testo Saveris 2-T2 WiFi Temperature Data Logger with Dual NTC Probe Inputs and Door Contact Interface

Overview

The testo Saveris 2-T2 is a CE-marked, TÜV-certified wireless temperature data logger engineered for continuous, unattended monitoring in regulated environments where traceability, audit readiness, and environmental integrity are critical—such as pharmaceutical cold chains, food storage facilities, vaccine refrigerators, cleanrooms, and laboratory incubators. It operates on the principle of high-stability NTC thermistor sensing, delivering calibrated temperature measurements traceable to national standards per DIN EN 12830. Unlike standalone loggers, the Saveris 2-T2 functions as a node within a cloud-connected ecosystem: it autonomously samples temperature via two external NTC probe inputs (and optionally monitors door status via a dedicated dry-contact interface), encrypts data in transit using industry-standard WLAN security protocols (WPA2/WPA2 Enterprise), and transmits time-synchronized readings to the testo Cloud platform via MQTT—a lightweight, publish-subscribe protocol designed for reliable telemetry in low-bandwidth or intermittent network conditions. Its robust IP65-rated enclosure ensures resistance to dust ingress and water jets, enabling deployment in demanding industrial or semi-outdoor settings without housing.

Key Features

• Dual independent NTC probe inputs (−50 °C to +150 °C) with ±0.3 °C accuracy and 0.1 °C resolution—ideal for differential or multi-zone monitoring (e.g., ambient vs. product core)
• Dedicated door contact interface for tamper- and access-event logging—critical for GxP compliance in controlled storage areas
• Integrated OLED display showing real-time values, alarm status, battery level, and WLAN connectivity—enabling local verification without mobile devices
• Field-replaceable 4× AA battery power architecture with 24-month typical service life (at 25 °C, 15-min interval); Energizer L91 lithium batteries recommended below −10 °C
• MQTT-based secure communication supporting WPA2 Enterprise authentication—compatible with corporate IT policies requiring certificate-based or RADIUS-authenticated WLAN access
• SNTP time synchronization ensuring sub-second timestamp accuracy across distributed nodes—essential for correlating events across multiple loggers in FDA 21 CFR Part 11–aligned workflows

Sample Compatibility & Compliance

The Saveris 2-T2 is not a sample-analysis instrument but an environmental condition monitor intended for non-invasive, long-term recording of ambient or surface temperatures in static or low-airflow enclosures. Its NTC probes (sold separately) are compatible with standard 2- or 3-wire configurations and may be inserted into glycol-filled sleeves for thermal mass stabilization during stability testing (per ICH Q5C). The device complies with DIN EN 12830 for temperature monitoring equipment used in refrigerated transport and storage, and its firmware architecture supports GLP/GMP-aligned operational requirements—including immutable audit trails, user-access controls, and electronic signature-ready reporting. While the hardware itself does not carry FDA clearance, its data integrity features (encrypted transmission, server-side write-once storage, and configurable alarm escalation paths) align with Annex 11 and EU GMP Chapter 4 expectations for computerized systems in quality-critical applications.

Software & Data Management

Data management is centralized in the testo Cloud platform—a ISO/IEC 27001-certified infrastructure hosted in German data centers. Users configure devices, define alarm thresholds (upper/lower limits, delay timers, system-status alerts), and generate reports via web browser or native iOS/Android apps. The Basic plan (free) provides 3-month rolling storage, manual PDF/CSV export, and single-user access. The Advanced subscription enables 2-year retention, automated scheduled exports, API-based integration with MES/LIMS systems (RESTful endpoints with OAuth 2.0), up to 10 concurrent users per account, and SMS alerting (25 messages/year per logger, extendable via add-on packages). All cloud interactions maintain full audit trail metadata—including timestamped user actions, configuration changes, and alarm acknowledgments—supporting 21 CFR Part 11 compliance when paired with organizational procedural controls.

Applications

• Pharmaceutical cold chain validation: continuous mapping of refrigerator/freezer units storing biologics, mRNA vaccines, or reference standards
• Food safety HACCP monitoring: real-time tracking of chilled/frozen warehouse zones, blast chillers, and delivery vehicles
• Medical device storage: environmental qualification of Class II/III device inventory rooms per ISO 13485 requirements
• Research laboratory incubators and stability chambers: long-term trending of temperature uniformity and deviation frequency
• Federal and state-regulated cannabis cultivation facilities: compliant environmental logging for seed-to-sale traceability mandates

FAQ

Is the testo Saveris 2-T2 suitable for use in explosive atmospheres (ATEX)?

No. The device is not intrinsically safe and lacks ATEX or IECEx certification. It is intended for use in non-hazardous locations only.
Can I connect more than two temperature probes to the Saveris 2-T2?

No. The hardware supports exactly two NTC probe inputs and one door contact interface. For multi-probe deployments, additional Saveris 2-T2 units or the Saveris 2-T1 (single-probe variant) must be commissioned.
Does the device support Modbus or BACnet integration?

No. Communication is exclusively via MQTT to the testo Cloud. Local protocol gateways (e.g., MQTT-to-Modbus bridges) would be required for legacy building management system integration.
What happens if the WLAN connection is lost?

Measurements continue locally with full memory buffering (up to 10,000 values per channel). Once connectivity resumes, buffered data is transmitted in chronological order with original timestamps—no data loss occurs.
Is calibration certificate included with purchase?

A factory calibration report (traceable to DKD/DAkkS standards) is supplied with each unit. On-site or accredited recalibration services are available through authorized testo service centers.