OUMIFAND QDW90A Pressure Transmitter User Manual

1. المقدمة

This manual provides essential instructions for the safe and effective use of the OUMIFAND QDW90A Pressure Transmitter. The QDW90A series is designed for precise pressure measurement in various industrial applications, offering multiple output signals including 4-20mA, 0-10V, 0-5V, and RS-485. This specific manual refers to the 0-1bar, 0-10V output variant. Please read this manual thoroughly before installation and operation to ensure optimal performance and safety.

2. معلومات السلامة

Adherence to the following safety guidelines is crucial for preventing injury and damage to the device:

• افصل الطاقة عن النظام دائمًا قبل القيام بأي إجراءات تركيب أو توصيل أسلاك أو صيانة.
• Ensure proper grounding of the transmitter and associated equipment to prevent electrical hazards.
• Do not exceed the specified pressure range or power supply voltage for the device. Over-pressure or incorrect voltage can lead to permanent damage.
• Installation and wiring should only be performed by qualified and experienced personnel familiar with industrial electrical and pressure systems.
• ارتدِ معدات الحماية الشخصية المناسبة، مثل نظارات الأمان والقفازات، أثناء التركيب والصيانة.
• Avoid exposing the transmitter to corrosive substances or extreme environmental conditions beyond its specified operating limits.

3. انتهى المنتجview

The OUMIFAND QDW90A Pressure Transmitter is a robust and reliable device engineered for accurate pressure sensing. Its design incorporates high-quality materials and advanced technology to ensure precision and durability in demanding industrial environments. The transmitter converts measured pressure into a standardized electrical signal for monitoring and control systems.

الشكل 1: عام view of the OUMIFAND QDW90A Pressure Transmitter.

Key features and internal components include:

• السكن: Constructed from SS304/SS316 material for anti-corrosive properties, ensuring longevity in harsh conditions.
• منفذ الضغط: High-strength adhesive design provides high pressure resistance and leak-proof sealing.
• Core Body: Features an imported diffusion silicon chip for instantaneous response (8ms) and a pure copper core with a high melting point for high temperature resistance.
• الالكترونيات: Advanced circuitry provides 0.2% FS high precision and strong anti-interference capabilities.
• مضاد-دamping Design: Resistant to 300% instantaneous impact, enhancing durability.
• موصل كهربائي: PVE engineer plastic, flame retardant and pressure resistant, ensuring safe electrical connections.

الشكل 2: انفجرت view illustrating the internal components and materials of the QDW90A Pressure Transmitter.

The QDW90A is suitable for a variety of working conditions, including constant pressure water supply, hydraulic systems, vacuum negative pressure, and air pressure testing.

الشكل 3: تطبيق examples for the QDW90A Pressure Transmitter in various liquid and gas systems.

4. المواصفات

5. الإعداد

5.1. التركيب

Select a mounting location that is stable, free from excessive vibration, and within the specified operating temperature range (-20°C to 60°C). Ensure the pressure port is correctly sealed to the process connection to prevent leaks. Use appropriate thread sealant if necessary. Avoid overtightening the transmitter during installation to prevent damage to the threads or housing.

5.2. الأسلاك

The QDW90A series supports various output signals. Ensure you connect the transmitter according to its specific output type (e.g., 0-10V for this variant) and your system's requirements. Always refer to the wiring diagram provided with your specific unit if available. General wiring guidelines are as follows:

• For 0-10V / 0-5V Output (3-wire connection):
  Connect the positive power supply (12-36VDC) to the designated power input terminal.
  Connect the negative power supply (Ground) to the designated ground terminal.
  Connect the signal output terminal to the input of your receiving device (e.g., PLC, display).
• For 4-20mA Output (2-wire connection):
  Connect the positive power supply (12-36VDC) to the designated power input terminal.
  Connect the signal/power negative terminal to the input of your receiving device, completing the loop.
• For RS-485 Output (4-wire connection):
  Connect the positive power supply (12-36VDC) to the designated power input terminal.
  Connect the negative power supply (Ground) to the designated ground terminal.
  Connect the Data A terminal to the A input of your RS-485 master device.
  Connect the Data B terminal to the B input of your RS-485 master device.

Verify all connections for continuity and correct polarity before applying power. Improper wiring can damage the transmitter or the receiving equipment.

5.3. مصدر الطاقة

Connect the transmitter to a stable DC power supply within the 12-36VDC range. Ensure the power supply can provide sufficient current for the transmitter's operation (Full Load Consumption: 2W). Fluctuations in power supply voltage can affect measurement accuracy.

6. تعليمات التشغيل

Once the OUMIFAND QDW90A Pressure Transmitter is correctly installed and wired, apply power to the device. The transmitter will immediately begin measuring the applied pressure and outputting the corresponding electrical signal.

• مراقبة الإشارة: Monitor the output signal using a compatible receiving device such as a Programmable Logic Controller (PLC), a digital display unit, or a data logger. Ensure your receiving device is configured to correctly interpret the 0-10V signal (for this variant) or other output types.
• Pressure Interpretation: The output signal is directly proportional to the measured pressure within the specified range (0-1 bar for this variant). For a 0-10V output, 0V typically corresponds to 0 bar, and 10V corresponds to 1 bar. Consult your system's documentation for specific scaling.
• اتصالات RS-485: For RS-485 models, ensure that the communication parameters (baud rate, parity, data bits, stop bits, device address) are correctly configured on both the transmitter and the master device to establish proper data exchange.

The QDW90A offers a fast response time of 0.05s, providing near real-time pressure readings.

7. الصيانة

Regular maintenance helps ensure the long-term accuracy and reliability of your pressure transmitter.

7.1. التفتيش الدوري

Periodically inspect the transmitter for any visible signs of damage, such as cracks in the housing, corrosion, or loose electrical connections. Ensure the pressure port remains clear of any debris or blockages that could affect pressure transmission.

7.2. التنظيف

Clean the exterior of the transmitter with a soft, damp cloth. Do not use abrasive cleaners, solvents, or harsh chemicals that could damage the IP65-rated housing or electrical components. Ensure no liquid enters the electrical connection area.

7.3. المعايرة

For critical applications requiring high accuracy, periodic calibration by a qualified technician is recommended. The frequency of calibration depends on the application's requirements, operating conditions, and industry standards. The QDW90A boasts a long-term stability of 0.2% FS/year and a stability of ≥10 years, but regular checks are still advisable for precision applications.

8. استكشاف الأخطاء وإصلاحها

If you encounter issues with your OUMIFAND QDW90A Pressure Transmitter, refer to the following troubleshooting guide:

8.1. No Output Signal

• التحقق من مصدر الطاقة: تأكد من توصيل مصدر الطاقة بشكل صحيح وتوفير الجهد المحددtagه (12-36VDC).
• فحص الأسلاك: Ensure all wiring connections are secure, correct, and free from damage. Check for proper polarity.
• نطاق الضغط: Confirm that the applied pressure is within the transmitter's specified operating range (e.g., 0-1 bar).
• Receiving Device: Ensure the receiving device (PLC, display) is powered on and configured to accept the transmitter's output signal.

8.2. Incorrect or Unstable Readings

• مصدر الضغط: Verify that the pressure source is stable and accurately measured by a known reference.
• منفذ الضغط: Check for any blockages, air bubbles (in liquid applications), or leaks in the pressure connection.
• العوامل البيئية: Ensure the operating temperature is within the specified range. Extreme temperatures can affect accuracy.
• التداخل الكهرومغناطيسي (EMI): If readings are unstable, check for nearby sources of strong EMI. Ensure proper grounding and shielded cables if necessary.
• Receiving Device Configuration: Double-check the scaling and input type configuration on your receiving device.

8.3. Leaks at Pressure Connection

• ضيق: Ensure the transmitter is securely tightened to the process connection.
• مانع التسرب: Use appropriate thread sealant (e.g., PTFE tape) if required for your application.
• ضرر: Inspect the threads of both the transmitter and the process connection for any damage.

If problems persist after performing these checks, contact technical support.

9. الضمان والدعم

For detailed warranty information regarding your OUMIFAND QDW90A Pressure Transmitter, please refer to the terms and conditions provided at the point of purchase or contact your supplier directly. Keep your purchase receipt and the product model number (QDW90A) readily available when seeking support.

For technical assistance, troubleshooting beyond this manual, or inquiries about product specifications, please contact OUMIFAND customer support or your authorized distributor. Contact information can typically be found on the product packaging or the manufacturer's official webموقع.