Three-Phase multi-function watt-hour meter (LTM34-7)

Detailed Product Description

General

Three-phase electronic multi-function kWh meter adopts the advanced LSI, digital

acquisition processing and SMT techniques. For the purpose of meeting the real

application situation in the Chinese industry customers needs, this product is designed

and manufactured as the international advanced new generation of electronic multi-

function kWh meter. The product can accurately measure forward and backward active and

reactive energies, active and reactive powers, parameters of voltage, current and

frequency, It can provide data processing for the customers` relevant tariff and demand,

It has 4 tariffs, 4 time intervals, 10 date segments, clock and 10-year calendar,

infrared remote programmable meter reading, RS 485 communication interface and etc.

functions. The specifications can meet the requirements of  IEC62053-

22:2003,IEC62053-23:2003 and IEC62056-21<<Electricity metering-data exchange for meter

reading, tariff and load control-part21:direct local data exchange>>.

Technical characteristics
1. Time-of-use metering for forward and backward active energies.
2. Time-of-use metering for 4 quadrants reactive energies.
3. Time-of-use metering maximum electricity demands for forward and backward active

energies.
4. 4 tariffs, 4 time intervals, 10 date segments.
5. Functions of switch pulling and power off testing.
6. RS485 interface for PC communication; infrared communication, program setting and

reading with palm computer set; infrared remote reading (manual recording).
7. LCD display for various parameters setting and measurement data.
8. Realization of parameters polling display. The polling parameters (no more than 32

items) and time can be preset. The order of the polling parameters can also be preset

arbitrarily.
9. The measurement RMS of voltage, current and frequency.
10. Functions for programmable prohibit, data clear and demand reset.
11. Customer may select the inner power off reading mode which can, in the condition of

power off and  no outer direct power supply, do meter reading with infrared remote

controller for more than 1000 times readings. This reading mode does not influence the

life of data saving battery.

Technical parameters

1. Starting: in accordance with IEC62053-22:2003 and IEC62053-23:2003.
2. No load rotation: in the condition of switch off current circuit and 115% voltage

applied on voltage coil, the meter's output is no less than 1 pulse.
3. Tariff working parameters.
4  Clock accuracy (dated error): ≤0.5s(23'C).
5 Battery capacity: ≥1000mAh.
6 Data saving time after power off: ≥10 years (new battery).
7.Hold time for battery changing after power off: ≥1h.
8. Voltage range:
   8.1 Normal voltage: 0.9Un1.1Un.
   8.2 Limit voltage: 0.8Un1.15Un.
9. Power loss:
   9.1 Voltage circuit: ≤2W/5VA
   9.2 Current circuit: ≤1VA.
10. Climate conditions:
   10.1 Working temperature range: -25'C to +55'C
   10.2 Limit temperature range: -40'C to+70'C
   10.3 Storage and transportation temperature range: -40'C to+70'C.
   10.4 Humidity: 95% within 30 days per year (nature distribution mode), 85% in the rest

time.

11. Battery voltage in power off meter reading: 6.0VDC.
12. Backup battery voltage: 6.0VDC,
13. Weight:about 2.8kg.