Hengping CH2015 Advanced Circulating Constant-Temperature Bath

Overview

The Hengping CH2015 Advanced Circulating Constant-Temperature Bath is an engineered thermal management system designed for precision temperature control in laboratory and industrial R&D environments. Based on a robust single-chip microprocessor architecture with self-tuning PID algorithm, the unit delivers high reproducibility in thermal regulation across its full operating range—from ambient +20 °C up to 200 °C. Temperature sensing is performed via a calibrated Pt100 platinum resistance thermometer, ensuring traceable accuracy and long-term stability. Unlike open-bath water baths or basic heating mantles, the CH2015 integrates an internal circulation pump to promote uniform thermal distribution throughout the 15-liter working chamber, minimizing axial and radial temperature gradients. Its sealed, insulated stainless-steel inner tank supports consistent heat retention and reduces evaporation—critical for extended-duration experiments requiring stable thermal conditions over hours or days. The bath is optimized for applications demanding ISO/IEC 17025-compliant thermal environments, including calibration of temperature-sensitive sensors, viscosity measurements, and thermal aging studies under controlled heating protocols.

Key Features

• Self-tuning PID temperature controller with real-time adaptive adjustment for minimal overshoot and rapid stabilization
• Pt100 RTD sensor with NIST-traceable calibration path and 0.1 °C digital display resolution
• Internal recirculation system ensuring ≤±0.05 °C temperature uniformity across the entire 15 L working volume
• Stainless-steel inner tank (304 grade) with corrosion-resistant finish, compatible with water, silicone oil, and low-viscosity heat-transfer fluids
• Heating-only configuration with 1.8 kW high-efficiency resistive heating elements and over-temperature safety cutoff
• Compact footprint (370 × 340 × 480 mm) suitable for benchtop integration in QA/QC labs, university teaching facilities, and pilot-scale process development suites

Sample Compatibility & Compliance

The CH2015 accommodates standard laboratory vessels—including beakers, flasks, reaction kettles, and immersion probes—up to 200 mm in height. Its open-top design allows direct access for sample insertion, thermocouple placement, or integration with external equipment (e.g., rheometers, spectrophotometers). While not rated for pressurized operation or cryogenic use, it meets general-purpose thermal stability requirements outlined in ASTM E220, ISO 17025 Clause 6.4.3 (environmental monitoring), and USP for thermal validation of analytical systems. It is routinely deployed in GLP-regulated settings where documented thermal consistency is required for method qualification—particularly in pharmaceutical excipient testing, polymer melt index determination, and food thermal stability assays per AOAC 985.23.

Software & Data Management

The CH2015 operates as a standalone analog-digital hybrid instrument without embedded data logging or PC connectivity. However, its analog voltage output (0–5 V DC proportional to measured temperature) enables seamless integration with third-party DAQ systems (e.g., National Instruments USB-6009, Keysight 34972A) for time-stamped temperature recording, alarm triggering, and audit-trail generation compliant with FDA 21 CFR Part 11 when paired with validated software platforms. Users may configure external logging intervals from 1 second to 60 minutes. For GMP environments, periodic verification using calibrated reference thermometers (e.g., Fluke 1523 with dry-block calibrator) is recommended at three points within the operational range (e.g., 40 °C, 100 °C, 180 °C) per SOP-TEMP-002.

Applications

• Calibration of thermocouples, RTDs, and infrared thermometers against reference standards
• Thermal conditioning of viscometers, densitometers, and refractometers prior to measurement
• Accelerated stability testing of pharmaceutical formulations per ICH Q1A(R3)
• Controlled heating of enzymatic reaction mixtures in molecular biology workflows
• Pre-conditioning of polymer samples prior to DSC or TGA analysis
• Temperature-dependent solubility studies in formulation development

FAQ

Is the CH2015 suitable for oil-based heat transfer media?
Yes—the stainless-steel chamber and internal pump are chemically compatible with silicone oils and mineral oils up to 200 °C; ensure fluid viscosity remains below 100 cSt at operating temperature.
Does it support external temperature probe input for cascade control?
No—the unit uses only its integrated Pt100 sensor; external probe inputs are not supported.
What maintenance is required to sustain ±0.05 °C stability?
Biannual cleaning of the heater housing and fan vents is recommended; replace thermal insulation gaskets every 36 months if used continuously above 150 °C.
Can it be used in a fume hood?
Yes, provided ambient airflow does not exceed 0.5 m/s across the bath opening—excessive draft degrades temperature uniformity and increases power demand.
Is firmware upgrade capability available?
No—control logic is hard-coded in the microcontroller; functional updates require hardware revision (e.g., CH2015-V2 with RS485 interface).