Digi-Sense® 92000-05 12-Channel Scanning Thermometer

Overview

The Digi-Sense® 92000-05 is a precision-engineered 12-channel scanning thermometer designed for simultaneous, high-fidelity temperature monitoring across industrial process control, pharmaceutical manufacturing, materials testing, and academic research environments. Unlike single-point thermometers, this instrument employs time-multiplexed thermocouple signal acquisition—sampling each of its 12 independently isolated input channels at user-defined intervals ranging from 4 seconds to 60 minutes. Its measurement architecture adheres to established thermoelectric principles defined in ASTM E230/E230M and IEC 60584, supporting eight standard thermocouple types (J, K, T, E, N, R, S, B) with automatic cold-junction compensation (CJC) performed via internal reference sensors. The device operates on a robust microcontroller platform with non-volatile memory, ensuring full retention of calibration settings, alarm thresholds, and logged data during power interruption—a critical requirement for FDA 21 CFR Part 11–aligned workflows.

Key Features

• Twelve fully isolated thermocouple inputs with independent configuration per channel—including thermocouple type selection, alarm setpoints, resolution mode (0.1 °C or 1 °C), and unit preference (°C, °F, K, or °R).
• Configurable scan interval from 4 seconds to 60 minutes—enabling both rapid transient capture and long-term stability trending.
• Onboard storage capacity of 4680 timestamped measurements (date, time, channel ID, value), retained indefinitely without battery backup due to EEPROM-based memory architecture.
• Dual-mode display: real-time channel-by-channel readout or scrolling summary view; 12-digit LCD with 19 mm character height ensures legibility under laboratory or plant-floor lighting conditions.
• Front-panel MENU-driven interface allows intuitive setup of data logging intervals, printer output formatting, clock synchronization, and two-point per-channel calibration—each correction coefficient stored permanently with traceable metadata.
• Bidirectional RS-232 interface (RJ11 connector, ASCII protocol, 19.2 kbaud) supports remote configuration, real-time streaming, and batch download of stored datasets to Windows-based PCs using included software.
• Expandable architecture: up to eight units may be daisy-chained via RS-232 to form a synchronized 96-channel monitoring system, with centralized data aggregation and time-aligned export capabilities.

Sample Compatibility & Compliance

The 92000-05 accepts bare-wire or mini-connector thermocouples (ANSI-standard mini-TC interface), accommodating probe types including immersion, surface, gas, and penetration variants (e.g., Cole-Parmer catalog numbers 08516-55 through 08516-75). Input isolation exceeds 1500 V RMS between channels and chassis ground, minimizing cross-talk in electrically noisy environments such as HVAC systems, kiln controls, or reactor vessels. The instrument meets CE marking requirements for electromagnetic compatibility (EN 61326-1) and safety (EN 61010-1), and its firmware architecture supports ALCOA+ data integrity principles—ensuring attributable, legible, contemporaneous, original, accurate, complete, consistent, enduring, and available records per GAMP 5 and EU Annex 11 guidance. Optional CSV export enables direct import into LIMS or statistical process control (SPC) platforms.

Software & Data Management

The bundled Windows application provides full instrument control, live graphing (multi-channel overlay), and structured data export. Logged datasets include ISO 8601-formatted timestamps, channel identifiers, thermocouple type codes, and raw millivolt equivalents alongside compensated temperature values. All operations—including calibration edits, alarm threshold changes, and memory clears—are recorded in an immutable audit trail with operator ID and timestamp. Data files are saved in UTF-8 encoded CSV format with header rows compliant with ASTM E1461 and ISO/IEC 17025 reporting conventions. For regulated environments, the software supports digital signature integration and configurable export encryption (AES-256) upon request.

Applications

• Pharmaceutical lyophilization cycle validation—monitoring shelf temperature uniformity across multiple vial positions.
• Thermal mapping of autoclaves, ovens, and stability chambers per USP and ISO 13485 requirements.
• Metallurgical heat-treatment profiling, including austenitizing, quenching, and tempering stages.
• Chemical reaction calorimetry where exothermic onset must be captured across multiple reactor zones.
• Food safety HACCP monitoring—verifying critical control points during cooking, chilling, and holding processes.
• Academic materials science labs conducting phase-transition analysis (e.g., glass transition, crystallization onset) under controlled ramp profiles.

FAQ

What thermocouple types does the 92000-05 support?
It natively supports J, K, T, E, N, R, S, and B thermocouples with automatic type recognition when configured via the front panel or software.
Can the instrument operate without a PC connection?
Yes—the 92000-05 functions autonomously with full local display, onboard logging, and alarm triggering independent of any external computer.
Is calibration traceable to NIST standards?
While the unit itself is not supplied with a NIST-traceable certificate, its two-point per-channel calibration routine accepts reference values from NIST-traceable sources, and all calibration parameters are stored with date/time stamps for internal audit purposes.
Does it meet FDA 21 CFR Part 11 requirements?
The hardware and firmware support core Part 11 elements—including electronic signatures, audit trails, and secure data export—but full compliance requires site-specific validation documentation and procedural controls implemented by the end user.
How is power redundancy managed?
The unit accepts multiple input configurations (230 V AC, 10–24 V DC, or 7–20 V AC), enabling seamless fallback to uninterruptible power supplies or field-deployable battery packs in mobile applications.