Overview

The HPI-100 is a pressure measurement and control unit designed to monitor tank pressure and convert it into tank level data. It communicates with a Master Unit via MODBUS RTU protocol and includes relay control functionality for solenoid valve operation.

1. Safety Information (p.3-4)

• Electrical Hazards:
  • Always isolate power before installation or maintenance.
  • High-voltage components are present; improper handling may lead to injury.
• Electrostatic Discharge (ESD) Precautions:
  • Avoid static electricity discharges that can damage electronic components.
  • Handle Printed Circuit Boards (PCBs) with care and use conductive packaging.
  • DO NOT remove or install PCBs while power is applied.

2. Storage Before Installation (p.5)

• Store the equipment in a dry, sheltered area to prevent moisture and temperature damage.
• Before installation, check for:
  • Bent or damaged components.
  • Scratches, dents, or other physical deformities.
  • Damaged connectors, leads, or PCBs.

3. System Description (p.6)

• The HPI-100 measures up to 24 tank pressures and converts them into tank levels.
• Equipped with a 24-bit A/D converter for high-precision measurements.
• Communicates via RS-485 MODBUS RTU protocol.
• Features relay control for solenoid valves.
• LCD Display shows real-time tank level readings.

4. Technical Specifications (p.6-7)

• Measurement Channels: 24 individual tank inputs.
• Accuracy: ±0.02mH₂O full scale.
• Power Supply: 24V DC (0.03A without relay/solenoid activation).
• Input Type Scaling: 0.000 ~ 42.000mA (mH₂O equivalent).
• Communication: RS-485, 2-wire (A, B), MODBUS RTU.
• Operating Temperature: -5°C to +55°C.
• Storage Temperature: -20°C to +70°C.
• Weight: Approx. 265g.

5. Configuration & Settings (p.8-13)

• MODBUS Slave Address Setting: Each HPI-100 unit must have a unique address (0x20 - 0xFF).
• Input Channel Number Setting: Supports up to 24 input channels.
• Relay Delay Time Configuration: Adjustable between 0 - 999 seconds.
• Password Management: Default 0000, user changeable.
• Back Pressure Compensation: Adjustable per channel (e.g., 10cmH₂O offset).
• Calibration: Factory pre-set, user adjustments not required.
• LCD Display Test & Brightness Adjustment: Ensures proper display functionality.
• Channel Hold Mode: Locks display to a single channel instead of auto-scrolling.

6. Communication Parameters (p.13-14)

• Baud Rate: 9600bps.
• Data Bits: 8-bit.
• Stop Bit: 1-bit.
• Parity: None.
• Supported MODBUS Commands:
  • Read tank level.
  • Adjust calibration settings.
  • Modify relay control parameters.

7. Revision History (p.14-15)

• Version R4 (2025.03.03) – Fourth revision of the technical manual.