JULABO LC Series High-Precision Temperature Controller

Overview

The JULABO LC Series High-Precision Temperature Controller is an engineered thermal management solution designed for demanding laboratory and industrial applications requiring stable, repeatable, and traceable temperature control of external heating or cooling devices. Unlike integrated circulators, the LC Series functions as a standalone intelligent controller—receiving feedback from external Pt100 sensors and modulating power to resistive heaters, heating tapes, cooling coils, or electrically heated mantles via solid-state relay outputs. Its core architecture employs adaptive PID (Proportional-Integral-Derivative) control algorithms, continuously optimized in real time to minimize overshoot, reduce settling time, and maintain setpoint stability across dynamic thermal loads. The system supports dual-sensor operation: one primary working sensor for control loop feedback and a physically independent safety sensor for redundant overtemperature protection—critical for unattended operation and GLP-compliant workflows.

Key Features

• Triple Pt100 input capability: Dedicated terminals for working sensor, safety sensor, and optional reference sensor—enabling simultaneous monitoring, cross-validation, and fail-safe shutdown.
• High-resolution digital display: LC4 features dual LED displays (setpoint and actual temperature); LC6 integrates both LCD and LED for enhanced readability and simultaneous multi-parameter visualization (e.g., setpoint, process value, safety limit, output %).
• Configurable analog output (0–10 V or 4–20 mA): Enables seamless integration with chart recorders, PLCs, SCADA systems, or centralized DCS platforms for long-term trend logging and remote supervision.
• RS-232 serial interface: Supports bidirectional communication for remote parameter configuration, real-time data streaming, and automated calibration verification using JULABO’s PC-based software suite.
• Programmable high/low temperature alarms: User-defined thresholds trigger visual alerts, audible signals, and automatic heater cutoff—fully compliant with ISO/IEC 17025 clause 5.4.2 for equipment condition monitoring.
• Rugged aluminum housing with IP20-rated enclosure: Designed for benchtop or panel-mount installation in controlled environments; meets EMC immunity standards per EN 61326-1 for laboratory instrumentation.

Sample Compatibility & Compliance

The LC Series is not a direct-contact thermal device but a precision controller for externally mounted thermal actuators. It is routinely deployed with glass-jacketed reactors equipped with heating mantles, rotary evaporator baths, catalytic test rigs with embedded cartridge heaters, and custom-built calorimetry cells using Peltier or glycol-cooled jackets. All models comply with IEC 61010-1 (Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use) and electromagnetic compatibility standards EN 61326-1 and EN 61000-6-3. The dual-sensor architecture satisfies risk mitigation requirements outlined in FDA 21 CFR Part 11 Annex 11 for computerized system validation, supporting audit trails when paired with JULABO’s validated data acquisition software.

Software & Data Management

JULABO provides dedicated Windows-compatible configuration and monitoring software (LC-Com) that enables full remote access to all controller parameters—including PID tuning constants, alarm thresholds, sensor linearization tables, and calibration offsets. The software logs timestamped temperature data at user-selectable intervals (1 s to 60 min), exports CSV files compatible with MATLAB, Excel, or LIMS platforms, and generates PDF reports with digital signatures for QA documentation. When used in regulated environments, the software supports electronic signatures, role-based access control, and 21 CFR Part 11–compliant audit trails—including operator ID, parameter change history, and system event timestamps.

Applications

• Chemical synthesis: Precise ramp-hold profiles for exothermic reaction control in jacketed glass reactors.
• Materials testing: Thermal aging studies of polymers and composites under tightly bounded temperature cycles (ASTM D3045).
• Pharmaceutical QC: Stability chamber qualification and thermal mapping validation per ICH Q5C guidelines.
• Calorimetry support: Synchronization of heater power with differential scanning calorimeter (DSC) signal acquisition.
• Industrial pilot-scale processing: Closed-loop temperature regulation of inline heat exchangers and extruder barrel zones.

FAQ

Can the LC controller be used with non-JULABO heating devices?
Yes—the LC Series is vendor-agnostic and compatible with any resistive heating element or solid-state power controller accepting 0–10 V or 4–20 mA analog input, provided appropriate electrical isolation and grounding are implemented.
Does the LC6 support Ethernet or USB connectivity?
No—only RS-232 serial communication is natively supported; however, third-party USB-to-RS232 adapters certified to FTDI or Silicon Labs chipsets are widely used in validated installations.
How is sensor calibration traceability maintained?
Each LC unit ships with a factory calibration certificate referencing NIST-traceable Pt100 standards; users may perform field verification using certified reference thermometers per ISO/IEC 17025 section 6.5.2.
Is the safety cutoff function independently powered?
The safety circuit operates on the same main supply but uses galvanically isolated signal paths and a separate comparator stage—ensuring failure of the primary control loop does not compromise safety sensor functionality.
What is the maximum recommended load for the built-in relay output?
The internal SSR output is rated for ≤5 A resistive load at 240 VAC; for higher-power applications, JULABO recommends interfacing with external contactors or SCR power controllers via the analog output signal.