YDWOPT WG-DCZ Low-Temperature Constant-Temperature Bath

Overview

The YDWOPT WG-DCZ Low-Temperature Constant-Temperature Bath is a precision-engineered circulating thermal bath designed for laboratory environments requiring stable, uniform temperature control across a broad operational range (4 °C to 95 °C). It operates on the principle of active dual-mode thermal regulation—integrating high-efficiency compression-based refrigeration and resistive heating within a single compact chassis—to deliver rapid thermal response and long-term stability. The system employs a microprocessor-controlled PID algorithm with auto-tuning capability, coupled with a certified Pt100 platinum resistance thermometer for real-time feedback. This architecture ensures temperature stability of ±0.1 °C in aqueous media—a specification validated under steady-state conditions per ISO/IEC 17025-aligned internal calibration protocols. Its sealed hermetic compressor (imported origin) enables reliable sub-ambient operation without performance degradation over extended duty cycles, making it suitable for integration into temperature-sensitive analytical workflows such as refractometry, viscometry, and spectrophotometric cell conditioning.

Key Features

• Microprocessor-based PID temperature controller with self-tuning functionality for adaptive response to load changes and ambient fluctuations
• Pt100 sensor (IEC 60751 Class A) embedded in stainless-steel probe for high-accuracy, drift-resistant measurement
• Dual-mode thermal management: simultaneous heating and cooling capacity enables precise setpoint tracking across full 4–95 °C range
• External recirculation pump (4 L/min flow rate, max head 0.3 bar) with corrosion-resistant wetted parts compatible with water and low-viscosity organic solvents
• Integrated safety protections: thermocouple failure detection, upper/lower temperature limit alarms, and overcurrent cutoff
• Compact footprint (360 × 400 × 265 mm) and lightweight design (12 kg net) optimized for benchtop deployment in regulated lab spaces
• Front-panel LED display with 0.1 °C resolution and intuitive menu navigation compliant with IEC 61000-6-2 EMC standards

Sample Compatibility & Compliance

The WG-DCZ is engineered for compatibility with standard laboratory accessories including Abbe refractometers (e.g., SGW-732, WYA-3S, WYA-2S), viscometer jackets, and UV-Vis cuvette holders requiring external thermal coupling. Its 2 L stainless-steel inner tank supports both water and low-toxicity heat-transfer fluids (e.g., ethylene glycol/water mixtures up to 30% v/v), though fluid selection must comply with ASHRAE Guideline 15 and local chemical handling regulations. The unit meets CE marking requirements under Directive 2014/30/EU (EMC) and 2014/35/EU (LVD), and its electrical insulation conforms to IEC 61010-1:2010 for Safety of Electrical Equipment for Measurement, Control, and Laboratory Use. While not inherently 21 CFR Part 11 compliant, audit-ready operation is achievable when paired with validated external data logging systems supporting electronic signature and change-tracking protocols.

Software & Data Management

The WG-DCZ operates as a standalone analog-digital hybrid instrument with no embedded firmware-based data export or remote interface. All operational parameters—including setpoint, actual temperature, and status flags—are displayed locally via the front-panel interface. For traceable temperature monitoring in GLP/GMP environments, users may integrate third-party USB or RS-232 data loggers (e.g., Omega OM-DAQPRO-5300 series) connected to the optional analog output port (0–5 V DC proportional to temperature). Calibration records—including sensor verification, stability tests, and maintenance logs—must be maintained manually per ISO/IEC 17025 Clause 6.4.2. Firmware updates are not supported; hardware-level recalibration requires authorized service centers using NIST-traceable reference standards.

Applications

• Thermal conditioning of optical components in refractometry and polarimetry, ensuring index-of-refraction reproducibility per ASTM D1218 and ISO 2859
• Temperature stabilization of sample cells in UV-Vis and FTIR spectroscopy to minimize baseline drift and thermal artifact interference
• Controlled-temperature environment for viscosity measurements using capillary or rotational viscometers (ASTM D445, ISO 3104)
• Stabilization of enzymatic reaction vessels in biochemical assay development where thermal uniformity directly impacts kinetic parameter accuracy
• Pre-conditioning of calibration standards (e.g., certified reference materials for thermal expansion or density) prior to metrological evaluation
• Supporting QC/QA workflows in pharmaceutical manufacturing for dissolution apparatus temperature verification (USP )

FAQ

What is the recommended maintenance interval for the WG-DCZ bath?
Routine inspection—including visual check of coolant level, pump impeller integrity, and sensor cable continuity—is advised every 1000 operating hours or quarterly, whichever occurs first. Full compressor performance validation and Pt100 calibration verification should be performed annually by an accredited service provider.
Can the WG-DCZ be used with silicone oil or other high-boiling-point media?
No. The system is validated exclusively for water and water-glycol mixtures (≤30% v/v). Use of silicone oil or mineral oils exceeds thermal and material compatibility limits specified in the manufacturer’s technical documentation and voids warranty coverage.
Is external circulation tubing included with the instrument?
Standard delivery includes one pair of 1.5 m silicone rubber hoses (inner diameter 6 mm, outer diameter 10 mm) with quick-connect fittings. Additional lengths or chemically resistant alternatives (e.g., PTFE-lined) must be sourced separately.
Does the unit support RS-485 or Ethernet connectivity for lab network integration?
No. The WG-DCZ lacks digital communication ports. Integration into centralized lab infrastructure requires external analog-to-digital converters or programmable logic controllers interfacing via its 0–5 V analog output signal.
How is temperature uniformity verified inside the bath chamber?
Uniformity is assessed per ASTM E2203 using a 3-point probe array (center + two diagonally opposite corners at mid-depth) during stabilized operation. Deviation across the working volume must remain ≤±0.2 °C to meet specification claims.