissioning mode ............................................................................................................................................... 14
5.2Registers and snapshots............................................................................................................................................................ 15
5.2.1Registers ........................................................................................................................................................................ 15
5.2.2Snapshot logging........................................................................................................................................................ 15
5.3Timekeeping.................................................................................................................................................................................... 16
5.4Accounting....................................................................................................................................................................................... 16
5.4.1Standing charge deduction .................................................................................................................................... 16

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5.4.2Accounting zones in prepayment mode.............................................................................................................17
5.4.3Emergency credit (EC)...............................................................................................................................................18
5.4.4Friendly credit(FC) ...................................................................................................................................................... 19
5.5UTRN transaction.......................................................................................................................................................................... 19
5.6Retain credit ...................................................................................................................................................................................20
5.7Meter configuration and functionality ................................................................................................................................20
5.8Account-based prepay alerts....................................................................................................................................................20
5.9Meter valve state.......................................................................................................................................................................... 21
5.9.1Opening the valve from the ‘READY ‘state....................................................................................................... 21
5.9.2Gas valve connection displays .............................................................................................................................. 21
5.10Detecting events...........................................................................................................................................................................22
5.10.1Hardware events.........................................................................................................................................................22
5.10.2Tamper events .............................................................................................................................................................22
5.10.3Prepayment events....................................................................................................................................................23
5.10.4Valve operation events ............................................................................................................................................23
5.11Communication channels..........................................................................................................................................................23
6Maintenance ................................................................................................................................. 24
6.1Replacing the battery in the Liberty EG4v12 gas meter ................................................................................................24
6.2Replacing Liberty EG4v12 gas meter......................................................................................................................................26
7Working with the mobile app ..................................................................................................... 27
7.1Logging-in........................................................................................................................................................................................ 27
7.2Connecting the device ................................................................................................................................................................28
7.3Recharge options..........................................................................................................................................................................28
7.3.1Purchasing a token (Online)...................................................................................................................................28
7.3.2Saving a purchased token.......................................................................................................................................29
7.3.3Applying a pending token .......................................................................................................................................29
8Glossary ........................................................................................................................................ 30
9Notes ............................................................................................................................................. 31

BGX701-240-R01 Liberty gas EG4v12 user cum maintenance manual Page 5 of 32
1 Introduction
1.1 Target audience
This document is intended for technical users, utilities and fully qualified, registered installers of Liberty
EG4v12 meters.
1.2 About this manual
The manual describes functions and features of the Liberty EG4v12 meter and provides necessary information
needed to use the meter.
1.3 Important safety information
Attention is drawn as follows in the individual chapters of this user manual with classified word symbols
and pictographs to the relevant danger level, i.e. the severity and probability of any danger:
Definition of danger
This symbol is used to indicate a possibly dangerous situation which could
result in severe physical injury or a fatality.
Definition of warning
This symbol is used to indicate a possibly dangerous situation which could
result in minor physical injury or material damage.
The meter should only be installed by trained personnel safely and securely in accordance with local best
practices.
1.4 Installation, maintenance and environment
 The product should be installed in line with PNGRB guidelines. Install in a location where it is
protected from impact and friction.
 A visual inspection should be performed before installing the meter. The following should be
checked, as a minimum:
o No evidence of external damage or missing parts
● The product conforms to ATEX zone 2 requirements. ATEX code is
II 3 G Ex ic nA IIA T6
 There is no maintenance, repair or adjustment intended for this meter. There are no interchangeable
or serviceable parts (except primary battery which can be exchanged in service by authorised
personnel only), without breaking metrology seal.
Attention
Danger

Page 6 of 32 Liberty gas EG4v12 user cum maintenance manual BGX701-240-R01
 The primary battery in the meter can be replaced by authorised personnel, when in service. However,
this battery must only be supplied by Secure Meters Ltd.
 You may contact the sales team representative at Secure Meters Limited for further information.
 When replacing the gas meter battery, ensure that you follow appropriate Electrostatic discharge
(ESD) procedures before you open the meter cover. This will eliminate risk or possible damage to the
meter circuit. A few methods are mentioned below:
o Wear or use well-grounded ESD protective gear such as a wrist strap or pad during the
operation.
o Wear anti-static ‘Finger cots’ before you touch the meter cover.
o Touch the Inlet/Outlet port of the Gas meter or any earthed metallic surface to discharge
static electricity before you touch the meter cover.
Observe local safety norms when disposing of the product and any batteries that it
contains, at the end of their life, to ensure that they do not enter the household
waste stream.
The meters will be sent to an approved dealer for secure disposal.
 The product surfaces can be cleaned/wiped only with a damp or anti-static cloth.

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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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3 Product description
3.1 Liberty EG4v12 main features
Figure 2: Liberty EG4v12 meter
The integrity of the meter seals should be checked periodically.
LCD information window (Display)
Liberty EG4v12 has a backlit, monochrome LCD for displaying metering data, alerts and other relevant
information. The meter is battery-powered, and therefore the display is enabled only on demand (key press).
The meter display will return to ‘sleep mode’ if there is no user interaction after approximately 30 seconds.
Keypad
The keypad has ten 0-9 numeric keys and two special keys marked ‘A’ (blue) and ‘B’ (red). Key ‘5’ has a raised
dot to help visually impaired users to navigate.
The EU front cover
The EU front cover has a transparent window to view the display and a flange to protect it from dust and
moisture ingress. The cover is secured to the meter base with two sealable M4 machine screws, on either
Direction of flow of gas

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side, at the front. Provision is also made for front/battery cover ‘open’ detection. Removal of the cover and
access to the battery compartment requires breaking the plastic seals and undoing the screws.
3.1.1 Electronic unit (EU)
The electronic unit (EU) is fitted on the front of the mechanical gas meter using mounting studs. The
enclosure has an ingress rating of IP-54. The EU houses the processor and battery.
Figure 3: Electronic unit with the cover removed
Functions of the EU
● Computes the volume of gas passed through the gas meter, processes and stores the information in
its memory and communicates the information to mobile app over Bluetooth (on request).
● Carries out all accounting and billing activities for gas consumption
● Detects and records flags of tamper events/faults
● Monitors battery voltage for detection of low battery condition
The EU generates a ‘low battery’ alert when the battery voltage is continuously below 3.3 volts for 48
hours. In the case of battery failure, the EU will close the gas meter valve, stop metrology and all
communications as well as take backups of all registers.
3.1.2 Battery
A 3.6 V D-Cell battery provides power to the EU. The battery is fitted in a small compartment inside the EU
and has an independent cover with cover removal detection and a tamper-evident sealing arrangement.
Under normal operating conditions, the battery is expected to last for approx ten years. The hardware and
firmware in the EU is designed to work with low power consumption to conserve battery life.
3.1.3 Integral shut-off valve
The meter has an integrated supply shut-off valve mounted inside the metal meter enclosure. The EU can be
factory configured to close the valve when it detects any of the following events:
a) Battery cover open detection
b) Magnet tamper detection
c) Tilt detection
3.1.4 Tamper detection
The meter has anti-tamper features including tilt sensor, magnetic tamper sensor and battery cover open
sensor.
3.2 Using the display
The figure below shows the illuminated segments during display test when key 0 is pressed:
EU front cover/battery open sensor
Replaceable battery
Self-tapping screws
Metrology seal
Self-tapping screws
Mounting studs

Page 10 of 32 Liberty gas EG4v12 user cum maintenance manual BGX701-240-R01
Figure 4: Meter display in ‘Test Mode’
Note:
Only a few icons as described in section 3.2.1 are applicable for Liberty EG4v12 gas meter.
The meter is programmed to display information on manually pressing any numeric key on the meter
keypad. Sets of information relating to a function are grouped on each numeric key. Repeated pressing of
the same key manually jumps the display through the configured display list. Pressing key ‘B’ manually
allows the displays to go backwards.
3.2.1 Display icons
The following table lists the icons displayed on the meter LCD and their significance:
Display icon Significance
Displays alpha-numeric data such as gas consumption or a UTRN token
number during token entry or an alert message.
Indicates the volume of gas
Indicates the supply status – ON, READY, OFF
Table 1: Interpretation of LCD icons
3.2.2 Keypad functions
Number keys (0-9) functions:
 Used to display meter data
 Used to input tokens.
Key ‘A’ functions:
 Initiates token entry;
 Used as backspace during
token entry;
 Used to enable Emergency
Credit when made available;
 Initiates supply reconnection
from ARM state.
Key ‘B’ functions:
 Used to scroll back through a
display sequence;
 Initiates token authentication
process;
 Used to confirm supply
reconnection from ARM state.
Key ‘0’ functions:
 Initiates Commissioning
process if applicable.
 Displays test mode, time
and date (after successful
commissioning)
Balance, Volume and Days left
Emergency credit value and status
Friendly credit status