Quick answer: To log a sterilization cycle with the testo 190-T1, define an approved qualification protocol, configure the logger using the testo 190 CFR system and multifunction case, position its short rigid temperature probe at a validated location, run the cycle and read out the complete temperature record afterward. Temperature alone does not certify sterility or establish that a cycle passes.
Why the testo 190-T1 is different from a shipment logger
The testo 190-T1 (0572 1901) is a compact CFR-capable process temperature logger with a 25-mm-long, 3-mm-diameter rigid probe. Testo specifies a 60,000-reading memory, measuring interval from 1 second to 24 hours, IP68 construction and operation within the published temperature conditions. Its short probe is intended for restricted spaces in sterilizers, containers and validation fixtures. For related guidance, see Testo 160-T: Configure Wi-Fi Temperature Logging and Alerts.
Programming/readout uses the testo 190 multifunction case, which supports multiple loggers, and the separately licensed testo 190 CFR software. Do not instruct a reader to connect the logger to a standard USB cable or use shipping-logger PDF configuration workflows.
Set up a defensible qualification run
- Start with the approved protocol. Define cycle type, required monitored locations, calibrated sensors, duration and acceptance rules appropriate to the specific process.
- Inspect and identify the logger. Record serial number, calibration status, battery/seal integrity and probe condition. Confirm the measurement temperature does not exceed the model’s specification.
- Program with the case and CFR software. Configure interval, clock and start behavior, then verify each logger’s channel and assignment. If several instruments are used, label the locations uniquely.
- Place the probe appropriately. Use approved fixtures and loading patterns. Avoid a placement where the metal housing or rigid shaft changes the monitored condition or becomes a hazard.
- Run the controlled process. Follow the validated sterilizer procedure without altering it simply to suit the logger.
- Retrieve and inspect records. Use the multifunction case and CFR software for readout; review complete time-temperature curves, clock alignment, gaps and unexpected peaks.
- Retain audit evidence. Preserve original files, configuration, logger identity, calibration status, deviations and approved report/signature workflows.
How much recording capacity is needed?
Hypothetical capacity example: an 80-minute study programmed at a 2-second interval schedules approximately 80 × 60 ÷ 2 = 2,400 readings for one logger. That fits within a nominal 60,000-reading memory, assuming the configured event count and any existing data are accounted for. Memory capacity does not establish that a 2-second interval or an 80-minute cycle is valid for a sterilization process. For broader guidance on choosing a logging interval, see our sampling intervals guide.
Interpret the curve without claiming sterilization success
| Observation | What it can indicate | Additional evidence required |
|---|---|---|
| Slow heat-up at one location | Possible cold spot or probe placement effect | Approved mapping design and repeat cycle |
| Insufficient time in specified band | Potential process deviation | Validated cycle requirements and quality disposition |
| Unexpected gap | Logger or readout issue | Data-integrity investigation |
| All logger temperatures appear acceptable | Supports physical monitoring | Other required mechanical, chemical and biological evidence |
Compliance and safety limits
Testo describes its CFR software as designed for 21 CFR Part 11-relevant electronic records. Using it does not by itself make an entire process compliant. Validation also requires an appropriate quality system, access controls, procedural qualification and data review. The CDC recommends mechanical, chemical and biological monitoring in healthcare sterilization; a temperature logger cannot demonstrate microbial kill on its own. Autoclaves contain pressurized steam and hot components—only trained specialists should install instrumentation and handle completed cycles.
References
testo 190-T1 official page, case and CFR software documentation; CDC recommendations for sterilization monitoring.