Behr ET2 Temperature and Time Control Unit

Overview

The Behr ET2 Temperature and Time Control Unit is a precision-engineered thermal management system designed exclusively for integration with Behrotest® heating blocks in fat extraction and solvent reflux applications. It operates on the principle of closed-loop PID temperature regulation, utilizing a calibrated PT100 resistance thermometer (3-wire configuration) to deliver stable, repeatable thermal profiles across a wide operational range—from ambient-assisted preheating at 20 °C up to high-temperature digestion at 450 °C. Its 2200 W resistive power output supports rapid thermal response and sustained energy delivery to large-volume heating blocks used in Soxhlet and Randall-type fat analyzers. The unit complies with IEC 61010-1 safety standards for laboratory electrical equipment and is constructed with industrial-grade components to withstand continuous operation in regulated analytical environments.

Key Features

• Microprocessor-based PID controller with anti-drift compensation algorithm ensures long-term thermal stability without manual recalibration.
• Digitally programmable temperature setpoint (20–450 °C) and timer (1–999 min or continuous mode), both adjustable via intuitive numeric keypad interface.
• Dedicated 4-pole threaded power connector (IEC 60309-compatible) enables secure, low-resistance coupling to Behrotest® heating modules—minimizing voltage drop and contact heating under full load.
• Integrated 3-wire PT100 sensor input with cold-junction compensation delivers measurement repeatability within ±1 K across the full range.
• Robust metal chassis with foldable support stand (14.0 × 13.5 × 2.0 cm footprint) optimizes benchtop ergonomics and cable management; total unit weight: 17 kg.
• Front-panel status indicators provide real-time feedback on heating phase, timer countdown, and fault conditions (e.g., sensor open-circuit or overtemperature).

Sample Compatibility & Compliance

The ET2 is engineered for use with standardized fat extraction workflows compliant with AOAC 991.36, ISO 1444, and USDA Handbook 44 methodologies. It interfaces exclusively with Behrotest® heating blocks—ensuring mechanical, electrical, and thermal interoperability required for reproducible Soxhlet cycle timing and solvent reflux control. All internal circuitry meets EN 61326-1 (EMC) and EN 61010-1 (safety) requirements. For GLP/GMP laboratories, the unit supports audit-ready operation: time-stamped parameter changes are traceable via manual log entry, and its deterministic control architecture eliminates stochastic drift—critical for method validation per FDA 21 CFR Part 11 Annex 11 principles.

Software & Data Management

The ET2 operates as a standalone hardware controller without embedded firmware-based data logging or network connectivity. Parameter settings (temperature setpoint, duration, mode) are retained in non-volatile memory after power cycling. While it does not generate digital audit trails natively, its deterministic behavior—combined with external lab notebook documentation or integrated LIMS timestamping—meets baseline data integrity requirements for ISO/IEC 17025-accredited testing facilities. Users may record operational logs manually or via synchronized external timers and thermal imaging verification tools to satisfy traceability clauses in USP Analytical Instrument Qualification protocols.

Applications

• Fat determination in food, feed, and agricultural commodities using hot solvent extraction (e.g., petroleum ether, diethyl ether) per AOAC Official Methods.
• Acid hydrolysis and lipid saponification steps requiring precise ramp-and-hold thermal profiles in nutritional analysis labs.
• Controlled thermal pretreatment of solid samples prior to gravimetric or NIR-based fat quantification.
• Method development for accelerated solvent extraction (ASE) validation where thermal consistency directly impacts recovery accuracy.
• Calibration verification of reference heating blocks in metrology labs supporting inter-laboratory proficiency testing programs.

FAQ

Is the ET2 compatible with non-Behrotest® heating blocks?
No—the unit’s 4-pole threaded power interface and thermal feedback loop are mechanically and electrically optimized for Behrotest® series blocks only. Interfacing with third-party heaters may result in unstable control or safety hazards.
Does the ET2 support remote monitoring or RS-232/USB communication?
No—it is a dedicated local-control device with no digital communication ports. All adjustments and status monitoring occur via front-panel controls and LED indicators.
What maintenance is required for long-term accuracy?
Annual verification of PT100 sensor calibration against NIST-traceable reference standards is recommended; visual inspection of the 4-pole connector for oxidation or thread wear should be performed before each high-power cycle.
Can the ET2 be used in explosion-proof environments?
No—it lacks ATEX or IECEx certification and is intended solely for general laboratory use under standard ventilation conditions.
How does the anti-drift system function during extended heating cycles?
The controller continuously compares real-time sensor feedback against a dynamically adjusted thermal model, compensating for thermal inertia and ambient drift through adaptive integral gain tuning—without user intervention.