Stop Wasting Money on Cables That Crack and Fail in Harsh Environments
You know the frustration. You install a liquid level sensor system in a tank or deep well. Everything works fine for a few months. Then, the readings start to jump. The signal gets weak. You pull the cable up, and you see the disaster. The outer jacket is cracked. The copper wires are green with corrosion. Or worse, the cable is stiff and broken from constant movement.In industrial settings, a broken cable means downtime. It means sending a technician to a remote oil field or a muddy construction site. It costs labor, travel, and lost production. Standard PVC cables just cannot handle the real world. They get brittle in the cold. They get soft and sticky in the heat. Chemicals eat them alive.You need a cable that fights back. You need the DQYUP 4-core 0.2mm² Polyurethane gas duct cable. This is not just a wire. It is a tough, flexible armor for your sensitive sensor signals. It is built for the PU-0449D level transmitter applications where other cables die. Let’s look at why this specific cable solves your biggest headaches.
What Exactly is the DQYUP 4-Core 0.2mm² PU Cable?
This cable has a special job. It does two things at once. First, it sends power and signal data from your control room to the liquid level transmitter. Second, it has a built-in air tube (gas duct) inside. This tube lets air pass through. It is crucial for pressure balance and ventilation in sealed tanks.We call this model the DQYUP. The “DQ” stands for sensor cable. “Y” means polyethylene insulation. “U” stands for polyurethane (PU) sheath. “P” means shielding.The core wire structure is 4 cores, each with a cross-section of 0.2 square millimeters. This size is perfect for low-voltage sensor signals (4-20mA). It is small enough to be flexible but thick enough to carry the signal over long distances without voltage drop.Unlike cheap cables, we use tinned copper conductors. Why? Because bare copper rusts when it touches moisture. Tin coating stops oxidation. It keeps the electrical resistance low (around 95 Ohms per kilometer at 20°C). This ensures your signal stays strong, even if the cable is 500 meters long.
Technical Specifications You Can Trust
When you buy this cable, you get exact performance numbers. We do not guess. We test every batch. Here is the data sheet for the DQYUP 4*0.2mm² model:
- Cable Model: DQYUP (Derul 31372 / PU-0449D)
- Core Configuration: 4 Cores x 0.2mm² + Gas Duct
- Conductor Material: Annealed Tinned Copper (99.99% purity)
- Insulation Material: High-density Polyethylene (PE)
- Sheath Material: Thermoplastic Polyurethane (PUR/PU)
- Shielding: Tinned Copper Braid (Coverage > 80%)
- Outer Diameter: Approx. 7.3mm (±0.2mm)
- Weight: Approx. 60kg per 100 meters
- Working Voltage: 300V / 500V (Low voltage control)
- Test Voltage: 1000V DC (1 minute, no breakdown)
- Insulation Resistance: ≥ 20 MΩ·km at 20°C
- Operating Temperature: -40°C to +90°C (Short term up to 130°C)
- Minimum Bending Radius: 6 times cable diameter (approx. 45mm)
- Flame Retardant: Self-extinguishing (IEC 60332-1)
- Oil & Chemical Resistance: Resistant to acids, alkalis, and hydrocarbons
These numbers matter. For example, the 80% shielding coverage is critical. It stops electromagnetic interference (EMI) from nearby motors or VFD drives. If you don’t have good shielding, your level readings will “jitter.” This cable locks the signal in.
The Secret Weapon: Why We Use Polyurethane (PU) Sheath
The outer jacket is the most important part of the cable. It takes the abuse. We chose Polyurethane (PU) for three big reasons.1. Extreme Flexibility in Cold WeatherStandard PVC gets hard like a rock at -20°C. If you try to bend it, it cracks. Our PU sheath stays soft and rubbery down to -40°C. This is vital for outdoor winter installations or cold storage tanks. You can pull this cable through conduit bends easily, even in freezing weather. It does not kink. It does not snap.2. Unbeatable Abrasion and Tear ResistanceImagine dragging a cable over sharp rocks or rough concrete. PVC gets scratched and cut. PU is tough. It resists cutting and grinding. In mining applications or construction sites, the cable rubs against rocks. The PU sheath protects the inner wires from physical damage. It has high mechanical strength (tensile strength > 500 N/mm²).3. Superior Oil and Water ProtectionOil and water are the enemies of electronics. Our PU material has a very low water absorption rate. It forms a tight seal. In oil fields or chemical plants, the cable might sit in a puddle of oil or acidic sludge. The PU sheath does not swell or dissolve. It keeps the inside bone dry. This prevents short circuits and extends the cable life to 5-10 years, compared to 1-2 years for standard cables.
The Built-in Gas Duct: More Than Just a Cable
This is the feature that makes the DQYUP unique. Look at the cross-section. In the center, or between the cores, there is a hollow tube. This is the gas duct or breathing tube.Why do you need a tube inside the cable?In deep well monitoring or sealed tanks, pressure changes happen. When the liquid level drops, a vacuum can form. This vacuum can crush a standard sensor cable or suck water into the connector.The gas duct equalizes the pressure. It acts like a snorkel for your sensor. It allows air to flow in and out freely from the top of the well to the sensor at the bottom.This design is essential for piezometric level measurement. It ensures the sensor reads the true liquid pressure, not the air pressure trapped inside the cable.The tube is made of hydrophobic material. It does not absorb water. It stays clear and open for years.
Real-World Applications: Where This Cable Shines
You might ask, “Is this cable right for my project?” Here are the top scenarios where we sell this cable. If you see your project here, this is the cable you need.1. Oil and Gas Industry (Oil Wells & Pipelines)
- Pain Point: High pressure, hydrogen sulfide (H2S) gas, and crude oil exposure.
- Solution: The PU sheath resists oil swelling. The tinned copper resists sulfur corrosion. The gas duct handles downhole pressure.
- Use Case: Permanent downhole gauge (PDG) installation, pipeline blockage monitoring.
2. Water and Wastewater Treatment
- Pain Point: Constant moisture, chlorine, and biological growth in sewage.
- Solution: Waterproof PE insulation and PU sheath. Anti-microbial properties.
- Use Case: Sewage pump station level control, drinking water reservoir monitoring, river hydrology stations.
3. Chemical Tanks and Industrial Process
- Pain Point: Strong acids (like sulfuric acid) and alkalis (like caustic soda).
- Solution: PU is chemically inert to most industrial solvents.
- Use Case: Acid storage tank level measurement, reactor vessel pressure monitoring, dyeing machine sensors.
4. Geotechnical and Mining
- Pain Point: Rough handling, rocks, and underground moisture.
- Solution: High tensile strength and abrasion resistance.
- Use Case: Groundwater monitoring wells, slope stability sensors, mine dewatering control.
5. Food and Beverage (Specific Cases)
- Pain Point: Need for washdown capability and non-toxic materials.
- Solution: PU is free of plasticizers and halogens. It can withstand high-pressure washdowns.
- Use Case: Large fermentation tank level control (note: requires specific food-grade certification request).
Quality Control: How We Make Sure It Works
We do not just make cables; we test them to destruction. For the DQYUP 4*0.2 production line, we run these tests on every spool:
- Spark Test: We run high voltage through the wire to find tiny pinholes in the insulation. If it sparks, we cut that section out.
- Tensile Test: We hang a 50kg weight on the cable and pull it to ensure the conductors don’t break and the sheath doesn’t tear.
- Cold Bend Test: We put the cable in a -40°C freezer for 24 hours. Then we bend it around a mandrel 6 times its diameter. It must not crack.
- Aging Test: We put the cable in an oven at 90°C for 168 hours to simulate 10 years of use. The jacket must not get sticky or brittle.
When you buy from us, you are buying peace of mind. We have been making special sensor cables since 2016. We even helped write the Anhui Provincial Standard for this type of cable.
Customization and Packaging for Global Shipping
We know you have unique needs. Maybe you need a different color jacket (Yellow for gas, Black for general). Maybe you need a special connector on the end. Maybe you need 500 meters on a wooden drum, not a plastic spool.We can do it all.
- Conductor: We can use bare copper or silver-plated copper for extreme conductivity.
- Shielding: We can add double shielding (foil + braid) for high-interference zones.
- Armor: We can add stainless steel wire armor (SWA) if you need rodent protection (model DQYUP22).
- Length: Standard is 100m or 500m rolls. We can cut to length or do 1000m drums.
Packaging:We know shipping damage is a big pain. We use heavy-duty wooden drums or plywood spools. The cable is wrapped in plastic film to stop moisture during sea freight. The outer layer is a woven belt to stop the drum from rolling around in the container. We can add “Fragile” and “Keep Dry” stamps.Shipping Time:We keep stock of the DQYUP 4*0.2 model. For samples, we ship via DHL/FedEx (3-5 days). For bulk orders (1000m+), we ship by sea (30-45 days to US/Europe ports).
Why Buy From Us?
You have many choices for cables. But most suppliers only sell standard PVC wires. They don’t understand sensor technology. They don’t understand gas ducts.We are a factory, not just a trader. We have a dedicated R&D team with cable experts from Germany and China. We solve problems. If you tell us your application, we will recommend the exact cable structure. We won’t sell you something that will fail.Our price is competitive because we make the raw material compounds ourselves. We control the cost of the PU and the copper. We pass that savings to you.
Ready to Stop Cable Failures? Let’s Talk.
You have seen the specs. You know the DQYUP 4-core 0.2mm² PU gas duct cable is the right tool for the job. It handles the cold, the chemicals, and the rough pulling. It protects your expensive sensors.Don’t wait for the next cable failure. Get a quote today. Tell us your voltage, your depth, and your chemical environment. We will send you a detailed PDF datasheet and a price within 24 hours.Click the “Contact Supplier” button now. Send us your inquiry. Let’s build a reliable system together.Inquiry Checklist:
- Quantity needed (meters)
- Destination port (for shipping cost)
- Special requirements (color, connector, printing on cable)
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