This product has been discontinued and removed from our shelves.
DDS238 anti-tamper type single phase two wire type
DDS238 single phase KWH meter includes DDS238 single phase three wire type, DDS238 single phase two wire RS485 type, as well as DDS238 anti-tamper type single phase two wire type.
DDS238 anti-tamper type single phase two wire type is characterized by the advantages that are as follows.
1. This kind of single phase watt-hour meter is capable of measuring the theft of electricity by reverse connection, ground connection, as well as single live wire connection.
2. It is able to display the current, voltage, power, and electricity demand.
| Display Sequence and Information | Display Format | |
| 1 | Active energy kWh | XXXXXX.XX |
| 2 | Real current A | XX.XXX |
| 3 | Real current A | XXX.X |
| 4 | Real power KW | XX.XXXX |
| 5 | Maximum demand over the periods of 15 minutes KW | dXX.XXXX |
| LED Indication | Display Format | |
| 1 | Impulse | The impulse indicator will flicker while the meter is working. |
| 2 | Reverse | The reverse indicator will light when phase or neutral incoming and outgoing circuits are interchanged. |
| 3 | Tamper | The tamper indicator will light when the difference between phase load and neutral load exceed 12.5% as well as the power is in excess of 40W. (Such as connecting to earth or missing neutral line, etc.) |
Note: Normal condition is Ip=In (Ip is Phase current, In is Neutral current)
| Tamper Conditions | Meter status | |
| 1 | Incoming and outgoing circuits are interchanged/ swapped | Measure |
| 2 | Phase and neutral cables are interchanged | Measure |
| 3 | The incoming neutral is disconnected, while the outgoing neutral and load are connected to earth | Measure |
| 4 | The Incoming neutral is disconnected, while the outgoing neutral is connected to earth through resistor and the load is connected to earth | Measure |
| 5 | The incoming neutral is connected, while the outgoing neutral connected to earth through resistor and the load is connected to earth | Measure |
| 6 | Phase and neutral cables are interchanged and the load is connected to earth | Measure |
| 7 | Incoming and outgoing circuits (phase and neutral) are interchanged, and the load is connected to earth | Measure |
| 8 | Incoming and outgoing circuits (phase or neutral) are interchanged, and the load is connected to earth | Measure |
| 9 | Incoming and outgoing circuits (phase or neutral) are interchanged, and the load is connected to earth through resistor | Measure |
| 10 | Phase incoming and outgoing circuits as well as neutral line are all disconnected. | Measure |
Our anti-tamper meter can continue to register the active energy accurately even when the supply and load connections have been reversed. To prevent the return flow of load current through the meter partially or fully through the earth, the load connection will been rewired. At that time, our product is insensitive to load through earth irrespective of phase neutral connection. It will continue to register, even if there is neutral connection missing of either source or load or source and load both at a time. However, in these cases, the meter's starting current shall not be in excess of 1 amp. The measurement is not affected by all known tamper conditions including earth load, reverse power flow and source-load missing neutral conditions. Therefore, all the electric energy measured by our product shall be accumulated to the active energy.
Specification Submission and Compliance Sheet| Technical Particulars | Specification |
| Manufacturer's Name | ZHEJIANG LIXIN INSTRUMENT MANUFACTURING CO., LTD. |
| Country of Origin | CHINA |
| Catalog/Model Number | DDS238-A |
| 1) Type | Electronic |
| 2) Installation site | Outdoor |
| 3) Circuit system | 1-Phase, 2-Wire |
| 4) Rating voltage | 240V |
| 5) Voltage variation range | -20% to 15% (reference voltage) |
| 6) Rating current | 10(60)A |
| 7) Starting current | 40mA |
| 8) Frequency | 60 Hz (±5%) |
| 9) Class | Class-1 (IEC 62052-11 & 62053-21) |
| 10) Measuring Items | Energy (kWh) & Current (A) &Voltage (V) &Power (kW) & Max. Demand (KW) |
| 11) Registering Mechanism | LCD, 8 digits including 2 decimal places. Digit height-9mm, width-4.5mm; LCD life-15 years. The LCD can add a backlit display for easy reading of display parameter in low light conditions. |
| 12) Backup during Power Outage/ failure | A non-rechargeable, maintenance-free lithium battery supports for displaying the register values during mains power failure. |
| 13) Battery Life | The minimum service life of the battery is 15(Fifteen) years. |
| 15) Power Consumption in voltage Ckt. | Not exceeding 1 W & 7.5 VA |
| 16) Power Consumption in circuit Ckt. | Not exceeding 1.0 VA |
| 17) Meter Case | Reinforced polycarbonate /Engineering material, non-removable. |
| 18) Meter Base | Reinforced polycarbonate /Engineering material, non-removable. |
| 19)Terminal Cover | Reinforced polycarbonate /Engineering material, non-removable. |
| 20)Wire Connection | LNNL |
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