DC two-wire inductive proximity sensor series is a non-contact metal detection device for industrial automation, including M8, M12, M18, and M30 models. It supports DC two-wire power supply and detects metals like iron, steel, and aluminum. The brand is known for high reliability, durability, and cost-effectiveness, widely used in mechanical manufacturing, assembly lines, robotic arms, and conveyor systems. Sensors feature nickel-plated brass housing with IP67 protection for stable operation in harsh environments like humidity, dust, or vibration. Outputs include NO/NC for easy PLC integration. Two-wire design simplifies wiring and reduces costs while maintaining precision. Key advantages: 1-15mm sensing range, LED indicators, short-circuit and reverse polarity protection. Compliant with CE standards, offering 2-meter cable or M12 connector options, with flush/non-flush mounting for optimized performance.
The DAIDISIKE DC two-wire inductive proximity sensor series is a non-contact detection device designed for industrial automation. This series includes M8, M12, M18, and M30 size models, supporting DC two-wire power supply, suitable for detecting metal objects such as iron, steel, aluminum, and other non-magnetic metals. The DAIDISIKE brand is renowned for its high reliability, durability, and cost-effectiveness. These sensors are widely used in mechanical manufacturing, assembly lines, robotic arms, conveyor systems, and other fields. The sensors feature a nickel-plated brass housing with IP67 protection rating, enabling stable operation in harsh environments such as humidity, dust, or vibration. Output types include normally open (NO) and normally closed (NC), facilitating integration into PLC or control systems. Compared to three-wire or four-wire sensors, the two-wire design simplifies wiring, reduces installation costs, while maintaining high-precision detection.
The key advantages of this series include: extended sensing range (from 1mm to 15mm depending on the model), LED indicator for status monitoring, short-circuit protection, and reverse polarity protection. DAIDISIKE ensures products comply with international standards such as CE certification and offers 2-meter cable or M12 connector options. Users can choose flush or non-flush mounting based on application needs to optimize detection performance.
Specifications Table
The following is a detailed specifications table for the DAIDISIKE DC two-wire inductive proximity sensor series, organized by size:
Parameter
M8
M12
M18
M30
Model Size
M8
M12
M18
M30
Housing Material
Nickel-plated brass
Nickel-plated brass
Nickel-plated brass
Nickel-plated brass
Sensing Distance (Flush)
1-2mm
2-4mm
5-8mm
10-15mm
Sensing Distance (Non-Flush)
1.5-3mm
3-6mm
7.5-12mm
15-22mm
Supply Voltage
10-30V DC
10-30V DC
10-30V DC
10-30V DC
Current Consumption
≤10mA
≤10mA
≤10mA
≤10mA
Load Current
5-200mA
5-200mA
5-200mA
5-200mA
Switching Frequency
2000Hz
1500Hz
1000Hz
500Hz
Output Type
NO/NC (optional)
NO/NC (optional)
NO/NC (optional)
NO/NC (optional)
Protection Rating
IP67
IP67
IP67
IP67
Operating Temperature
-25°C to +70°C
-25°C to +70°C
-25°C to +70°C
-25°C to +70°C
Connection Method
2m cable / M12 connector
2m cable / M12 connector
2m cable / M12 connector
2m cable / M12 connector
Repeat Accuracy
≤5%
≤5%
≤5%
≤5%
Dimensions (Length)
40-50mm
50-60mm
60-70mm
70-80mm
Weight
Approx. 20g
Approx. 50g
Approx. 100g
Approx. 150g
Certifications
CE, RoHS
CE, RoHS
CE, RoHS
CE, RoHS
Note: Specifications may vary slightly by specific model; please refer to the product manual for exact values. Sensing distance is for standard iron targets (size twice the sensing distance).
Technical Parameters
The technical parameters of the DAIDISIKE DC two-wire inductive proximity sensors are as follows, ensuring high performance and reliability in industrial environments:
Supply Voltage Range: 10-30V DC, supporting ripple (p-p) ≤10%, suitable for most industrial power systems.
Leakage Current: ≤1mA in no-load state, energy-efficient.
Voltage Drop: ≤3.5V, ensuring stable output under load.
Hysteresis: 3-20% of sensing distance, preventing false triggers and improving detection accuracy.
Temperature Drift: ≤±10% (within -25°C to +70°C range), adapting to temperature variations.
Shock and Vibration Resistance: Compliant with IEC 60947-5-2, vibration 10-55Hz, shock 30g.
Electromagnetic Compatibility: Anti-EMI, compliant with EN 61000 standards.
Sensing Head Material: PBT plastic, resistant to corrosion and mechanical damage.
LED Indication: Yellow LED for output status display, convenient for on-site debugging.
Reverse Polarity Protection: Yes, ensuring installation errors do not damage the sensor.
Response Time: ≤1ms, suitable for high-speed applications.
Target Material: Ferromagnetic and non-ferromagnetic metals, with correction factors for different materials (e.g., stainless steel 0.7, aluminum 0.4).
These parameters are based on industry standards and verified through rigorous testing, ensuring long-term stable operation of DAIDISIKE sensors in automated production lines.
Working Principle
The working principle of the DAIDISIKE DC two-wire inductive proximity sensor is based on electromagnetic induction. Specifically, the sensor contains a high-frequency oscillation circuit internally, which generates an alternating magnetic field. When a metal object (target) enters the sensor's sensing area, eddy currents are induced in the target, altering the impedance and amplitude of the oscillation circuit. The sensor detects this change and, through an internal amplifier and comparator circuit, converts the signal into a switch output.
Detailed process:
1. Oscillator Generates Magnetic Field: The front-end coil of the sensor produces a high-frequency magnetic field (typically several hundred kHz).
2. Target Approaches: The metal object enters the magnetic field, absorbs energy, and generates eddy currents, causing field attenuation.
3. Detects Change: The oscillator's amplitude or frequency change is captured by the detection circuit.
4. Signal Processing: Through threshold comparison, outputs a switch signal (NO or NC).
5. Two-Wire Design: Power and signal are transmitted via the same pair of wires, simplifying the circuit; the load is connected in series in the power loop, and when the sensor activates, current changes drive the load.
This non-contact detection avoids mechanical wear, enhancing lifespan (typically over 10^7 operations). In professional terms, this is an "Inductive Proximity Sensor," compliant with IEC 60947-5-2 standards, commonly used for "Position Sensing" and "Presence Detection." Compared to capacitive sensors, inductive ones are better suited for metal targets and unaffected by dust or liquids.
Frequently Asked Questions
What is a DC two-wire inductive proximity sensor and how does it wire up?
A DC two-wire sensor carries both power and the switching signal on the same pair of conductors, with the load wired in series in the supply loop. This cuts wiring to two cores instead of three, simplifying installation. The DAIDISIKE series runs on 10-30 V DC with NO or NC output and built-in reverse-polarity and short-circuit protection.
Which size should I pick: M8, M12, M18 or M30?
Size sets the sensing distance and body length. The M8 detects standard steel at about 1-3 mm, M12 at 2-6 mm, M18 at 5-12 mm and M30 at 10-22 mm depending on flush or non-flush mounting. Larger bodies give longer range and faster targets need the higher switching frequency of the smaller sizes (M8 reaches 2000 Hz).
What is the difference between two-wire and three-wire (NPN/PNP) proximity switches?
Two-wire sensors are polarity-based and load-in-series, so they suit simple NO/NC switching with minimal cabling but have a small leakage current (≤1 mA) and voltage drop (≤3.5 V). Three-wire PNP vs NPN sensors keep load and supply separate for cleaner signals into a PLC. Choose two-wire when you want the simplest wiring and the controller tolerates the leakage.
Can this replace an Omron, Balluff or Autonics two-wire proximity sensor?
Usually yes. It shares the standard M8/M12/M18/M30 thread, 10-30 V DC two-wire operation, IP67 rating and a comparable 1-22 mm sensing range, so it fits the same brackets and 2 m cable or M12 connector. Match the body size, flush or non-flush type and NO/NC output to the unit being replaced for a drop-in swap.
What protection rating and target materials does it support?
Every model is rated IP67 with a nickel-plated brass housing, suitable for humid, dusty and vibration-prone lines and compliant with IEC 60947-5-2. It detects ferromagnetic and non-ferromagnetic metals, applying a correction factor for the rated Sn distance, roughly 0.7 for stainless steel and 0.4 for aluminium versus standard mild steel.
