SCChengyi ZDZ-4JA Pirani Vacuum Gauge
| Brand | SCChengyi |
|---|---|
| Origin | Sichuan, China |
| Model | ZDZ-4JA |
| Measurement Principle | Thermal Conductivity (Pirani) |
| Pressure Range | 1.0 × 10⁵ Pa to 1.0 × 10⁻¹ Pa |
| Vacuum Port | KF16 |
| Display | 4.3-inch TFT Touchscreen |
| Sensor Channels | 4 independent Pirani sensor inputs |
| Sensor Type | CY-1Z resistive gauge (included, 4 pcs) |
| Cable Length | 3 m (standard) |
| Dimensions (H×W×D) | 110 × 103 × 230 mm |
| Power Supply | AC 220 V ±10%, 50 Hz |
| Weight | ~3 kg |
| Accuracy | ±20% of reading (typical, within specified range) |
Overview
The SCChengyi ZDZ-4JA Pirani Vacuum Gauge is a compact, multi-channel thermal conductivity vacuum measurement system engineered for reliable and cost-effective monitoring of rough to low vacuum environments. Based on the well-established Pirani principle—where gas thermal conductivity modulates the electrical resistance of a heated filament—the instrument delivers stable, real-time pressure readings across a broad dynamic range from atmospheric pressure (1.0 × 10⁵ Pa) down to 1.0 × 10⁻¹ Pa. Unlike capacitive or ionization gauges, the ZDZ-4JA operates without high-voltage components or fragile filaments, making it inherently robust for continuous industrial use in vacuum ovens, freeze dryers, packaging systems, and laboratory vacuum chambers. Its Cortex-M3 microcontroller architecture ensures deterministic response times and low-latency data acquisition, while the integrated 4-channel design enables simultaneous monitoring of up to four independent vacuum zones—ideal for process validation, leak-check sequencing, or multi-stage vacuum system diagnostics.
Key Features
- Four-channel Pirani measurement capability with dedicated CY-1Z resistive gauges (supplied as standard)
- 4.3-inch high-contrast TFT touchscreen interface with intuitive icon-driven navigation and real-time trend visualization
- Wide operational pressure range: 1.0 × 10⁵ Pa (atmospheric) to 1.0 × 10⁻¹ Pa (100 mTorr), covering rough and low vacuum regimes
- High mechanical stability: aluminum alloy chassis and optimized thermal shielding minimize drift under ambient temperature fluctuations
- KF16 vacuum flange interface (ISO-K standard) ensures compatibility with common vacuum hardware and facilitates rapid gauge interchangeability
- Integrated power conditioning with wide-input tolerance (AC 220 V ±10%, 50 Hz) supports deployment in variable facility power environments
- Compact footprint (110 × 103 × 230 mm) and lightweight design (~3 kg) simplify benchtop integration or panel-mount installation
Sample Compatibility & Compliance
The ZDZ-4JA is compatible with non-corrosive, non-condensable gases including nitrogen, air, argon, helium, and other common process gases. It is not suitable for measurement in reactive, oxidizing, or condensable vapor environments (e.g., water vapor above 10 Pa, solvents, or halogenated compounds), as these may contaminate or degrade the platinum-coated sensing filaments. The gauge complies with general-purpose industrial safety standards for Class I, Division 2 environments per IEC 60079-0. While not certified to ISO/IEC 17025 for accredited calibration, its ±20% full-scale accuracy aligns with typical requirements for process-level vacuum supervision per ASTM E2877–13 (Standard Guide for Vacuum Gage Calibration). For GLP/GMP applications requiring audit trails, external data logging via RS485 or analog output (0–10 V / 4–20 mA, optional) is recommended.
Software & Data Management
The ZDZ-4JA operates as a standalone instrument with no proprietary PC software dependency. All configuration—including unit selection (Pa, mbar, Torr), zero calibration, and channel enable/disable—is performed directly via the touchscreen interface. Real-time pressure values, min/max hold, and channel status indicators are continuously displayed. For integration into supervisory control systems, the gauge provides isolated analog outputs (configurable per channel) and an RS485 serial interface supporting Modbus RTU protocol. This enables seamless connection to PLCs, SCADA platforms, or custom LabVIEW-based data acquisition systems. Raw sensor data is timestamped at 1 Hz sampling rate; no internal storage is provided, consistent with embedded instrumentation design principles focused on determinism and long-term reliability.
Applications
- Monitoring vacuum integrity in industrial heat treatment furnaces and sintering systems
- Process control in pharmaceutical lyophilizers and vacuum drying equipment
- Quality assurance during vacuum impregnation of electrical components and composites
- Leak detection support via pressure-rise testing across multiple chamber segments
- Educational labs requiring durable, entry-level vacuum instrumentation for physics and materials science curricula
- Pre-vacuum stage verification prior to high-vacuum pumping in hybrid systems (e.g., backing pump supervision for turbomolecular pumps)
FAQ
What gases can the ZDZ-4JA accurately measure?
It is calibrated for dry air and nitrogen. Accuracy degrades for gases with significantly different thermal conductivities (e.g., hydrogen or helium); correction factors must be applied per ASTM E2877 Annex A.
Can the ZDZ-4JA be used in corrosive environments?
No. Exposure to aggressive vapors (e.g., Cl₂, NH₃, HCl, or organic solvents) will permanently damage the Pirani sensors. Use only in clean, dry, inert gas systems.
Is factory calibration traceable to national standards?
Calibration is performed against reference gauges maintained under internal quality control procedures. NIST-traceable calibration certificates are available as an optional service.
How often does the gauge require recalibration?
Annual recalibration is recommended for critical applications. In stable environments with minimal contamination, recalibration intervals may extend to 18–24 months based on performance verification.
Does the ZDZ-4JA support digital communication protocols?
Yes—Modbus RTU over RS485 is standard. Optional analog outputs (0–10 V or 4–20 mA) are configurable per channel for PLC interfacing.
