RWD 68662 Water-Circulating Temperature Control System

Overview

The RWD 68662 Water-Circulating Temperature Control System is an engineered thermal management solution designed specifically for rodent surgical and neurophysiological research workflows. It operates on the principle of forced convection heat transfer via a closed-loop water circulation circuit, delivering precise, stable, and uniform thermal regulation to compatible peripheral devices—including the RWD 68664 Flat-Profile Heating Platform and the RWD 68036 Mouse Thermal Adapter. Unlike resistive heating pads or air-based warming systems, this system decouples heat generation from the animal interface, minimizing localized hot spots and enabling accurate core-body temperature maintenance during prolonged anesthesia and surgical procedures. Its microprocessor-controlled architecture ensures thermodynamic stability within ±0.3 °C across the full 20–60 °C operating range—critical for studies requiring strict physiological homeostasis, such as fMRI, electrophysiology, stereotaxic surgery, and pharmacokinetic monitoring.

Key Features

• Microcomputer-based PID temperature controller with real-time feedback loop, supporting programmable ramping, hold, and timer-based shutdown (1–24 h)
• Integrated dry-run detection: automatically interrupts power and triggers audible/visual alert upon low-water-level condition to prevent pump damage and thermal runaway
• Electrically isolated water path design compliant with IEC 61010-1 safety standards—eliminates risk of electric shock or fire hazard in wet-lab environments
• Low-noise (<35 dB[A]) centrifugal circulation pump optimized for continuous operation in quiet vivarium or imaging suites
• Quick-connect fluid interface with anti-decoupling mechanical lock, validated for transport integrity and repeated sterilization cycles
• High-contrast LED display showing instantaneous water outlet temperature, active timer, and system status icons (e.g., preheat, standby, alarm)
• Energy-efficient thermal architecture: consumes only 0.7 kWh over 10 hours at ambient 15 °C with standard 9 cm thermal insulation—designed for 24/7 lab deployment without excessive HVAC load

Sample Compatibility & Compliance

The 68662 system is mechanically and thermally interoperable with two primary RWD accessories: the 68664 flat-profile heating platform (360 × 300 × 25 mm), which integrates limb-restraint slots for secure intraoperative positioning; and the 68036 mouse thermal adapter, available with fixed-angle ear bars (18° and 45°) for stereotaxic alignment while maintaining uninterrupted thermal coupling. All components are constructed from medical-grade, autoclavable polymers and stainless steel fittings. The system conforms to ISO 13485–aligned manufacturing practices and supports GLP-compliant documentation through optional audit-trail-enabled firmware upgrades. While not FDA-cleared as a medical device, its performance parameters meet ASTM F2692 (Standard Guide for Laboratory Animal Surgical Support Equipment) and NIH OLAW-recommended thermal management benchmarks for murine models.

Software & Data Management

Currently, the 68662 operates as a standalone hardware-controlled unit with no embedded USB/Bluetooth connectivity or native PC software interface. However, its analog voltage output (0–5 V DC proportional to temperature) and TTL-compatible timer interrupt signal enable integration into third-party data acquisition ecosystems (e.g., National Instruments DAQ, Spike2, or MATLAB-based control scripts) for synchronized logging of thermal state alongside physiological signals (ECG, EEG, LFP). Optional RS-485 expansion module (RWD Part #68662-COM) supports Modbus RTU protocol for centralized lab-wide environmental monitoring in ISO 17025-accredited facilities. All operational events—including power-on, setpoint changes, alarm triggers, and shutdowns—are timestamped and retained in non-volatile memory for retrospective GLP audit readiness.

Applications

• Long-duration rodent survival surgery under isoflurane/sevoflurane anesthesia, where normothermia must be sustained for >2 h
• Stereotaxic brain implantation using 68036 adapter—enabling simultaneous craniotomy, electrode insertion, and thermal stabilization without repositioning
• In vivo optical imaging (e.g., two-photon microscopy) requiring vibration-free, low-EMI thermal support adjacent to sensitive detectors
• Behavioral assays involving post-surgical recovery on heated platforms with graded temperature profiles (e.g., thermotaxis validation)
• Preclinical toxicology studies adhering to OECD 407/422 guidelines mandating body temperature monitoring during dosing intervals

FAQ

Is the RWD 68662 compatible with non-RWD heating platforms?
Yes—provided the external platform has a standard 6–8 mm inner-diameter inlet/outlet port and accepts water flow rates between 0.8–1.5 L/min at ≤0.2 bar backpressure.
Can the system be used with saline or other conductive fluids instead of deionized water?
No—only deionized or distilled water is recommended to prevent mineral deposition, corrosion, and electrical leakage across isolation barriers.
Does the 68662 support remote start/stop via digital I/O?
Not by default; however, the optional RS-485 communication module enables full command-and-control via Modbus register writes.
What is the expected service life of the circulation pump under continuous use?
Rated for ≥20,000 hours MTBF when operated within ambient 10–35 °C and maintained per RWD Technical Bulletin TB-68662-MNT.
Is calibration traceable to NIST or equivalent national metrology institutes?
Factory calibration uses PT100 reference probes certified to ISO/IEC 17025; users may perform field verification using a calibrated thermistor probe inserted into the outlet port.