1. Product Overview
The INSTRUKART AI-DP1-LCD is a digital differential pressure indicator designed for precise measurement in various controlled environments. It serves as a modern replacement for traditional analog Magnehelic gauges, offering enhanced readability and functionality.
Key applications include laminar airflow cabinets, clean rooms, biosafety cabinets, and Air Handling Units (AHU). The device features a clear Graphic Backlit 128 x 64 LCD for easy data visualization and includes a built-in sensor for accurate readings.
Figure 1: Front view of the AI-DP1-LCD Differential Pressure Indicator, showing the LCD display and 'ACK' button.
Features:
- Digital Readout: Clear Graphic Backlit 128 x 64 LCD display.
- Integrated Sensor: Built-in high-speed differential pressure sensor.
- Buzzer Alarm: High and low buzzer alarm for process set parameter violation with acknowledgment key.
- Unit Conversion: Ability to convert between mm.w.c. and Pascals (factory fixed selection).
- Offset Provision: To meet audit requirements.
- Communication: Isolated RS485 Modbus Protocols for BMS / SCADA / PLC integration.
- Construction: M.S. Powder Coated Body (back) with Stainless Steel Front Flush Plate for modular wall fitment.
- Medium: Suitable for air or non-corrosive gases.
2. Safety Information
Please read this manual carefully before operating the device. Failure to follow instructions may result in inaccurate readings or damage to the unit.
- Ensure the device is powered by a 24V DC supply as specified.
- Only use the device with air or non-corrosive gases.
- Do not exceed the maximum over pressure of 4 times the rated pressure.
- Installation and maintenance should be performed by qualified personnel.
- Keep the device away from excessive moisture, dust, and extreme temperatures.
3. Setup and Installation
The AI-DP1-LCD is designed for modular wall fitment, typically in cleanroom environments. Proper installation ensures accurate readings and device longevity.
Figure 2: Side and front views illustrating the physical connections and mounting points.
3.1 Mounting:
- The device features a Stainless Steel Front Flush Plate for seamless integration into modular walls.
- Ensure adequate depth (Instrument Enclosure is 100×90×30 mm W×H×D) is available for proper fitment.
- Secure the unit firmly using appropriate fasteners for the wall material.
3.2 Electrical Connections:
- Connect the device to a stable 24V DC power supply.
- For RS485 Modbus communication, connect the appropriate wiring to the isolated RS485 ports at the back of the unit. Refer to your BMS/SCADA/PLC system documentation for specific wiring diagrams.
3.3 Pressure Connections:
- Two 4mm stainless steel hose nipples are located at the back of the unit for pressure input.
- Connect appropriate tubing from the pressure source to these nipples. Ensure connections are secure and leak-free.
- Verify that the medium being measured is air or a non-corrosive gas.
4. Operating Instructions
Once installed and powered, the AI-DP1-LCD will display differential pressure readings on its LCD screen.
4.1 Power On:
Upon applying 24V DC power, the device will initiate and display the current differential pressure. The backlit LCD ensures visibility in various lighting conditions.
4.2 Reading Display:
The 128 x 64 LCD will show the differential pressure value. The unit of measurement (mm.W.C or Pascals) is factory-fixed. The display also shows the date and time.
4.3 Alarm Functionality:
- The device features a built-in buzzer alarm for high and low process set parameter violations.
- If the measured differential pressure falls outside the configured high or low limits, the buzzer will activate.
- Press the ACK button (located below the display) to acknowledge and silence the alarm.
4.4 Offset Provision:
The device includes an offset provision to meet audit requirements. Consult the detailed technical documentation or contact INSTRUKART support for instructions on configuring and utilizing this feature.
5. Maintenance
Regular maintenance ensures the accuracy and longevity of your AI-DP1-LCD unit.
- Cleaning: Gently clean the display and exterior with a soft, damp cloth. Do not use abrasive cleaners or solvents.
- Calibration: The device comes with a factory calibration certificate. Periodic re-calibration by certified professionals is recommended to maintain accuracy, especially in critical applications.
- Connection Check: Periodically inspect all electrical and pressure connections for tightness and integrity.
- Environmental Conditions: Ensure the operating environment remains within specified temperature and humidity ranges to prevent damage.
6. Troubleshooting
This section provides basic troubleshooting steps for common issues. For more complex problems, contact INSTRUKART technical support.
6.1 No Display/Power:
- Verify that the 24V DC power supply is correctly connected and functioning.
- Check all power cables for damage or loose connections.
6.2 Inaccurate Readings:
- Ensure pressure connections are secure and free of leaks.
- Verify that the tubing is not kinked or obstructed.
- Confirm that the measured medium is air or a non-corrosive gas.
- Consider if re-calibration is due.
6.3 Alarm Constantly Active:
- Check if the differential pressure is genuinely outside the set high/low limits.
- Press the ACK button to acknowledge the alarm. If it immediately reactivates, the condition persists.
- Review the alarm set points to ensure they are appropriate for the application.
6.4 RS485 Communication Issues:
- Verify RS485 wiring connections and polarity.
- Check Modbus address and baud rate settings on both the indicator and the master device (BMS/SCADA/PLC).
- Ensure proper termination resistors are used if required by the network.
7. Specifications
Detailed technical specifications for the INSTRUKART AI-DP1-LCD Differential Pressure Indicator.
| Parameter | Value |
|---|---|
| Measuring Ranges | -0.72 to +0.72 In.WC / -180 to 180 Pascals |
| Accuracy | ±0.5% of Full Scale |
| Display | Graphic Backlit 128 x 64 LCD |
| Maximum Over Pressure | 4 Times the rated pressure |
| Sensors | Integrated High Speed Differential Pressure Sensor |
| Power Supply | 24V DC Typical |
| Alarms | Built-in High & Low Buzzer Alarm with Acknowledgment Key |
| Construction (Back) | M.S. Powder Coated Body |
| Construction (Front) | Stainless Steel Front Flush Plate |
| Communication | Isolated RS485 Modbus Protocols |
| Pressure Connection | 2 Nos. Hose Nipples of 4mm Stainless Steel at the Back |
| Medium | Air or Gases (Non-Corrosive) |
| Dimensions (W×H×D) | 100 × 90 × 30 mm |
| Unit Selection | Factory Fixed (mm.W.C / Pascals) |
| Item Weight | 1.21 Pounds |
Figure 3: Product information sheet detailing features and specifications.
8. Applications
The INSTRUKART AI-DP1-LCD is suitable for a wide range of critical environments requiring precise differential pressure monitoring.
- Infection Rooms
- Hospital Operation Theatre (OT) rooms
- Isolation Rooms (especially where negative pressure is required)
- Laminar Air Flow Cabinets
- Pharmaceutical Clean Rooms
- HVAC Systems
- Bio Safety Cabinets
- Air Handling Units (AHUs)
Figure 4: Visual representation of various applications for the AI-DP1-LCD.
9. Warranty and Support
The INSTRUKART AI-DP1-LCD comes with a factory calibration certificate, ensuring its accuracy at the time of purchase. For specific warranty terms and conditions, please refer to the documentation provided with your purchase or contact INSTRUKART directly.
9.1 Technical Support:
For technical assistance, troubleshooting beyond this manual, or inquiries regarding customization, please contact INSTRUKART customer support. Contact information can typically be found on the manufacturer's website or on the product packaging.
Note: This manual is intended as a guide. Specifications and features are subject to change without prior notice. Always refer to the latest documentation provided by the manufacturer.
