LAUDA Kryoheater Selecta Process Thermostat

Overview

The LAUDA Kryoheater Selecta Process Thermostat is an industrial-grade temperature control system engineered for precise, stable, and reproducible thermal management across demanding process applications. Based on LAUDA’s proven Kryoheater Selecta (KHS) platform, this series integrates high-efficiency refrigeration, robust heating capability, and intelligent expansion control to deliver continuous, dynamic temperature regulation from –90 °C to +200 °C. Unlike standard laboratory circulators, the Kryoheater Selecta is designed as a process-optimized thermostat—featuring reinforced pressure-rated circulation circuits, nitrogen-compatible sealing, and thermally stable stainless-steel reservoirs—to support closed-loop temperature control in pilot-scale reactors, jacketed vessels, and environmental test rigs. Its operational principle relies on a dual-mode thermal management architecture: a high-torque electric heater provides rapid, linear heating response, while either a dual-stage or cascade refrigeration system enables deep sub-zero cooling with minimal temperature overshoot. The system employs a water-cooled condenser to maintain consistent compressor performance under sustained load, ensuring long-term stability during extended process cycles.

Key Features

• Wide operational temperature range: –90 °C to +200 °C, validated per DIN EN 61000-4-3 and IEC 61000-4-6 electromagnetic compatibility standards
• Cascade refrigeration option (–90 °C minimum) or dual-stage compression (–60 °C minimum), both configured with oil-separation and low-temperature lubricant systems for extended service life
• Stepper-motor-controlled electronic expansion valve enabling real-time refrigerant flow modulation and adaptive partial-load efficiency optimization
• Integrated pressure-rated circulation pump capable of delivering up to 6 bar (gauge) operating pressure when used with nitrogen pressurization—compliant with PED 2014/68/EU requirements for pressurized equipment
• Stainless-steel fluid reservoir and wetted parts (AISI 316L) compatible with common heat transfer fluids including silicone oils, glycol/water mixtures, and specialized low-temperature media
• Touchscreen HMI with preconfigured PID tuning profiles for common process scenarios (e.g., ramp-hold-cool, multi-step gradient, and batch reaction protocols)

Sample Compatibility & Compliance

The Kryoheater Selecta is not intended for direct sample immersion but serves as a primary thermal source for external process loops—making it compatible with jacketed reactors, calorimeters, environmental chambers, and test benches requiring externally regulated fluid circulation. Its design adheres to key regulatory frameworks applicable to GMP-compliant manufacturing environments: mechanical construction follows ASME B31.3 process piping guidelines; electrical safety conforms to UL 61010-1 and EN 61010-1; and documentation supports traceability per ISO 9001:2015 quality management systems. While the unit itself does not carry FDA 21 CFR Part 11 certification, its optional data logging module (LAUDA LogControl Pro) provides audit-trail-capable temperature recording aligned with ALCOA+ principles for pharmaceutical process validation.

Software & Data Management

The integrated LAUDA ControlCenter software enables remote monitoring, parameter scripting, and event-based alarm handling via Ethernet (TCP/IP) or RS485 Modbus RTU interfaces. Users can define multi-segment temperature programs with ramp rates down to 0.01 °C/min and hold tolerances ±0.1 °C over full range. Optional LAUDA LogControl Pro adds secure user authentication, electronic signature support, and CSV/Excel export with time-stamped metadata—including ambient temperature, fluid level, compressor runtime, and error logs. All data files are timestamped with UTC synchronization and include checksum verification to ensure integrity during transfer and archival—critical for IQ/OQ/PQ documentation in regulated industries.

Applications

• Pharmaceutical process development: precise thermal control of crystallization, hydrogenation, and API synthesis in jacketed glass or stainless-steel reactors
• Automotive component testing: simulating extreme ambient conditions for battery thermal management systems, power electronics, and fluid dynamics validation
• Aerospace materials qualification: conditioning composite layups, adhesives, and sealants under controlled thermal cycling per ASTM D570 and MIL-STD-810G
• Chemical R&D: supporting exothermic/endothermic reaction calorimetry, polymerization kinetics studies, and catalyst screening under reproducible thermal boundary conditions
• Calibration laboratories: serving as a stable reference source for secondary thermometer calibration across extended ranges per ISO/IEC 17025

FAQ

What heat transfer fluids are compatible with the Kryoheater Selecta?

Standard options include LAUDA Therminol LT, Dow Corning 200 Fluid, and Shell Heat Transfer Oil S2 X. Fluid selection must consider viscosity at minimum operating temperature, flash point relative to maximum setpoint, and chemical compatibility with AISI 316L components.
Is nitrogen pressurization mandatory?

No—it is optional but recommended for processes requiring elevated boiling points or reduced vapor pressure at high temperatures. The system is rated for continuous operation up to 6 bar(g) with nitrogen; alternative inert gases may be used if verified for material compatibility.
Can the unit operate unattended for 72+ hours?

Yes—when installed with proper coolant supply, fluid level monitoring, and ambient temperature control (15–30 °C), the Kryoheater Selecta supports uninterrupted operation for >168 hours, as verified in LAUDA’s accelerated life testing protocol (Report No. KHS-LT-2023-087).
Does LAUDA provide IQ/OQ documentation packages?

Yes—factory-verified Installation Qualification (IQ) and Operational Qualification (OQ) templates are available upon order, including calibration certificates traceable to PTB (Physikalisch-Technische Bundesanstalt) standards.