Wireless temperature humidity sensor for GxP environments

The regulatory floor is higher than most people assume. EU GDP Chapter 3 requires continuous temperature and humidity monitoring with documented records and defined alarm thresholds for storage areas. WHO TRS 961 Annex 9 goes further, specifying that monitoring equipment must be calibrated, that data must be retained for inspection, and that the monitoring system must operate independently of any HVAC control system.

USP <1079> adds measurement uncertainty requirements: the logging device must carry a maximum uncertainty of +/-0.5°C at calibration points. That rules out low-cost consumer sensors immediately.

Two practical consequences follow from these requirements. First, your sensor must carry a current calibration certificate with documented measurement uncertainty. Second, your data must be stored with an immutable audit trail - not just exported to a spreadsheet after the fact. Electronic records fall under FDA 21 CFR Part 11 in US-regulated environments, which means digital signatures and audit logs are mandatory, not optional.

The P1TH sensor covers +2°C to +50°C / 36°F to 122°F with +/-0.1°C accuracy and humidity from 20-80% RH at +/-1.5% RH accuracy. Temperature drift is +/-0.03°C per year. For higher-precision humidity requirements, the P3TH Rotronic probe delivers +/-0.8% RH accuracy across the full 0-100% RH range. Both are GxP-tailored from the ground up - not repurposed consumer hardware.

The architecture matters as much as the sensor itself. Eupry's DW2 WiFi data logger pairs with P1TH or P2TH sensors to deliver a complete temperature and humidity sensor with data logger in a single validated unit. The DW2 transmits over 2.4GHz WiFi with 4G/3G fallback, stores up to 10,000 measurements locally, and retains 30+ days of data during WiFi outages - syncing automatically on reconnection. No data gaps, no manual downloads.

Remote temperature monitoring via cell phone is handled through the Eupry platform: real-time SMS and email alerts fire the moment a parameter drifts outside your configured threshold. You do not need to be on-site to know something is wrong. You know in seconds.

The compliance status dashboard tracks environmental alarms (temperature excursions, humidity excursions), technical alarms (low battery, connectivity loss), and unacknowledged alarms that lack documentation. Calibration deadlines are tracked automatically. One-click alarm resolution closes the loop without manual paperwork.

It saves a lot of time to just be able to click and say: Please make a graph for this sensor and this time period.

Thomas Schmidt, CTO at B Science Global

The DW2 uses end-to-end AES128 encryption, carries CE, RoHS, and FCC certifications, and runs on standard AA batteries with a 2-year life. Each unit has a unique GS1 GRAI code - traceability built in, not bolted on.

Choosing the right wireless temperature humidity sensor for a regulated environment comes down to five criteria that matter at audit time. Evaluate each before committing to a setup.

• Calibration and drift specification: The sensor must have a documented drift rate. The P1TH carries +/-0.03°C per year temperature drift and less than 0.25% RH per year humidity drift - low enough that annual calibration cycles hold without surprises.
• Connectivity resilience: A sensor that goes offline and loses data is a compliance liability. Local data storage with automatic sync on reconnection is non-negotiable for GxP use.
• Audit-ready data architecture: Your records need to be immutable, timestamped, and accessible during an inspection. Look for platforms with FDA 21 CFR Part 11 support, including digital signatures and locked audit logs.
• Range fit: The P1TH covers +2°C to +50°C / 36°F to 122°F. The P2TH probe extends to +100°C / 212°F with a 2.5m cable for hard-to-reach monitoring points. Cryogenic or ULT storage requires a different sensor family entirely.
• IQ/OQ documentation: Hardware is the straightforward part. Validated installation with GxP IQ/OQ protocol documentation is what closes an audit finding. Eupry provides this as part of the installation service.

A QA Manager at a mid-market biotech discovers during internal audit preparation that two of three sites are running different monitoring systems with no common reporting format. Calibration certificates exist - but they are stored in different folders, managed by different people, and not linked to the sensors in the monitoring platform. During a mock inspection, the auditor asks for the calibration history on sensor 12 at Site B. It takes 40 minutes to locate the certificate.

This is a documentation fragmentation problem, not a sensor problem. The underlying hardware may be perfectly accurate. But the audit trail is broken.

The fix is not buying better sensors. The fix is deploying a wireless temperature humidity sensor setup where calibration certificates, sensor data, alarm acknowledgments, and IQ/OQ documentation live in one place - drillable by organization, location, and sensor profile. When the auditor asks for sensor 12 at Site B, the answer is 3 clicks away.

Eupry's platform consolidates exactly this: environmental data, calibration deadlines, and compliance documentation under one login. Multi-site quality teams get a single source of digital truth instead of a shared drive archaeology project before every inspection.