We believe that a smart meter is installed not just to provide an energy supplier with more information to put in their customers’ bills or statements. It is also there to show the customer exactly how much energy they are consuming throughout the day. This real-time information helps the customer see where they can reduce consumption, thereby saving money and reducing carbon emissions.

Secure Meters is proud to present the Liberty EG4v 11 smart gas meter, designed to meet the United Kingdom Smart Metering Equipment Technical Specification (SMETS) and give customers and energy suppliers a full range of both smart prepayment and smart credit features. Together with an easy-to-use in-home display (Pipit 500) or other smart in-home devices, this gives energy suppliers the information they need, via a communications hub built into a Liberty 100 smart electricity meter, as well as allowing customers to take control of their energy consumption.


Key Feature

    • G4 gas meter with smart electronic index and integrated isolation valve
    • Simple installation and registration process
    • Operates in either smart credit or smart prepayment mode
    • Operating modes can be remotely activated, and the meter can be remotely reprogrammed
    • Keypad on the meter for entering codes, in the absence of communications 
    • Specification
    • Meter

      Connection type

      UK-sized bosses at 6" (152.4 mm) centres

      Meter rating

      G4  Qmin 0.04m3/hr  Qmax 6.0m3/hr

      Working pressure

      Up to 0.2 bar



      Gas types                                                                        

      Natural, manufactured or liquid petroleum gas (LPG)



      MID Class 1.5     EN 1359

      ATEX Ex II 3 G Ex ic IIA T6


      Dimensions (W x H x D)

      235 mm x 268 mm x 175 mm


      3.5 kg (approx.)


      Electronic index, flame-retardant polycarbonate

      Main meter enclosure - powder coated cataphoretically protected steel


      Field-replaceable battery

      Isolation valve

      Rated for 2000 operations

      Audible alarm



      Ingress protection

      IP 54 (EN60529)


      -10 °C to +40 °C (operating),

      -25 °C to +55 °C (storage)


      95% non-condensing



      Remote firmware upgrade


      Slab, time-of-use (TOU) and complex (slab within TOU)

      Supports pending tariff structures supported, for delayed implementation

      Load survey

      3 months in meter (13 months in smart meter communications hub)


      Backlit 10-character alphanumeric starburst display, with icons for status


      12 keys: 0-9, A, B for local entry of PAYG code and access to displays

      PAYG functionality

      Credit and PAYG modes (meter maintains account and tariffs)

      Display of current and historical consumption with cost of consumption data

      Friendly Credit (avoids disconnection during unsocial hours, weekends or special days)

      Debt recovery


      AES128 encryption

      Battery life                                                                     

      >10 years, depending on operating mode

      Low battery warning

      Isolation valve

      Option for detection of excessive flow at valve opening, with immediate closure of valve

      Option for local customer acknowledgment before opening


      Alarm flag raised in event of meter tilt, excessive magnetic tamper, or battery cover open


      Local diagnostic port

      Optical IEC62056-21 (IEC1107) hardware-compatible port

      Communications module options


      HAN communications modules

      Multi-operator (roaming) SIMs supported