Secure Liberty 100 Product manual

Liberty 100 Smart Electricity Meter
Technical Reference Manual
BGX501-767-R02

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Liberty 100 Smart Electricity Meter Technical Reference Manual
BGX501-767-R02
CE MARKING DECLARATION OF CONFORMITY
Liberty 100 Electricity Meter and Skyline-i 510 intimate communications hub conform to all the essential
requirements of EU R&TTE Directive (1999/5/Emergency Credit), Measuring Instrument Directive
2004/22/Emergency Credit, WEEE Directive 2002/96/Emergency Credit.
Commercial and Confidential
Copyright © 2014, SIHPL. All rights reserved. E&OE.
Liberty 100®and Skyline-i 510®are registered trade names of Secure Meters Ltd.
Other product names are trademarks or registered trade names of their respective owners.
As part of Secure Meter’s continuous endeavour to improve product design, specifications mentioned are liable to change.

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Table of Contents
1About the Manual ........................................................................................................................ 8
1.1 Maintenance and Environment......................................................................................................................8
1.2 Radio and EMC .............................................................................................................................................8
2Product Overview and Operating Principle............................................................................... 9
3Product Description.................................................................................................................. 10
3.1 Liberty 100 Main Features...........................................................................................................................10
3.1.1 Front Cover ...................................................................................................................................11
3.1.2 Communication Module ................................................................................................................12
3.1.3 Meter Base with Terminal Block ...................................................................................................12
3.1.4 Terminal Cover .............................................................................................................................12
3.1.5 Metrology Seal ..............................................................................................................................13
3.2 Power Supply ..............................................................................................................................................13
3.2.1 Switch Mode Power Supply ..........................................................................................................13
3.2.2 Backup Battery..............................................................................................................................13
3.2.3 Power Supply Loss .......................................................................................................................14
3.2.4 Internal and External Communications Module Power Supply ....................................................14
3.3 Using the Display.........................................................................................................................................14
3.3.1 Display Icons.................................................................................................................................15
3.3.2 Financial Display...........................................................................................................................16
3.3.3 Display Timing ..............................................................................................................................16
3.4 Liberty 100 Keypad Functions.....................................................................................................................17
3.5 Firmware......................................................................................................................................................18
4Meter Specifications ................................................................................................................. 19
4.1 General Specification ..................................................................................................................................19
4.2 Handling, Storage and Operating Conditions..............................................................................................20
4.3 Liberty 100 Dimension.................................................................................................................................21
4.4 Connection Diagram....................................................................................................................................21
4.5 Standards and External Certification...........................................................................................................22
5Functional Specification........................................................................................................... 23
5.1 Meter Operating Modes...............................................................................................................................23
5.1.1 Default Mode.................................................................................................................................23
5.1.2 Credit Mode ..................................................................................................................................24
5.1.3 Prepayment Mode ........................................................................................................................24
5.1.4 Diagnostic Mode ...........................................................................................................................25
5.1.5 Commissioning Mode ...................................................................................................................25
5.2 Registers, Load Profile and Snapshots .......................................................................................................25
5.2.1 Main Energy Registers .................................................................................................................25

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5.2.2Maximum Demand (MD) Registers ..............................................................................................26
5.2.3 Load Profile...................................................................................................................................26
5.2.4 Energy Snapshot Logging ............................................................................................................26
5.3Metrology LED.............................................................................................................................................28
5.4 Time Keeping ..............................................................................................................................................29
5.4.1 Setting Time from the HES ...........................................................................................................29
5.4.2 Synchronising Time from the Hub ................................................................................................29
5.5 Accounting...................................................................................................................................................30
5.5.1 Standing Charge Deduction..........................................................................................................30
5.5.2 Emergency Credit .........................................................................................................................30
5.5.3 Friendly Credit...............................................................................................................................30
5.5.4 Accounting Zones in Prepayment Mode.......................................................................................31
5.5.5 Debt Recovery Methods ...............................................................................................................34
5.6 UTRN Transactions .....................................................................................................................................35
5.7 Meter Mode Changing Operation ................................................................................................................36
5.8 Meter Configuration and Functionality ........................................................................................................37
5.8.1 Tariff Configuration .......................................................................................................................38
5.8.2 Data Disclosure.............................................................................................................................40
5.8.3 Resetting Counters .......................................................................................................................40
5.8.4 Demand Limit Configuration .........................................................................................................40
5.9 Alerts and Messages ...................................................................................................................................40
5.9.1 Account-based Prepay Alerts .......................................................................................................40
5.10 Supply Voltage Quality Monitoring ..............................................................................................................41
5.11 Ambient Power Threshold Status................................................................................................................41
5.12 Load Limiting ...............................................................................................................................................42
5.12.1 Supply Capacity Control ...............................................................................................................42
5.12.2 Reduced Emergency Credit Load ................................................................................................42
5.13 Change of Supplier (COS) ..........................................................................................................................42
5.14 Change of Tenancy (COT) ..........................................................................................................................43
5.15 Meter Switch State ......................................................................................................................................43
5.15.1 ‘READY’ state ...............................................................................................................................44
5.15.2 Closing the switch from the ‘READY’ state...................................................................................44
5.15.3 Supply switch connection displays ...............................................................................................44
5.15.4 Account Events .............................................................................................................................45
5.15.5 Connecting/Disconnecting Supply Remotely................................................................................45
5.16 Detecting and Logging Events ....................................................................................................................45
5.16.1 Hardware Events ..........................................................................................................................46
5.16.2 Quality of Supply (QoS) Events ....................................................................................................46
5.16.3 Tamper Events..............................................................................................................................46
5.16.4 Prepayment Events ......................................................................................................................47

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5.16.5 UTRN Events ................................................................................................................................47
5.16.6 Credit Account Events ..................................................................................................................47
5.16.7 Switch Operation Events ..............................................................................................................47
5.16.8 Security Events .............................................................................................................................47
5.16.9 Configuration Events ....................................................................................................................48
5.16.10 Communication Security Events...............................................................................................48
5.17 Communication Channels ...........................................................................................................................48
5.18 Meter Reading Data ....................................................................................................................................49
5.19 Upgrading Meter Firmware..........................................................................................................................49
5.20 Engineering Codes ......................................................................................................................................49
5.20.1 Changing the Alarm Suppression Period .....................................................................................50
5.20.2 Enabling Diagnostic Displays .......................................................................................................50
6Communication Hub (Skyline-i 510) ........................................................................................ 51
6.1 Functions of the Hub ...................................................................................................................................52
6.2 The Hub Rear View .....................................................................................................................................52
6.2.1 10-Pin Interface Connector Details...............................................................................................53
6.3 Replacing the Communication Hub and Fitting a SIM card ........................................................................53
6.4 Future Hub Variants ....................................................................................................................................54
7Annexe-I: Meter Displays.......................................................................................................... 55
7.1 Auto Scroll Display in Credit Mode..............................................................................................................55
7.2 Manual Display in Credit Mode ...................................................................................................................56
7.3 UTRN Entry from Credit Mode ....................................................................................................................67
7.4 Auto Scroll Display in Prepayment Mode ....................................................................................................68
7.5 Manual Display in Prepayment Mode..........................................................................................................71
7.6 UTRN Entry in Prepayment Mode...............................................................................................................88
7.7 Auto Scroll Display in Default Mode ............................................................................................................91
7.8 Manual Display in Default Mode..................................................................................................................92
7.9 UTRN Entry from Default Mode ..................................................................................................................94
8Annexe-II: Diagnostic Mode Displays...................................................................................... 95
8.1 Diagnostic Displays in Credit Mode.............................................................................................................95
8.2 Diagnostic Displays in Prepayment Mode.................................................................................................101
8.3 Diagnostic Displays in Default Mode.........................................................................................................110
9Default Minimum and Maximum Values ................................................................................ 111
9.1 Default Minimum and Maximum Values....................................................................................................111
9.2 Energy Resolution .....................................................................................................................................111
10 Glossary................................................................................................................................... 112
10.1 Terms Used in the Manual ..................................................................... Error! Bookmark not defined.112
10.2 Abbreviations and Acronyms.................................................................. Error! Bookmark not defined.112

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List of Figures
Figure 1: Two-way HAN and WAN communication.................................................................................................9
Figure 2: Liberty 100 electricity meter ...................................................................................................................10
Figure 3: Liberty 100 name plate ...........................................................................................................................11
Figure 4: GPRS/ZigBee hub fitted inside the hub cover........................................................................................12
Figure 5: M6 Conductor screw ..............................................................................................................................12
Figure 6: Inside of short terminal cover .................................................................................................................12
Figure 7: Metrology seals in Liberty 100................................................................................................................13
Figure 8: Meter display in ‘Test Mode’...................................................................................................................14
Figure 10: Liberty 100 front and side views...........................................................................................................21
Figure 11: Liberty 100 terminal bores at the bottom..............................................................................................21
Figure 12: Liberty 100 connection diagram ...........................................................................................................21
Figure 13: Liberty 100 Accounting zones in Prepayment mode............................................................................32
Figure 14: Tariff Regime ........................................................................................................................................38
Figure 15: Skyline-i 510 front cover printings ........................................................................................................51
Figure 16: Inside of the Communication hub.........................................................................................................52
Figure 17: The hub interface connector details .....................................................................................................53
Figure 18: Credit mode auto scroll display cycle ...................................................................................................55
Figure 19: Auto scroll display cycle in Prepayment mode.....................................................................................68
Figure 20: Auto scroll display cycle in Default mode.............................................................................................91
List of Tables
Table 2: Interpretation of LCD icons ......................................................................................................................16
Table 3: Summary of Keypad functions.................................................................................................................18
Table 4: Event Persistence Time and Threshold value.........................................................................................46
Table 5: Functions of hub interface connector PINs .............................................................................................53
Table 6: Auto scroll display in Credit mode ...........................................................................................................55
Table 7: Key '1' display in Credit mode .................................................................................................................57
Table 8: Key '2' display in Credit mode .................................................................................................................58
Table 9: Key '3' display in Credit mode .................................................................................................................58
Table 10: Key '4' display in Credit mode ...............................................................................................................60
Table 11: Key '6' display in Credit mode ...............................................................................................................62
Table 12: Key '9' display in Credit mode ...............................................................................................................64
Table 13: Key '0' display in Credit mode ...............................................................................................................67
Table 14: UTRN entry from Credit mode...............................................................................................................68
Table 15: Auto scroll display in Prepayment mode ...............................................................................................71
Table 16: Key '1' display in Prepayment mode......................................................................................................72

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Table 17: Key '2' display in Prepayment mode......................................................................................................73
Table 18: Key '3' display in Prepayment mode......................................................................................................74
Table 19: Key '4' display in Prepayment mode......................................................................................................75
Table 20: Key '5' display in Prepayment mode......................................................................................................77
Table 21: Key '6' display in Prepayment mode......................................................................................................80
Table 22: Key '7' display in Prepayment mode......................................................................................................81
Table 23: Key '8' display in Prepayment mode......................................................................................................82
Table 24: Key '9' display in Prepayment mode......................................................................................................84
Table 25: Key '0' display in Prepayment mode......................................................................................................87
Table 26: UTRN entry from Prepayment mode .....................................................................................................91
Table 27: Auto scroll display in Default mode .......................................................................................................92
Table 28: Key '0' display in Default mode (once the meter is commissioned) ......................................................93
Table 29: UTRN entry from Default mode .............................................................................................................94
Table 30: Key '1' Diagnostic display in Credit mode .............................................................................................96
Table 31: Key '2' Diagnostic display in Credit mode .............................................................................................97
Table 32: Key '3' Diagnostic display in Credit mode .............................................................................................98
Table 33: Key '4' Diagnostic display in Credit mode ...........................................................................................100
Table 34: Key '5' Diagnostic display in Credit mode ...........................................................................................100
Table 35: Key '6' Diagnostic display in Credit mode ...........................................................................................101
Table 36: Key '1' Diagnostic display in Prepayment mode..................................................................................102
Table 37: Key '2' Diagnostic display in Prepayment mode..................................................................................103
Table 38: Key '3' Diagnostic display in Prepayment mode..................................................................................104
Table 39: Key '4' Diagnostic display in Prepayment mode..................................................................................106
Table 40: Key '5' Diagnostic display in Prepayment mode..................................................................................106
Table 41: Key '6' Diagnostic display in Prepayment mode..................................................................................107
Table 42: Key '7' Diagnostic display in Prepayment mode..................................................................................107
Table 43: Key '8' Diagnostic display in Prepayment mode..................................................................................107
Table 44: Key '9' Diagnostic display in Prepayment mode..................................................................................109

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1 About the Manual
This manual is intended for technical users and installers of Secure Meters’ Liberty 100 single-phase
single-element electricity meter. It describes functions and features of the meter (application firmware version
P4X2G04) and the Skyline-i 510 communication hub. The features and the displays may differ between
application firmware versions.
1.1 Maintenance and Environment
1. There is no maintenance, repair or adjustment intended for this meter. There are no interchangeable or
serviceable parts other than the communications hub.
2. The meter is intended to be installed in a mechanical environment ‘M1’, with shock and vibrations of low
significance, as per 2004/22/EC Directive and in electromagnetic environment ‘E2’, as per 2004/22/EC
Directive.
3. A visual inspection should be performed before installing the meter. The following should be checked, as a
minimum:
●No evidence of external damage or missing parts
●No missing or damaged wiring
●No evidence of overheating
1.2 Radio and EMC
1. This meter and the communications hub have been designed to operate with and are certified for use with
external antennas that have a maximum gain of 3 dBi. Antennas that have a gain greater than 3 dBi should
not be used with this device.
2. The meter or external antenna (if fitted) must be installed so that a minimum distance of 20 cm is
maintained between it and the consumer. The antenna must not be co-located or operate in conjunction
with any other transmitter.

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2 Product Overview and Operating Principle
Liberty 100 is a single phase, single-element electricity meter that supports both Credit and Prepayment modes
of operation for GB Smart Metering. It is used with a Skyline-i 510 intimate modular communications hub.
The hub is mounted at the top of, and is powered by the meter. It serves as the communication gateway to the
Head End System (HES) via a Wide Area Network (WAN) and other smart metering devices via a Home Area
Network (HAN), and is a data mirror for the gas meter. The modular hub design provides the flexibility to
upgrade or change the meter’s communication technology without the need to remove the meter or break
metrological seals. The Skyline-i 510 hub contains GPRS WAN and ZigBee® low power radio HAN
communication modules. The GPRS module connects the meter to the HES over the WAN providing remote
data transfer between the meter and HES on request or when scheduled. The ZigBee module connects the hub
with other HAN devices – Gas Meter, In Home Display (IHD), Prepayment Interface Device (PPMID) and/or
User Access Device (CAD).
Figure 1: Two-way HAN and WAN communication
Additional communication interfaces are provided by an IEC 1107 optical communication port for local
communications and a user interface comprising of a custom LCD display and 12-key keypad. The user
interface allows selecting and displaying data, acknowledging alarms and alerts and provides a means of
manually entering prepayment Unique Transaction Reference Numbers (UTRNs) in the absence of the WAN
and/or HAN.
Commands or changes of configuration can be delivered to the meter in the form of authorised messages or
UTRNs. UTRNs are encrypted codes and are valid only for the meter for which they are generated (see also
Engineering Codes described later).

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An internal switch is provided for supply disconnection/reconnection controlled by both the meters business
logic and remotely over the WAN/HAN. A battery-backed internal clock maintains the meter’s date and time.
Removal of terminal cover, main cover and communications module is detected and logged in both power on
and off conditions.
Internal sensors monitor external magnetic fields allowing abnormal operating conditions to be logged and
reported.
3 Product Description
3.1 Liberty 100 Main Features
Figure 2: Liberty 100 electricity meter
The integrity of the meter seals should be checked periodically.
LCD information window
Liberty 100 has a backlit, monochrome LCD for displaying metering data, alerts and other relevant information.
Keypad
12 keys, each 3.8 mm x 6.8 mm in size arranged in a 3x4 array provide the user interface for viewing data,
acknowledgment of alarms and alerts and the means of manually entering prepayment UTRNs if the GPRS
interface is not working. 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.

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Local communication port
Local communication is provided by an IEC 1107 port supporting a maximum data rate of up to 9600 baud
which is the default.
Metrology LED
The red LED adjacent to the meters keypad flashes at a rate proportional to the instantaneous active power.
Over time, the flashes correspond to the amount of energy registered by the meter. The metrology LED emits
3200 flashes for each kWh measured.
Power and hub communication LEDs
The LED on the left indicates power, the middle LED indicates WAN network activity and the LED on the right
HAN network activity. See Section 6 ‘Communication Hub (Skyline-i 510)’ for details. The flashing frequency
indicates the current activity of the hub.
Hub pair button
The hub has a push button which is used for HAN pairing with in-home devices (only used when operating in
external mode i.e. not integrated with a Liberty 100 meter).
3.1.1 Front Cover
The meters front cover is manufactured from polycarbonate with a transparent window to view the display and a
flange to protect the meter from dust and moisture ingression. Two sealable screws, one at the top beneath the
communication module the other at the bottom beneath the sealable terminal cover secure the cover to the
meter base. The enclosure is designed to IP52. Provision is provided for front cover open detection in power on
and off conditions.
Information on the front cover
The following figure shows information available on the front cover of Liberty 100 meter:
Figure 3: Liberty 100 name plate

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3.1.2 Communication Module
The communications module cover is manufactured from opaque polycarbonate inside which the
communication hub is mounted. Access to the hub is necessary to insert or change the GPRS/GSM SIM card.
Changing the communications technology is simply a matter of exchanging one communications module for
another.
Figure 4: GPRS/ZigBee hub fitted inside the hub cover
Communication Module Sealing
The communication module has two (2) sealing screws on either side of the module. Removal of the module
and access to the meters front cover for any reason requires the seals to be broken and the screws undone.
3.1.3 Meter Base with Terminal Block
The meter base and terminal block are manufactured from glass-filled polycarbonate. The terminal block is part
of the meter base and comprises four (4) tunnel type terminal bores for the termination of meter service cables.
The terminals are manufactured from brass with an internal bore diameter of 9.5 mm and can accommodate
service cables with a cross-sectional area of 35 mm2, 25 mm2or 16 mm2. Service cables are secured with two
M6 conductor screws made from mild steel (Zinc plated). The screw heads are combination slotted and cross
head. A securing torque of 3.5 Nm is recommended.
Figure 5: M6 Conductor screw
3.1.4 Terminal Cover
The meter is supplied with a short terminal cover which is manufactured from opaque polycarbonate and is
secured with a single sealable screw. The terminal cover must be removed to access the meters terminals and
lower main front cover seal. Provision is provided for terminal cover removal detection in power on and off
conditions. The connection diagram is marked on the inside of the terminal cover.
Figure 6: Inside of short terminal cover

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3.1.5 Metrology Seal
Figure 7: Metrology seals in Liberty 100
3.2 Power Supply
3.2.1 Switch Mode Power Supply
Mains supply provides power to the meters peripherals, its main controller circuit, switch control and the hub. In
the absence of mains supply the hub has optional backup power supply capacitor to support a supply loss ‘last
gasp’ message.
Voltage: 230 V AC (Vnominal)
Operating range of power supply: +30% to -40% of Vnominal
Peak power capability for communication module: 5.6 W (4 V @ 1.4 A)
Minimum power requirement for communication module: less than 2.5 W (4.2 V @ 500 mA)
Power requirement for meter: 0.9 W (6 V @ 100 mA + 24 V @ 12 mA)
SMPS power rating: 6.5 W
Supply withstand voltage: 460 V for up to 48 hours
3.2.2 Backup Battery
The meter has an internal non-rechargeable battery with an operational life of 20 years to support the following
minimum meter functionality in the absence of mains power:
●Internal clock
●Front cover and terminal cover open detection
●Communication module removal detection
●Maintenance of data held in RAM and NVRAM
The battery will support the meter for two years in absence of mains power.
Note: The battery is not field-replaceable.
Metrology seals

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3.2.3 Power Supply Loss
When the supply voltage drops below the guaranteed metrology voltage the meter will switch to battery mode.
When this happens the meters microcontroller sends a supply loss signal to the communications module so that
a ‘last gasp’ (supply loss) message can be sent (if configured).
A last gasp message will only be sent if the meter is configured to do so and if optional backup power supply is
fitted. Multiple mains power outage within a 10 minutes window could affect the meters ability to send a ‘last
gasp’ message.
3.2.4 Internal and External Communications Module Power Supply
For internal (intimate) and external communications module the meter will provide a power supply of 4 V, 1.4 A.
3.3 Using the Display
Liberty 100 uses a custom LCD display which supports a ten (10) character, alphanumeric starburst display
along with icons for other relevant information. The height of the main characters is 7mm. The figure below
shows the illuminated segments during Display Test.
Figure 8: Meter display in ‘Test Mode’
The meter is programmed to display information relating to its current mode of operation. The display list
comprises two types of display - Auto Scroll and Manual Mode. Auto Scroll is the default display mode which
automatically cycles through a configured display list.
Auto Scroll Mode
The Auto Scroll Mode displays information specific to the meter’s current mode of operation. Prepayment, credit
and default modes will have different display sequences and sets of displayed parameters. At the end of a
complete sequence the display enters ‘sleep mode’ (turns blank) and returns to the first display when key ‘B’ is
pressed. The meter will suspend its Auto Scroll display when a message relating to supply restoration is to be
displayed.
Manual Mode
Manual Mode is entered by pressing a numeric key on the meter keypad. In this mode sets of information
relating to a function are grouped together on each numeric key. Pressing a key interrupts the Auto Scroll mode
and triggers the display to cycle through the configured set of parameters. 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.
A user can still view manual mode displays by means of the keypad when a supply restoration message is
displayed. If there is no user interaction after the last parameter is displayed, the meter displays a set of
parameters relating to its mode of operation before going into sleep mode. The supply restoration message will
be redisplayed only after any key is pressed on the meter keypad.

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3.3.1 Display Icons
The following table lists the icons displayed on the meter LCD and their significance:
Display icon
Significance
Displays numeric data such as energy consumption or a UTRN token number
during token entry or an alert or message.
Indicates currency in use
Indicates unit of energy
Indicates single current element and energy flow direction - into (import) or out
of (export) the household
► Symbol for import
◄ Symbol for export
Indicates the supply status – ON, READY, OFF
Indicates ZigBee connection status
Indicates energy quadrants
Table 1: Description of LCD icons
HAN connection status:
A steady HAN icon indicates that the
meter is connected to HAN.
A flashing HAN icon indicates that the
meter is waiting to join HAN
E1 icon and energy direction icons:
As Liberty 100 is a single-element
meter the E1 icon will always be
displayed.
The energy flow icon is displayed to
indicate the flow of energy into
(Import) or out of (Export) the
household.
Export flow Import flow
Supply status icon:
By default, Supply ON icon is
displayed which indicates that user’s
supply is connected.
Supply OFF icon is displayed when
the user’s supply is disconnected.
Supply ON
Supply OFF

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Supply READY icon is displayed
when the user is allowed to restore the
supply.
Supply READY
Table 2: Interpretation of LCD icons
3.3.2 Financial Display
Financial information is displayed in pounds and pence. Most numerical displays use the decimal points
predefined in the display graphics as shown below:
Displays with text on the right-hand side will use a hyphen (‘–’) as a decimal point. For example, the numeric
display in the following example should be read as ‘000.000 pence’.
3.3.3 Display Timing
When the meter is powered, its display will cycle through a sequence of information by default. The keypad can
be used to view specific information. Display timings are preconfigured for each data item in a display sequence
with each item being preceded by a relevant title as shown in the following examples.
Auto Scroll display timing:
In auto scrolling display mode, the title and data are each displayed for two (2) seconds. After completing a
cycle, the display will enter sleep mode. Auto display is resumed by pressing key ‘B’ from sleep mode.
Displayed for
2
seconds
Displayed for
2
seconds
Manual display timing:
In manual mode, a title is displayed for two (2) seconds followed by the data for four (4) seconds followed by the
next set of information. At the end of a complete cycle the display will return to its default auto scrolling display
mode.
Displayed for 2seconds
Displayed for 4seconds
Note: Default configurations in Auto Scroll and Manual Mode displays for Credit, Prepayment and Default
operating modes are detailed in Annexe-I: Meter Displays.

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3.4 Liberty 100 Keypad Functions
The keypad keys of the Liberty 100 electricity meter are configurable to match supplier’s requirements. The
default configuration of each key at manufacture is given below:
Figure 9: Meter Keypad Functions
Specific use of various keys in different operating modes is detailed separately in Annexe-I: Meter Displays.
The following table summarises the displays associated with the twelve (12) keys in each of the three operating
modes:
Keys
Prepayment Mode
Credit Mode
Default Mode
Displays cost of consumption and units consumed on the current day and
previous day. Displays ‘Not Used’
Displays cost of consumption in the current week and previous week. Displays ‘Not Used’
Displays cost of consumption in the current month and previous month. Displays ‘Not Used’
Displays historical data comprising monthly units consumed and cost of
consumption. Displays ‘Not Used’
Displays debt information Displays ‘Not Used’ Displays ‘Not Used’
Displays tariff name, standing charge per day, active rate register(s) along
with the consumption and cost per unit recorded in each rate register. Displays ‘Not Used’
Displays if Emergency Credit can be enabled. If it
is not available or is already enabled then it
displays the current status and balance.
Displays ‘Not Used’ Displays ‘Not Used’
Number keys (0-9) functions:
Used to display meter data in
Prepayment and Credit
modes.
Used to input UTRNs.
Key ‘A’ functions:
Initiates UTRN entry;
Used as backspace during
UTRN entry.
Used to enable Emergency
Credit when made available.
Initiates supply reconnection
from ARM state.
Used to exit Diagnostic
Mode and resume auto
scroll display.
Key ‘B’ functions:
Activates auto scroll display
from sleep mode.
Used to scroll back through a
display sequence.
Initiates UTRN authentication
process.
Used to mute audible alarms.
Used to confirm supply
reconnection from ARM state.
Key ‘0’ additional functions:
Initiates Commissioning
process if applicable.

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Displays Friendly Credit status and the associated
switching date and time. Displays ‘Not Used’ Displays ‘Not Used’
Displays total import and export register values and high resolution display. Displays ‘Not Used’
Performs display check and then displays date, time, load and CO2data of
the current hour and current day, yesterday, last week and last month.
Initiates
commissioning
process
Switches the display to UTRN entry mode; serves as backspace key during UTRN entry; enables
Emergency Credit when made available; initiates supply reconnection from ‘READY' state; used to
exit diagnostic mode.
Activates auto scroll display from sleep mode; used to scroll back through a
display sequence; initiates UTRN authentication process; mutes alarm;
used to confirm supply reconnection from ‘READY’ state.
Displays ‘Not Used’
Table 3: Summary of Keypad functions
3.5 Firmware
Firmware in the meter is in two parts:
•Metrology firmware
Metrology firmware controls the measurement functions. It also provides an operating system for the
application firmware. This firmware is fixed and cannot be upgraded.
•Application firmware
Application firmware controls the functions of the meter outside of metrology. It is possible to remotely
upgrade this firmware to change the meter operation. Upgrade can be made locally via IEC 1107 optical
port or remotely over the air (OTA) via the communication module (hub). Upgrading or updating the
firmware will not affect the meter data unless the update involves changing the parameters of such data.
Information related to load survey, transactions, account balance, events and storage or contents in
billing registers such as prepayment balance are not affected during these upgrades.
Note: The current firmware name and version are available in meter readings and are also available on the
meter’s Diagnostic display.

BGX501-767-R02
Liberty 100 Smart Electricity Meter Technical Reference Manual
Page 19 of 116
4 Meter Specifications
4.1 General Specification
Specification Description
Mechanical
Dimension (in mm)
146 x 64 x 178
Weight (in kg)
1.0 approx.
Front cover Transparent fire-retardant polycarbonate material - V0
grade
Hub cover
Opaque polycarbonate material
Meter base with terminal block Opaque 10% glass filled fire-retardant polycarbonate
material - V0 grade
Terminals Brass material; tunnel type each with minimum internal
bore diameter of 10.0 mm
Short terminal block
Opaque fire-retardant polycarbonate material - V0 grade
Sealing provisions 2 seals on the front cover, 2 seals on the hub cover and 1
seal on the terminal block cover
Display LCD with backlight, 10 starburst character (7mm high) with
icons. Display visibility angles:
Vertical: 30 degrees up and 35 degrees down from normal
(straight on)
Horizontal: 30 degrees left and right from normal
Display operating temperature range from -20
0
C to +55
0
C.
Keypad
Silicon material
Electrical
Meter Type
1 phase, 2 wire
Voltage measuring element
Voltage divider
Current measuring element
Shunt
Rated voltage
230 V AC, ± 20% (L–N)
Rated current 0.5-10(100) A
The meter can withstand 460 V supply voltage and 120 A
current for 48 hours with no degradation in metrology.
Imin
0.5 A
Itr
1.0 A
Iref
10 A
Imax
100 A
Frequency
50 Hz ± 5%
Burden
Current circuit
Voltage circuit
< 0.1 VA
< 2 W ,< 4 VA average (with Skyline-i 510 fitted)
Metrology LED Red LED, 3200 pulses/kWh
Contactor Integral, 100A, UC3 (IEC 62055-31)

Page 20 of 116
Liberty 100 Smart Electricity Meter Technical Reference Manual
BGX501-767-R02
EMC/Electric Surge BS EN 50470-1, 50470-3
Compliance
Metrology Active Energy - BS EN 50470-1, 50470-3 Class B
Reactive Energy - IEC 62053-21, Class 1.0
Power consumption
BS EN 50470-1, 50470-3
Meter mounting, size and
terminal arrangements
BS 7856
Power source
RTC backup source
Battery life (typical)
Minimum shelf-life (typical)
Mains supply
Lithium battery
20 years
2 years
Data retention
Unpowered
20 years
Display format
Image area
Life expectancy
Alphanumeric with icons
80 x 24
20 years
Environmental
Operating temperature
Storage temperature
Operating humidity
Ingress protection
- 25 °C to + 55 °C
- 25 °C to + 70 °C
Up to 95% non-condensing
IP52
4.2 Handling, Storage and Operating Conditions
Liberty 100 meter is an electronic device containing delicate components, and should be handled carefully
during transit, storage and installation. The meter should be protected from physical vibration and shocks.
Wherever possible the meter should be kept in its original packaging until it is installed at the customer’s site.
Temperature and humidity must be maintained within the limits expressed in the above table.
Proper installation and removal procedures should be followed, in order to prevent damage or injury. Physical
damage to the meter’s case could indicate damage to internal components. Under no circumstances should an
attempt be made to install a damaged meter.
Ideally the meter should be stored and operated in a dry, well ventilated, climate-controlled building. Rapid
changes in temperature and humidity should be avoided.