1. Product Overview

2. Core Specifications

• Number of Channels: 4 channels, supporting independent pressure monitoring for four separate pistons
• Sensor Type: Accepts input signals from piezoelectric pressure sensors
• Measurement Range: 0-10,000 psi (approximately 0-689 bar)
• Accuracy: ±0.25% FS (Full Scale)
• Resolution: 0.01% FS (Full Scale)
• Output Signal: 4-20 mA analog output
• Power Supply: 24 VDC ±10%
• Power Consumption: 25 W
• Communication Interface: Supports multiple communication protocols, including RS-485, for seamless integration with host computer systems
• Dimensions: 9.50 x 0.96 x 3.90 inches (approximately 241 x 24 x 99 mm)
• Operating Temperature: -40℃ to 85℃

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3. Product Features

• Automatic Zero Calibration: Equipped with a built-in automatic zero calibration function to maintain stable and reliable measurement accuracy over long-term operation.
• Multi-Mode Data Capture: Supports peak pressure capture, minimum pressure capture, and full-cycle pressure curve capture to meet diverse monitoring demands.
• User-Programmable Alarms: Allows users to set multiple groups of threshold alarms, including high pressure, low pressure, overpressure, and underpressure alarms. The unit triggers protective actions via output signals once thresholds are breached.
• Data Logging: Features integrated data logging capabilities to store critical operating parameters and alarm events. The recorded data supports post-operation analysis, fault diagnosis, and performance evaluation.

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4. Structure and Components

• Input Terminal Block: Used for connecting piezoelectric pressure sensors (PZT) to transmit original pressure signals.
• Signal Processing Unit: Amplifies, filters, and linearizes weak voltage signals generated by the sensors to ensure accurate and stable data output.
• Control Processor: Executes precision measurement algorithms, completes peak value capture, and conducts real-time threshold comparison for alarm triggering.
• Communication & Output Terminal Block: Provides standard 4-20 mA analog output and communication interfaces (such as RS-485) for data transmission and system integration.
• Display and Indicator Lights: Enables local viewing of real-time operating status and clear visual alerts for alarm conditions.

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5. Applications

• Reciprocating Compressors: Ideal for large-scale reciprocating compressors widely used in the petroleum and chemical industries.
• Oil and Gas Industry: Applied to monitor piston pressure in hydraulic systems for well fracturing and related oilfield operations.
• Power and Energy Sector: Used for condition monitoring of compressors and other reciprocating machinery supporting power plant operations.

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6. Installation and Maintenance

• Installation Location: It is recommended to install the unit in a control cabinet near the machine or a rack close to the sensors, ensuring the signal cable length complies with technical manual requirements (typically no more than 5 meters) to minimize signal interference.
• Electrical Connection: Follow the circuit diagram strictly for wiring. Verify correct power polarity to prevent component damage caused by reverse connection.
• Regular Calibration: Despite the built-in automatic zero calibration function, a complete on-site calibration (including full-scale calibration) is recommended every 6 to 12 months to sustain optimal measurement accuracy.
• Cleaning and Upkeep: Keep the module housing clean and free of contaminants. Prevent oil, grease, and dust from entering the terminal area to avoid signal degradation and ensure stable performance.