Temperature and humidity data logger: Continuous monitoring for GxP environments

EU GDP Chapter 3, WHO TRS 961 Annex 9, and USP <1079> all point to the same underlying requirement: documented, continuous environmental monitoring with calibrated devices and traceable records. That rules out generic consumer-grade loggers and most USB-download solutions.

Eupry's P1TH sensor covers +2°C to +50°C / 35.6°F to 122°F with +/-0.1°C accuracy and 20-80% RH with +/-1.5% RH accuracy. Long-term drift is +/-0.03°C per year for temperature and less than 0.25% RH per year for humidity. The P2TH probe extends the range to +100°C / 212°F for applications requiring a flexible external probe - a 2.5m cable, 16mm maximum diameter, and a 60-second response time make it practical for tight enclosures and stability chambers.

Both sensors connect to the DW2 WiFi data logger, which carries CE, RoHS, and FCC certifications, uses end-to-end AES128 encryption, and stores 30+ days of data locally during WiFi outages with automatic sync on reconnection. Every unit has a unique GS1 GRAI Code - a detail that matters at audit time.

Manual monitoring creates friction that compounds over time. A single site with 10 loggers running USB downloads means 10 physical retrieval trips, 10 data exports, and 10 files to reconcile - every cycle. Multiply that across multiple locations, and a QA team can spend hours each week on data handling that adds zero analytical value.

The consequences are concrete. Missed download windows create data gaps. Data gaps create deviations. Deviations require investigations. Investigations delay batch release. Each link in that chain carries a time cost and a financial one.

WiFi-based continuous logging removes the retrieval step entirely. The DW2 logger transmits at configurable intervals from 30 seconds to 15 minutes, with real-time SMS and email alerts when thresholds are breached. Your team stops chasing data and starts acting on it.

The Eupry Team listens and provides a rapid response. That, added to their top-notch technology, provides accurate mapping and monitoring within industry rules and regulations.

Yolanda Rodriguez, Executive Operations Administrator at FedEx

The difference between these two approaches is structural. Here is how they compare across the dimensions that matter most to quality teams.

The temperature and humidity data logger software behind Eupry's platform also integrates with LIMS and QMS systems via REST API, so data flows into your existing quality infrastructure without manual re-entry.

Getting from zero to a GxP-compliant continuous monitoring setup follows a predictable path. These four steps determine whether the deployment holds up under scrutiny.

1. Risk assessment first. Identify your risk zones - hot and cold spots, door areas, control probe locations. The risk assessment determines sensor count and placement. Skipping this step and placing sensors arbitrarily is the most common setup failure.
2. Sensor placement and hardware setup. Mount P1TH or P2TH sensors at risk zone locations. The DW2 logger connects via 2.4GHz WiFi or 4G/3G where WiFi coverage is limited. Sensors are shelf-placed, taped, or screw-mounted depending on the environment.
3. Software configuration and alarm thresholds. Configure measurement intervals, set alarm thresholds appropriate to your product ranges, and assign notification recipients. For temperature and humidity data logger software with FDA 21 CFR Part 11 requirements, activate the Enterprise tier with digital signatures and immutable audit logs.
4. IQ/OQ documentation. Generate installation qualification and operational qualification records through the platform. Calibration certificates with measurement uncertainty are included. Your compliance documentation is ready before the first alert fires.

The market for temperature and humidity data loggers ranges from sub-$20 USB sticks to enterprise-grade GxP systems. For regulated environments, the selection criteria go well beyond price per unit.

Thirteen factors determine whether a data logger is fit for GxP use: installation complexity, accuracy, response time, sensor type, materials, logging frequency, memory capacity, temperature range, calibration documentation, battery life, compliance certifications, software capability, and support quality. A logger that scores well on 10 of those 13 can still fail an audit on the remaining 3.

For humidity specifically, the P3TH Rotronic humidity probe offers 0-100% RH coverage at +/-0.8% accuracy for applications requiring the full humidity range. The HC2A high-precision humidity probe reaches +/-0.5% RH accuracy with less than 1% drift per year - relevant for stability studies where measurement uncertainty must be documented over extended periods.

Battery life is a practical consideration that is straightforward to underestimate. The DW2 runs 2 years on standard AA batteries, with low-battery alerts before any data gap occurs. That removes one more manual tracking task from the quality team's schedule.