Product Description

DD28 type Meter is applicable for single phase active energy measurement, it is designed to meet IEC60521 standard for indoor and outdoor installation
1. Case：
1.1  base: Weather proof steel sheet
1.2  meter cover: It is made of ABS material, flame resistant, in black colour with glass window. Meter cover can also be made of transparent glass, weather proof and transparent plastic.
1.3  terminal block: It is made of phenolic resin, flame resistant, in black color, voltage link can be inside the meter base or outside the meter base.
Terminals are made of brass，having two screws for tightening the external cables.
1.4  terminal block cover
Short steel cover with rubber underside the cover, assures insulation between the cover and the terminal block; Short ABS cover is of non flammability, cover conforms to requirements of IEC60521.
Extended steel cover with rubber underside the cover, ensures insulation between the cover and the terminal block. Access is available at each side of the terminal cover for external cables.
2. Driving element
2.1  Current electromagnet
The overload compensating set mounted on the laminated silicon steel core assures the excellent load curve performance
2.2  Voltage electromagnet
The design of voltage electromagnet permits to withstand the impulse voltage of 6kv.
3. Braking element
Braking element is made of monopolar magnet, its adjustment range conforms to requirements of IEC60521.
4. Frame
The meter frame is made of aluminum alloy with sufficient strength, it is painted for effective protection against corrosion.
5. Moving element
5.1  Worm gear on the rotor shaft is made of brass or optionally plastic one,
5.2  Anti creeping pin is fitted to the rotor shaft to prevent running with no load
5.3  Anti reverse device can be mounted in the meter if it is required
5.4  Upper bearing :With excellent friction resistant property. The upper bearing pin is of polished stainless steel to guide the rotating of the disc
5.5  Low bearing (optional ): Double jewel bearing ,Magnetic bearing with metal enclosure, Magnetic bearing with transparent enclosure.

The bearing enclosure is made of transparent polycarbonate.
6. Register
The register is of cyclometer type, digit drums are made of polycarbonate, UV radiation resistant, the register is fixed on the meter frame by two screws.

It is adjustable to assure good mesh of worm with the rotor shaft Unidirectional register is available.
7. Name plate
Printing ink used for name plate is UV radiation resistant one.