Traceable® 37803-92 Platinum RTD High-Precision Waterproof Thermometer

Overview

The Traceable® 37803-92 Platinum RTD High-Precision Waterproof Thermometer is a laboratory- and field-grade digital temperature measurement instrument engineered for metrological integrity in demanding thermal monitoring applications. It employs a platinum resistance thermometer (Pt100) sensing element conforming to IEC 60751 Class A tolerance specifications, delivering stable, repeatable resistance-to-temperature conversion across its full operational range of –100 °C to +300 °C. The device operates on the fundamental principle that the electrical resistance of high-purity platinum varies predictably with temperature—enabling traceable, linearized output with minimal drift over time. Its IP67-rated enclosure ensures reliable operation in wet, dusty, or washdown environments, including food processing lines, pharmaceutical cold-chain validation, sterilization cycle verification, and environmental chamber calibration. The instrument is supplied with a NIST-traceable Certificate of Calibration (Traceable®), documenting as-found and as-left data against primary standards maintained at an ISO/IEC 17025-accredited calibration laboratory—supporting compliance with FDA 21 CFR Part 11, ISO 17025, and GLP/GMP documentation requirements.

Key Features

• Platinum RTD probe (Pt100, Class A) with stainless-steel sheath (15 cm × 0.25 cm), optimized for rapid thermal response and mechanical durability in aggressive media
• IP67 ingress protection rating ensures full submersion resistance up to 1 m for 30 minutes and complete dust-tightness
• Dual-color (green/red) backlight display with configurable high/low alarm thresholds aligned to HACCP Critical Limits (e.g., 5–60 °C for food safety zones)
• Min/Max memory tracking with hold function for transient temperature capture during process qualification or validation studies
• RS232 serial interface enabling direct connection to PCs, PLCs, or standalone data loggers for automated temperature logging and audit trail generation
• Integrated battery-powered design (included AA cells) supports portable use without external power sources; low-battery indicator ensures uninterrupted measurement continuity

Sample Compatibility & Compliance

The 37803-92 is compatible with liquid, semi-solid, and gaseous media where direct contact measurement is required—including aqueous solutions, oils, steam-jacketed vessels, refrigerated transport units, and cleanroom HVAC ducts. Its stainless-steel probe meets FDA-compliant material requirements for food-grade and pharmaceutical applications. The device satisfies key regulatory expectations for temperature monitoring infrastructure: it supports HACCP Principle 4 (critical limit monitoring), aligns with USP Analytical Instrument Qualification guidelines, and provides documented traceability per ISO/IEC 17025 Clause 6.6. Calibration records include uncertainty budgets calculated per GUM (JCGM 100:2008). Optional accessories—such as the WRU23609-228 USB-to-RS232 adapter and Traceable Data Collection Software (Cat. No. 37804-13)—facilitate 21 CFR Part 11-compliant electronic recordkeeping, including user authentication, audit trails, and electronic signatures.

Software & Data Management

When interfaced via RS232, the thermometer streams real-time temperature data at user-selectable intervals (1–60 sec) to Traceable Data Collection Software (sold separately), which runs on Windows-based systems. The software enables time-stamped data export to CSV or Excel formats, customizable alarm notifications, trend graphing with statistical overlays (mean, SD, min/max), and automated report generation compliant with internal SOPs or external audit requirements. All data files retain embedded metadata—including instrument ID, operator ID, calibration due date, and environmental conditions—ensuring full ALCOA+ (Attributable, Legible, Contemporaneous, Original, Accurate, Complete, Consistent, Enduring, Available) data integrity. Firmware updates are delivered via secure download from the manufacturer’s technical support portal.

Applications

• Validation of autoclaves, ovens, incubators, and stability chambers per ISO 13485 and ICH Q5C
• Continuous monitoring of cold chain logistics (refrigerated trucks, warehouse zones, vaccine storage units)
• In-process temperature verification in dairy pasteurization, meat cooking, and ready-to-eat food production
• Calibration transfer between reference thermometers and field sensors in metrology labs
• Environmental testing of electronic components under thermal stress (JEDEC JESD22-A104)
• Research-grade cryogenic measurements down to –100 °C using dry-ice/ethanol baths or liquid nitrogen dewars

FAQ

Is the calibration certificate NIST-traceable and issued by an ISO/IEC 17025-accredited lab?
Yes—the included Traceable® Certificate documents calibration against standards maintained by an A2LA-accredited laboratory, with full uncertainty budget and measurement equations.
Can the thermometer be used in steam sterilization cycles exceeding 121 °C?
Yes—the probe and cable assembly are rated for continuous exposure up to 300 °C; however, prolonged exposure above 200 °C may accelerate long-term drift and warrants more frequent recalibration.
Does the device support user-defined calibration offsets?
No—this model uses factory-applied linearization coefficients based on ITS-90; offset adjustment is not supported to preserve traceability integrity.
What is the typical probe response time (t₉₀) in water at 25 °C?
Approximately 3.2 seconds, measured per ASTM E644 Annex A3 using standardized immersion depth and flow conditions.
Is the RS232 interface optically isolated?
No—it is electrically isolated via internal DC-DC conversion, providing noise immunity in industrial settings but not galvanic isolation.