High Temperature Pressure Transmitter User Manual

1. Introduction

This manual provides essential information for the safe and efficient operation of your Qidian Sensor High Temperature Pressure Transmitter (Model: QDW90A-G). Please read these instructions carefully before installation and use to ensure optimal performance and longevity of the device.

The QDW90A-G series pressure transmitters are designed for precise pressure measurement in high-temperature environments, offering various output signals and measurement ranges to suit diverse industrial applications.

2. Key Features

• High Temperature Resistance: Default operating temperature up to 200°C, maximum up to 350°C.
• Wide Voltage Supply: Supports 9-30V DC power supply.
• Multiple Output Signals: Available with 4-20mA, 0-10V, 0-5V, RS485, and 0-3.3V outputs.
• High Accuracy: 0.2% F.S (Full Scale) or 0.5% F.S (default) comprehensive accuracy.
• Robust Construction: Low copper aluminum alloy shell with 316L internal sensor, compatible with various liquids and gases.
• Advanced Design: Features imported diffused silicon core for stable performance, 3mm pressure hole for reduced instantaneous pressure impact, and upgraded circuit board for stronger electromagnetic compatibility (EMC).
• Digital Display Options: Available with or without LCD digital display.

3. Setup and Installation

Proper installation is crucial for the accurate and reliable operation of the pressure transmitter. Ensure all connections are secure and follow the wiring diagrams carefully.

3.1 Component Overview

Figure 1: Pressure sensor with LCD display.

Figure 2: Pressure sensor without LCD display.

The transmitter features a robust design with various connection types. Ensure the selected model matches your application's requirements for output signal, measuring range, and threaded joint.

3.2 Wiring Instructions

Refer to the following diagrams for correct wiring. Ensure the power supply is DC 12-36V (DC24V recommended) and the cable's outer diameter fits within the sleeve's allowable range for proper sealing and protection.

Figure 3: Wiring diagrams for 2-wire current and voltage output systems.

1. Loosen the M3 screws with cross pan heads.
2. Remove the plastic plug-in.
3. Pry the connector into the socket with a flat-head screwdriver inserted from the removal slot.
4. After prying out, insert the shielded cable through the outlet hole, and connect the shielded cable at the terminal on the back of the wiring base according to the wiring diagram.
5. Restore after wiring. The direction of the wiring seat can be changed if needed.
6. Ensure the outer diameter of the cable used is within the allowable range of the sleeve.
7. Ensure the cable is firmly installed in the sleeve without gap.
8. Install the socket properly to ensure the specified level of protection (IP65).

3.3 Threaded Joint and Process Connection

The default process connection is M20x1.5. Other options like G1/2, G1/4, NPT1/2, NPT1/4 are available. Ensure the chosen thread matches your system's requirements. Custom flange connections are also supported.

Figure 4: Dimension diagram for M20*1.5 threaded joint.

4. Operation

Once properly installed and wired, the pressure transmitter will begin measuring pressure and outputting the corresponding signal. For models with an LCD display, the measured pressure will be shown directly on the screen.

4.1 Output Signal Interpretation

• 4-20mA: Current output, commonly used in industrial control systems.
• 0-10V / 0-5V / 0-3.3V: Voltage outputs, suitable for various data acquisition and control applications.
• RS485: Digital communication interface, often supporting MODBUS protocol for networking applications and digital compensation.

Figure 5: Example of a pressure sensor with 0-3.3V LCD display.

The transmitter is designed for high sensitivity and fast response, ensuring precise operation for pressure control applications.

Figure 6: High sensitivity and fast response for precise operation.

5. Maintenance

The QDW90A-G pressure transmitter is built for durability and stable performance. Regular checks and proper handling will ensure its long lifespan.

• Environmental Conditions: Ensure the ambient temperature remains within -40°C to 85°C.
• Process Medium: Verify that the measured medium is compatible with stainless steel (316L internal sensor).
• Connection Integrity: Periodically inspect all electrical and process connections for tightness and signs of wear or corrosion.
• Cleaning: Keep the exterior of the transmitter clean. Avoid using harsh chemicals that could damage the housing or seals.
• Calibration: While the device features precise calibration and digital compensation, periodic re-calibration by qualified personnel may be necessary for applications requiring extreme accuracy over extended periods.

Figure 7: Enhanced circuit board for improved electromagnetic compatibility (EMC).

Figure 8: Quality assurance processes including gel encapsulation, laser marking, and precise calibration.

6. Troubleshooting

If you encounter issues with your pressure transmitter, consider the following common troubleshooting steps:

For complex issues or if troubleshooting steps do not resolve the problem, please contact customer support.

7. Specifications

The following table details the technical specifications for the QDW90A-G High Temperature Pressure Transmitter:

Figure 9: Comprehensive technical specifications.

Figure 10: Product size and dimension diagrams for different models.

8. User Tips

• When selecting a model, confirm the required range, power supply, pressure type, output signal, precision class, and thread specification to ensure accurate selection for your application.
• For applications involving high temperatures, consider models with spring-tube radiators for better cooling effect.
• If you require a specific thread type other than M20*1.5, ensure to specify it during purchase.
• The wide voltage supply (9-30V) offers flexibility, but using a stable DC24V source is generally recommended for optimal performance.

9. Warranty and Support

This product is certified with CE, FCC, and RoHS, ensuring compliance with international quality and safety standards.

Figure 11: Authoritative certifications and quality assurance processes.

For technical assistance, troubleshooting beyond the scope of this manual, or warranty claims, please contact Qidian Automation Co., Ltd Store directly. Provide your product model number (QDW90A-G) and a detailed description of the issue for efficient support.

10. Product Video