The LEM031 series multimeter is DIN rail single phase multi-rate electronic energy meters. LEM031 series multimeter  adopt many advanced technologies of research and development, like microelectronic-techniques, specialized large-scale IC (integrated circuit), digital sampling and processing technology, SMT technique, and so on. Their technical performances for LEM031 series multimeter completely conform to International Standards IEC 62053-21 for Class 1 single phase active energy meter. LEM031 series multimeter can directly and accurately measure the load active energy consumption in the single phase AC networks of rated frequency 50Hz or 60Hz. The LEM031 series multimeter have multiple configurations for option, to be suitable with the various market demands. LEM031 series multimeter have features with excellent long-term reliability, small volume, light weight, perfect appearance, easy installation, etc.

√ LEM031 series multimeter; Available as 35mm DIN standard rail mounted, conforming to Standards DIN EN 50022, as well as front PANEL mounted (the center distance between two mounting holes is 63mm). Two mounted methods above are optional for user.
√ LEM031 series multimeter; 6 pole width (modulus 12.5mm), complying with Standards JB/T7121-1993.
√ LEM031 series multimeter; Can select time-of-use metering in 3 tariffs. Can set 12 daily intervals. Can freely set the date in every month to read meter automatically. Can set single tariff at weekends.
√ LEM031 series multimeter; Can select 2 tariffs metering, equipped with the tariff setting port, if the input control voltage is 0 - 90 Vac, the setting tariff is F1. If the input control voltage is 150 - 400 Vac, the setting tariff is F2. Tariff transduction is controlled by the external timer or similar device.
√ LEM031 series multimeter; The meter with time-of-use metering in 3 tariffs has clock chip inside and maintenance free lithium battery inside. The battery capacity can be detected in real time and displayed, keeping the data for 12 months.
√ LEM031 series multimeter; 7 digits LCD with two options: cycle display (default) or push-bottom display item by item. Can set the cycle display interval. Can select the data item of display. The decimal of the data display can be set to be 1 or 2 digits.
√ LEM031 series multimeter; Can select the inside far infrared data communication port and RS485 data communication port for meter setting or reading meter. The meter setting has password protection. The communication protocol complies with Standards DL/T645-1997, can also select the other communication protocol.
√ LEM031 series multimeter; S-connection (inlet wire from bottom and outlet wire on top) and direct connection.
√ LEM031 series multimeter; Equipped with a polarity passive energy impulse output terminal, conforming to Standards IEC 62053-31 and DIN 43864.
√ LEM031 series multimeter; LEDs indicate separately the power state, the energy impulse signal, load current flow direction, current tariff state and data communication state.
√ LEM031 series multimeter; 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.
√ LEM031 series multimeter; The short terminal cover is made with the transparent PC, to reduce the installation space and is convenient for centralized installation.

Wiring diagram -1 (Type S)
(Inlet wire from bottom, outlet wire on top)	Terminal	Note
	L	Phase line
	N	Neutral Wire
	3 and 4	Passive energy  impulse output port
	1 and 2	RS485  communication port

Wiring diagram -2 (Type S)
(Inlet wire from bottom, outlet wire on top)	Terminal	Note
	L	Phase line
	N	Neutral line
	5 and 6	Tariff setting port
	3 and 4	Passive energy  impulse output port
	1 and 2	RS485  communication port

Wiring diagram -3 (Type S)
(Inlet wire from bottom, outlet wire on top)	Terminal	Note
	L	Phase line
	N	Neutral line
	5 and 6	Tariff setting port
	3 and 4	Passive energy  impulse output port