Stuart SCT1 Temperature Controller

Overview

The Stuart SCT1 Temperature Controller is a compact, benchtop precision instrument engineered for accurate thermal regulation of liquid-phase samples in academic, quality control, and routine laboratory environments. Designed specifically for integration with Stuart’s Undergrad-series heating plates and hotplate magnetic stirrers, the SCT1 operates on a closed-loop feedback principle: it continuously monitors sample temperature via a detachable stainless steel probe and dynamically modulates heater output to maintain setpoint stability within ±0.5 °C. Unlike open-loop heaters, this active control architecture ensures consistent thermal conditions during extended experiments—critical for viscosity measurements, reaction kinetics studies, dissolution testing, or solvent-based extractions where thermal drift directly impacts reproducibility. The unit functions in two distinct operational modes: as a proportional-integral (PI) temperature controller (20–200 °C) when connected to compatible Stuart heating devices, or as a standalone high-range digital thermometer (up to 325 °C) for spot-checking bath, oil, or distillation temperatures. Its robust yet lightweight housing (0.3 kg net weight) and IP54-rated enclosure provide protection against dust ingress and incidental water splashes—suitable for general wet-lab use without requiring dedicated fume hood installation.

Key Features

• Precision temperature control with ±0.5 °C accuracy across 20–200 °C range, optimized for aqueous and oil-based media
• Large, high-contrast LED display for rapid parameter verification under varied lighting conditions
• Detachable stainless steel temperature sensor with integrated mounting clip—enables safe positioning in aggressive chemical environments while isolating electronics from corrosive vapors
• Built-in universal clamp mechanism for secure attachment to standard 16 mm or 22 mm vertical/horizontal support rods (e.g., retort stands)
• Dedicated sensor holder built into the main housing—keeps probe upright and contamination-free during storage or non-operational periods
• Compact footprint (90 × 75 × 123 mm) and low mass facilitate flexible placement on crowded benches or inside ventilated enclosures

Sample Compatibility & Compliance

The SCT1 is validated for use with common laboratory heat-transfer media including deionized water, silicone oil, glycerol, and ethylene glycol mixtures. Its stainless steel sensor meets ISO 8573-1 purity class requirements for non-reactive contact surfaces and exhibits resistance to mild acids, alkalis, and organic solvents. Optional PTFE-coated probes (sold separately) extend compatibility to highly corrosive reagents such as concentrated HCl, HF, or nitric acid solutions. While the SCT1 itself is not certified to GLP or GMP standards, its stable control performance supports adherence to ASTM E2877-22 (Standard Guide for Temperature Calibration of Liquid-in-Glass Thermometers) and ISO/IEC 17025 traceability frameworks when paired with NIST-traceable reference thermometers. No regulatory approvals (e.g., FDA 21 CFR Part 11) apply, as the device lacks data logging, electronic signature, or audit trail functionality.

Software & Data Management

The SCT1 is a stand-alone hardware controller with no embedded firmware, network interface, or software dependency. All operation is performed manually via front-panel controls; no drivers, configuration utilities, or cloud connectivity are required. Temperature readings are displayed in real time but are not stored, exported, or timestamped. For laboratories requiring electronic record retention, integration with third-party data acquisition systems (e.g., LabVIEW, MATLAB, or custom Python scripts) is possible using optional analog voltage output modules (not included). Stuart does not supply proprietary software, nor does the SCT1 support USB, RS-232, or Bluetooth communication protocols.

Applications

• Thermal stabilization of reaction vessels during undergraduate organic synthesis labs
• Controlled heating of calibration baths for viscometer or densitometer validation
• Temperature maintenance in dissolution apparatus (USP Apparatus I/II) water baths
• Monitoring and regulating oil bath temperatures in reflux or distillation setups
• Calibration support for secondary temperature sensors used in QC/QA workflows
• Field-deployable thermal reference in mobile analytical units where portability and battery independence are essential

FAQ

Can the SCT1 be used with non-Stuart heating devices?
Yes—provided the external heater accepts an analog 0–10 V or 4–20 mA control signal and is compatible with the SCT1’s relay output specifications. Stuart does not guarantee interoperability or safety with third-party equipment.
Is the stainless steel sensor autoclavable?
No—the sensor is not rated for steam sterilization. Repeated exposure to saturated steam may compromise seal integrity and long-term calibration stability.
Does the SCT1 meet ATEX or IECEx certification for hazardous areas?
No—it is not intrinsically safe and must not be operated in flammable vapor atmospheres or classified zones.
What is the recommended recalibration interval?
Stuart recommends annual verification against a NIST-traceable reference thermometer under typical usage conditions. Field adjustment is not user-accessible; calibration requires authorized service centers.
Can the LED display brightness be adjusted?
No—the display operates at fixed luminance and contrast optimized for daylight and fluorescent lab lighting.