Electric deadweight tester YUNYI7000

pneumaticprecision 10-5with motorization/visualization

Overview
The YUNYI7000 Series fully automatic piston manometer integrates a servo-controlled pressure generation system with a pneumatic binary automatic weight-loading subsystem to provide unattended pressurization and high-precision pressure reference. The automatic weight-loading mechanism removes manual handling of weights and reduces operator-induced errors while improving calibration repeatability and throughput.

Application
Designed for calibration laboratories and metrology institutes, the instrument calibrates precision pressure gauges, pressure sensors and pressure transmitters. The device under test (DUT) is connected to the manometer and compared at defined pressure points to determine measurement error and ensure traceable quantity transmission.

Applicable Verification Regulations

• JJG59-2022 – Liquid Piston Manometer Verification Regulation
• JJG99-2022 – Weight Verification Regulation

Construction & Features

• Subsystems: Intelligent Pressure Generation System and Automatic Binary Weight Loading System.
• Automatic Weight Loading: Binary-code weight scheme reduces the number of physical weights and minimizes failure points.
• Pneumatic Drive: Each T-type concentric weight is driven by an independent cylinder and solenoid valve; 5 mm stroke; synchronized operation; load/unload ≤5 s.
• Dust Cover: Full enclosure protects weights from dust and humidity for long-term stability.
• Direct-Lift Mechanism: Dedicated pneumatic cylinder per weight with rubber-contact trays to reduce wear and improve repeatability.
• Integrated Sensors: Built-in temperature, humidity, rotation speed and displacement sensors for continuous piston-system monitoring.
• Piston Materials & Protection: Piston, protective shaft and piston rod in tungsten carbide with patented anti-breakage protection.
• Modular Design: Modular piston assemblies for easy installation, inspection and transport; flight-grade carrying case provided.
• Reliability: Reduced moving parts for simplified maintenance and high operational reliability.

Intelligent Pressure Generation System

• Pressure Generation: Servo motor synchronized with the piston cylinder for precise, stable pressure output.
• Touchscreen Interface: 10.1-inch touchscreen for control of pressure generation, weight loading, test procedures, data logging and display.
• Pressure Output: Single pressure output port with M20×1.5 thread (supports manifold expansion).
• Communication: RS485 or Ethernet for remote control and integration.
• Stabilization Time: System pressure stabilization ≤120 s.
• Built-in Drain: Integrated drain to prevent pipeline blockage.
• Power Supply: AC 220±10 V, 50 Hz.

Data Acquisition & Monitoring Software

• Supports manual and automatic calibration modes via workstation or PC running the fully automatic pressure testing software.
• C/S architecture with real-time HMI showing status parameters, measurements and alarms.
• 3D visualization: dynamic 3D model of key components (weights, piston) that mirrors the actual device.
• Functions: verification procedures, data query, system settings, alarms and secure data storage for both static and dynamic records.

Advantages of Binary Weight Loading

• Simplified operation using bit weights (e.g., 1g, 2g, 4g, 8g) reduces handling and cumulative error.
• Fast determination of required weight combinations due to binary regularity, saving configuration time.
• Precise value matching enabled by fine-grained binary combinations.
• Expandable and compatible: additional bit weights can extend range or integrate with other binary-based metrological systems.

Technical Specifications (table)
Model | Pressure Range | Accuracy | Minimum Weight (incl. base)
YUNYI7006 | 0.06 – 0.6 MPa | 0.005% | 0.06 MPa
YUNYI7060 | 0.1 – 6 MPa | 0.005% | 0.1 MPa
YUNYI7600 | 1 – 60 MPa | 0.005% | 1 MPa
YUNYI7250 | 5 – 250 MPa | 0.005% | 5 MPa

Other Specifications

• Working Medium: Diisooctyl sebacate; kinematic viscosity 20–25 mm²/s at 20°C; acid value ≤0.05 mgKOH/g.
• Weight Material: 304 non-magnetic stainless steel.
• Piston Material: Tungsten carbide (rod and cylinder).
• Weight Correction: Gravity acceleration correction configurable per user location.
• Installation & Environment: Operating temperature 20 ± 10 °C; relative humidity ≤80%; place on stable, vibration-free bench free from electromagnetic interference.

Specifications Summary

• Series: YUNYI7000 Series
• Accuracy: 0.005% (models as listed)
• Pressure output thread: M20×1.5
• Weight load/unload time: ≤5 s
• Pressure stabilization time: ≤120 s
• Touchscreen: 10.1-inch
• Communication: RS485 or Ethernet
• Power supply: AC 220±10 V, 50 Hz
• Piston & rod material: Tungsten carbide
• Weight material: 304 non-magnetic stainless steel
• Working medium: Diisooctyl sebacate