DDM-3020N Diameter Lump and Neck Down Detector

Model No. DDM-3020N
Product Diameter 0.2 ~18 mm
Accuracy ± 2 µm
Exposure Time 200 μS
Measuring Rate 1800 measurements/sec/axis
Interfaces RS-485
Power Supply 100 – 240 V AC ± 10 %, 50/60 Hz, 20 VA
Dimensions 100 x 100 x 432 mm
Packing size: 615 x 330 x 280 mm
Weight 11 KG
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DDM-3020N Diameter measuring, Lump and Neck Down Detector

DDM-3020N is the DDM-3020 Diameter detector with Lump and Neck Down detection function.

Cable diameter controller DDM3020N used in the cable production line, the controller measures the diameter of the cable in real-time, and outputs an analog signal to control the speed of the tractor and extruder, so, the thickness of the insulation layer will be controlled in a setting range.

A complete set of the controller includes a DDM-3020N diameter measure head, measure head support and a separate DSP-3A Monitor.

DSP-3S/3D Diameter Remote Display is for DDM-3020N, it offers a remote display, the measuring result will be shown on the display.

The Cable diameter controller also called Optical Micrometer, detecting diameter with laser and CCD technology, detecting diameter with laser/ infrared ray and CCD technology, it was designed for wires, cables and tubes, which not only measure and display diameter and deviation online, but also automatically control diameter of wire according to user’s setting

Includes features listed but not limited as below.

A. Suitable for online measurement of any round wires, cable, fiber, tube, etc.

B. Non-contact measurement, high-speed inspection, high precision, and stable performance.

C. Inside PID regulation module.

D. Revolving operating panel.

E. RS485 communication interfaces, Modbus protocol.

F. Wide range of applications.

Operating condition


Operating Temperatures 0 ~ 45 C
power consumption 20 VA
Relative humidity Less than 90% without condensed water

Application and Features

DDM-3020N Diameter Monitor Measurer and Controller is used for online diameter measurement and control for electric wire and cable, optic fiber cable, tubes, and wires. compared with the previous generation products, the 3rd generation controller is characterized by All digital image process technique and dedicated ultra-large-scale integrated circuit, which ensures high stability, compact size, and low power consumption.

Hardware acceleration, which provides high measuring speed up to 1800 measurements/S and makes it possible to use the Gauge as a lump & neck detector.

RS-485 communication interface which makes the controller to be connected easily to an industrial computer, PLC and touch panel.

An advanced feedback control system, which improves the control effect.


Mouthing position

DDM-3020N Diameter Monitor Measurer and Controller can be mounted front or behind of the cooling trough.

When it is mounted in front of the cooling trough, an optimized controlling effect may be obtained through in-time feedback due to the proximity of the measuring head to the extruder. But at this time the plastic coating is not cured, so the set nominal value must be accordingly.



When it is mounted behind of cooling trough, the measured value is the real diameter of the wire or cable. But the controlling effect is not so good because of the large control lag. Be sure to blow dry the tested wire or cable, otherwise, the measuring precision will be affected by the water coating around the wire or cable.



In practical using, the nominal value shall be increased appropriately according to the water content of the test object.

Check out the link below for the Application solution.


Specifications of DSP-3S/3D

Model No. DSP-3S DSP-3D
Power Supply 100 – 240 V AC ± 10 %, 50/60 Hz, 20 VA 100 – 240 V AC ± 10 %, 50/60 Hz, 20 VA
power consumption Max 50 VA Max 50 VA
Display Mode 7 Segments LED digital 7 Segments LED digital
Display range 0~99.999 mm 0~99.999 mm
Interfaces RS-485 RS-485
Transfer Distance Max 1000m Max 1000m
Dimensions 585 x 205 x 125 mm 585 x 205 x 125 mm
Weight 5 KG 5 KG

DSP-3A Monitor Specifications

Power supply: 100 ~ 240VAC, 50~60Hz
Power consumption: < 5W
Operating temperature: 0~45 ℃
Atmospheric humidity: ≤ 90% (free of condensed water)
Display format: 5-digit LED digital display
Comm interface RS-485
Max commun distance: 1000 m
Control input: – 10V ~ +0V, input impedance 50 kΩ
Control output: – 10V ~ +10V, max 10 mA
Alarm output: Relay contact, max load 3A, 250VAC
Dimensions: 48mm × 96mm × 112mm

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