The LEM091 series prepayment meter are front panel mounted single phase two wire electronic prepayment active energy meters, recently researched and developed by us. LEM091 series prepayment meter with IC card as the medium for purchasing credit, they centralize many functions together, like electricity metering, load control, consumption information management, and so on. LEM091 series prepayment meter technical performances completely conform to International Standards IEC 62053-21 for Class 1 single phase active energy meter. LEM091 series prepayment meter can accurately measure the load active energy consumption in the single phase AC networks of rated frequency 50Hz or 60Hz and used indoors or in the meter box outdoors. The LEM091 series prepayment meter has multiple configurations for option, to be suitable with the various market demands. LEM091 series prepayment meter has features with excellent long-term reliability, small volume, light weight, perfect appearance, easy installation, etc.

Functions and features

√ LEM091 series prepayment meter; Front panel mounted in 3 points for fixing, the appearance and dimensions are in accordance with Standards BS 7856 and DIN 43857.
√ LEM091 series prepayment meter; 6 digits LED or 7 digits LCD display for option.
√ LEM091 series prepayment meter; Can select one meter with one card and the card can be reloadable via the computer with an IC card programmer.
√ LEM091 series prepayment meter; Can select the meter suitable for both reloadable IC card and disposable IC card. To load, please let both IC card programmer and the computer on line. It is also available to load via the separate offline IC card programmer.
√ LEM091 series prepayment meter; Can select the inside far infrared communication module and RS485 communication module, for reading meter, remote control credit and system parameter setting.
√ LEM091 series prepayment meter; Keypad IC card programmer and universal IC card programmer for option.
√ LEM091 series prepayment meter; IC card is with data encryption and anti-fake protection.  
√ LEM091 series prepayment meter; Prepayment mode is by kWh. Another mode by credit is for option when ordering.
√ LEM091 series prepayment meter; Standard configuration of prepayment management system software is a single computer version. Network version is for option when ordering.
√ LEM091 series prepayment meter; Have the functions of load control, automatic detection and indication of fault. Standard configuration is without the detection function of opening terminal cover. When ordering, you can add the function: while opening terminal cover,  the power will be cut.
√ LEM091 series prepayment meter; Equipped with a polarity passive energy impulse output terminal, conforming to Standards IEC 62053-31 and DIN 43864.
√ LEM091 series prepayment meter; LEDs indicate separately the power state (green), the energy impulse signal (red), load current flow direction (yellow).
√ LEM091 series prepayment meter; Automatic detection for the load current flow direction, yellow LED lighting means reverse current flow.
√ LEM091 series prepayment meter; Measure the active energy consumption in one direction on single phase two wire, which is not related with the load current flow direction at all, complying with Standards IEC 62053-21.
√ LEM091 series prepayment meter; Direct connection. Two types of connections: type 1A and type 1B for option.
√ LEM091 series prepayment meter; Can select the extended terminal cover or short terminal cover.

Technical parameters

  Technical parameters
Model Accuracy Reference voltage (V) Current specifications (A) Starting current (A) Insulation performance
LEM091XX Class 1 127 or 230 5(30)
AC voltage 4kV for 1 minute, 
1.2/50us waveform impulse voltage 6kV.

Outer and mounting dimension

Outer and mounting dimension

Wiring diagram

  Wiring diagram -1 (type 1B)
Terminals Note
1 Inlet phase wire
3 Outlet phase wire
4 Inlet neutral wire
6 Outlet neutral wire
2 and 5 Passive energy impulse output port

  Wiring diagram -2 (type 1A)
  Terminals Note
1 Inlet phase wire
3 Inlet neutral wire
4 Outlet neutral wire
6 Outlet phase wire
2 and 5 Passive energy impulse output port

Product configuration table

Product configuration table
  Configuration Options Configuration Code

6 digits LED

7 digits LCD

One meter with one reloadable card

Suitable for both reloadable IC card and disposable IC card

Inside far infrared communication module and RS485 communication module

Universal IC card programmer

Keypad IC card programmer

Outer and mounting dimension - 1, extended terminal cover

Outer and mounting dimension - 2, short terminal cover

Single phase two wire, Type 1B (Wiring diagram - 1)

Single phase two wire, Type 1A (Wiring diagram - 2)