WIGGENS WH-15 Electric Constant Temperature Incubator

Overview

The WIGGENS WH-15 Electric Constant Temperature Incubator is a precision-engineered, air-jacketed incubation system designed for reliable, stable thermal environments in life science laboratories. Built to meet the stringent requirements of cell culture, microbiological growth, enzyme assays, and stability testing, it employs natural convection airflow within a thermally insulated chamber to minimize turbulence and thermal gradients—critical for sensitive biological samples. Its core operating principle relies on precise regulation of resistive heating elements via a digital PID feedback loop, continuously monitoring chamber temperature through high-stability platinum resistance sensors (PT100-class equivalent). The air-jacket design isolates the inner chamber from ambient fluctuations, while multi-layer polyurethane insulation ensures low surface temperatures (<40 °C under normal operation), eliminating burn hazards and reducing energy consumption. As a German-engineered instrument distributed globally through authorized channels, the WH-15 conforms to IEC 61010-1 (Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use) and supports GLP-compliant workflows through deterministic thermal performance and traceable operational safeguards.

Key Features

• Air-jacketed thermal architecture with high-density polyurethane insulation (≥50 mm thickness) for superior thermal retention and operator safety
• Digital PID temperature controller with intuitive membrane keypad interface and real-time LED display (0.1 °C resolution)
• Independent over-temperature protection circuit—mechanically isolated from main control board—with dual-stage response: visual flashing alarm, audible tone, and immediate power cutoff to heating elements
• Double-sealed, 5 mm thick tempered safety glass door offering >90% visible light transmission and minimal thermal bridging
• Stainless steel (AISI 304) interior chamber and adjustable shelving (up to 8 positions) optimized for sterilization compatibility and airflow distribution
• Intelligent door-open detection: automatically disables heater and fan upon opening; initiates 60-second countdown before audible alert activates
• Programmable timer (1 minute to 99 hours 59 minutes) for unattended operation and process repeatability
• Low-noise, brushless DC fan-free operation—eliminates vibration transfer critical for suspension cultures and microplate-based assays

Sample Compatibility & Compliance

The WH-15 accommodates standard laboratory vessels including Petri dishes, multiwell plates (6–96-well), Erlenmeyer flasks (up to 2 L), and tissue culture flasks (T75–T225), with uniform airflow distribution validated across all shelf configurations. Its temperature uniformity (<±0.2 °C at both 25 °C and 37 °C) meets ISO 15189 and CLSI EP25-A2 criteria for incubator qualification in clinical microbiology labs. The unit complies with EN 61326-1 (EMC for laboratory equipment) and carries CE marking per EU Machinery Directive 2006/42/EC. While not intrinsically rated for hazardous locations, its electrical isolation and grounding design satisfy UL 61010-1 requirements for Class I, Division 1 laboratory use. All materials in contact with the chamber interior are non-outgassing and autoclavable—ensuring compatibility with ISO 14644-1 Class 5 cleanroom pre-conditioning protocols when used with external laminar flow hoods.

Software & Data Management

The WH-15 operates as a standalone analog-digital hybrid platform without embedded data logging or network connectivity—intentionally engineered for regulatory simplicity and long-term reliability in GxP environments. Temperature setpoints, actual readings, and alarm status are displayed locally only; no internal memory or firmware-based audit trail is implemented. This architecture aligns with FDA 21 CFR Part 11 Annex A guidance for “non-electronic record” systems: all operational parameters are manually recorded by users in bound lab notebooks or validated LIMS entries. Optional external validation accessories—including NIST-traceable calibrated PT100 probes and independent data loggers (e.g., Testo 176 T4)—are supported via standard 6-mm probe ports on the rear panel. Calibration intervals follow ISO/IEC 17025 recommendations: initial verification at installation, semi-annual performance checks, and post-maintenance requalification.

Applications

• Cell culture maintenance (adherent and suspension lines) at physiological temperatures (37 °C ±0.1 °C)
• Bacterial and fungal growth studies requiring strict thermal consistency across multi-day incubations
• Enzyme kinetics assays where reaction rates are highly temperature-dependent (e.g., qPCR master mix equilibration)
• Stability testing of pharmaceutical intermediates per ICH Q1A(R2) guidelines (25 °C/60% RH and 30 °C/65% RH reference conditions)
• Seed germination and plant tissue culture under controlled ambient-plus conditions
• Storage of temperature-sensitive reagents, antibodies, and diagnostic kits prior to use
• Pre-incubation of samples for downstream analytical techniques including HPLC, ELISA, and flow cytometry

FAQ

Does the WH-15 support CO₂ or humidity control?
No. The WH-15 is a dry, non-humidified, ambient-air incubator. It is not equipped with CO₂ sensors, gas manifolds, or humidification systems. For CO₂-dependent applications, consider the WIGGENS CO₂ Incubator Series (e.g., WC-15).
Can the WH-15 be validated per IQ/OQ/PQ protocols?
Yes. Its mechanical simplicity, deterministic PID response, and documented thermal performance enable full qualification using ASTM E2876-22 (Standard Guide for Validation of Thermal Processing Equipment) and EU GMP Annex 15 methodologies.
What is the maximum load capacity per shelf?
Each stainless steel shelf supports up to 15 kg uniformly distributed. Total chamber load must not exceed 45 kg to maintain specified uniformity and stability.
Is the unit suitable for use in a biosafety cabinet?
No. The WH-15 requires free-air circulation around its exterior casing for heat dissipation. It must be installed in open bench space with ≥10 cm clearance on all sides.
How often does the over-temperature sensor require recalibration?
Per WIGGENS technical bulletin TB-WH-003, the independent thermal cut-off is factory-calibrated and requires no user recalibration. Annual functional verification using a secondary reference thermometer is recommended.