MingShen Science WSWK-5 Microcomputer-Based Temperature Data Logger and Programmable Controller

Overview

The MingShen Science WSWK-5 Microcomputer-Based Temperature Data Logger and Programmable Controller is a dedicated thermal process automation instrument engineered for precise time-temperature profiling in high-temperature industrial furnaces. It implements closed-loop temperature control using a microcontroller-based architecture with digital PID regulation and phase-angle-triggered silicon-controlled rectifier (SCR) output, enabling stable and repeatable thermal ramping, soaking, and cooling sequences. Designed to meet national standard requirements for coal analysis procedures—including rapid ashing (GB/T 212), slow ashing, volatile matter determination (GB/T 212), and Roga index testing—the WSWK-5 delivers deterministic thermal program execution without manual intervention. Its core function extends beyond logging: it actively regulates furnace power in real time based on thermocouple feedback, making it a hybrid controller/logger rather than a passive recorder. The instrument operates exclusively with Type K thermocouples, supporting measurement up to 1200 °C, and features automatic zero-point correction and cold-junction compensation to maintain traceability under variable ambient conditions.

Key Features

• Integrated PID temperature control with phase-angle SCR output driving capability for direct 5 kW resistive load management
• Programmable multi-step thermal profiles with up to 999-minute total duration and auto-scaling time resolution (1 s / 10 s / 1 min)
• Digital touch-key interface with intuitive menu navigation—no physical dials or analog adjustments required
• Real-time temperature display with 1 °C resolution and calibrated accuracy of ±3 °C across the full operating range
• Self-diagnostic startup sequence verifying thermocouple continuity, power supply stability, and control loop integrity
• Benchtop-fixed mechanical design (330 × 290 × 120 mm) optimized for integration into standardized lab furnace enclosures
• Low standby power draw (10 W) and robust EMI-hardened circuitry suitable for industrial laboratory environments

Sample Compatibility & Compliance

The WSWK-5 is purpose-built for solid-sample thermal processing applications where reproducible heating schedules are critical—primarily coal, coke, biomass, and ceramic precursors subjected to standardized ASTM D3174, ISO 1171, GB/T 212, and GB/T 5447 test methods. It complies with IEC 61000-6-2 (immunity) and IEC 61000-6-4 (emissions) for industrial environments. While not certified to FDA 21 CFR Part 11 or EU Annex 11, its deterministic program execution, non-volatile parameter storage, and hardware-enforced timer/temperature interlocks support GLP-aligned documentation practices when paired with external audit-trail-capable data acquisition systems. All firmware logic follows deterministic finite-state machine architecture—no floating-point arithmetic or dynamic memory allocation—to ensure cycle-to-cycle repeatability.

Software & Data Management

The WSWK-5 operates as a standalone embedded system with no PC dependency. Configuration, program entry, and real-time monitoring occur exclusively via the front-panel touch interface. Thermal programs are stored in EEPROM with write-protection against accidental overwrite. No proprietary software, drivers, or cloud connectivity are provided or required. Data logging occurs internally with timestamped temperature readings at user-defined intervals; however, raw log export requires optional RS-485 interface module (sold separately) and third-party Modbus RTU-compatible SCADA or LabVIEW integration. Audit-ready operation is supported through immutable parameter lockout mode and power-failure-resilient program retention.

Applications

• Automated execution of coal proximate analysis per GB/T 212 (ash, volatile matter, fixed carbon)
• Standardized Roga index (GB/T 5447) and crucible swelling number (CSN) thermal cycles
• Controlled calcination of catalyst supports, battery cathode precursors, and refractory materials
• Calibration verification of muffle furnaces and tube furnaces using NIST-traceable reference thermocouples
• QA/QC thermal validation in cement clinker processing and metallurgical sintering pilot lines
• Research-grade thermal gravimetric pre-conditioning where open-loop timing suffices but closed-loop temperature fidelity is mandatory

FAQ

Does the WSWK-5 support multiple thermocouple types?
No—it is factory-configured for Type K thermocouples only. Input circuitry, cold-junction compensation, and linearization tables are hard-coded for K-type characteristics.
Can I export logged temperature data directly to USB or SD card?
No. Internal logging is non-volatile but not user-accessible without an RS-485 communication module and external host system.
Is the PID tuning adjustable by the end user?
Yes—proportional band, integral time, and derivative time parameters are accessible in engineering setup mode, though default values are optimized for typical furnace thermal mass and lag profiles.
What safety protections are built into the control output stage?
Over-temperature cutoff (configurable setpoint limit), SCR overcurrent shutdown, open-circuit thermocouple detection, and 24-hour watchdog timer forcing safe power-down if communication or sensor faults persist.
Does the instrument comply with electromagnetic compatibility (EMC) standards for laboratory use?
Yes—it meets IEC 61000-6-2 (industrial immunity) and IEC 61000-6-4 (emission limits) for Class A equipment, validated during type testing in accredited EMC laboratories.