TV2 Frequently Asked Questions

Yes. The TV2 features a built-in audible alarm and a dry-contact relay that can activate external devices such as buzzers, warning lights, bells, or auto dialers when an alarm is triggered. Each sensor can be configured with custom high and low alarm limits, along with delay settings to help prevent false alarms. When an alarm occurs, the display flashes and the internal speaker sounds until it is acknowledged. The TV2 can also send email when connected to a local LAN via WiFI or Ethernet. Its relay supports long cable runs and can work with multiple TV2 units, making it ideal for reliable remote monitoring and alert systems.

Yes. The TV2 stores extensive logged data that can be easily transferred to a computer using the included TView software. You can archive your data manually or schedule regular downloads to keep your records up to date. With TView, you can view the current status of your TV2 in real time, generate reports, and print charts of logged data for documentation and analysis. The software also supports automatic data downloads, continuously saving new readings and organizing them into monthly archive files for easy access.

You can download TV2 data to a computer using the included USB cable or through a wired Ethernet connection. The TView software allows you to connect to the TV2, transfer logged data, and save it for archiving, reporting, or printing. For network-connected devices, simply configure the TV2's IP address in the TView software to access and manage data. If remote access is required, the TV2 can also be connected over the internet by configuring your router's port forwarding settings, allowing you to monitor and access data from virtually anywhere.

The TV2 delivers highly accurate monitoring with minimal instrument error of less than 0.1%, making overall accuracy primarily dependent on the connected sensor. It supports a wide range of sensors, including thermistors, digital temperature sensors, humidity sensors, thermocouples, and differential pressure sensors. Standard thermistor and digital sensors provide an accuracy of up to ±0.3°C, while humidity sensors offer ±3% RH accuracy. Thermocouples and differential pressure sensors are also available for specialized applications, ensuring reliable and precise measurements across different monitoring environments. Optional NIST-traceable calibration certificates are available for selected sensors.

Yes. All TV2 sensors can be calibrated to ensure accurate and reliable measurements. Wired sensors store their calibration data directly on the sensor, allowing them to retain their settings even when connected to a different TV2 monitor. Wireless sensors can also be calibrated, but their calibration settings are stored in the TV2 monitor, so recalibration or reapplying the settings may be required when moving them to another unit. For certified accuracy, NIST-traceable calibration services are also available as an optional service.

Yes. The TV2 is designed to support 21 CFR Part 11 and is designed to keep your logged data secure and protected. All recorded data is stored in non-volatile memory, ensuring it remains safe even during power failures and cannot be modified by users. The TView software allows you to securely view, combine, and print data without altering the original records. All data is stored in an encrypted format to maintain integrity and regulatory compliance. While data can be exported to Excel for reporting and analysis, exported files are editable and no longer meet 21 CFR Part 11 compliance standards.

Yes. The ThermaViewer (TV2) can be accessed remotely using the TView software. Once TV2 data is saved to a shared computer or server, authorized users can securely access, view, and manage logged data from another computer over a local network or the internet. For real-time monitoring, TView displays current sensor readings along with a chart of the latest logged data. The software can be installed on multiple computers at no additional cost, making it easy for multiple users to monitor and review data remotely.

The TV2 is supported by a range of compliance documents, including CE Mark Declaration of Conformity, Australia/New Zealand C-Tick Declaration of Conformity, compliance certificates, and enclosure material documentation. Complete test reports and additional certification documents are also available upon request by contacting 2DI.

Yes. The TV2 allows you to export logged data to an Excel (.XLS) spreadsheet using the TView software. Data is initially stored in an encrypted .TXV format to maintain 21 CFR Part 11 compliance and protect it from unauthorized changes. Once exported to Excel, the data can be viewed, analyzed, and edited as needed. TView also lets you zoom in on specific data before exporting, making it easy to focus on the information you need. Please note that Excel supports a maximum of 65,536 rows per worksheet during export.

The TV2 can store over 80,000 temperature readings per sensor or up to 60,000 temperature and humidity data pairs, providing long-term monitoring and data logging. Depending on your logging interval, this can represent more than 1.5 years of recorded data. With the built-in zoom feature, you can view either the complete data history or focus on a specific time period directly on the TV2 display. This makes it easy to analyze both long-term trends and detailed readings without losing access to stored data.

The TV2 supports up to four sensor ports, allowing it to monitor four different locations simultaneously. Depending on the sensor type, each port can measure either a single parameter (such as temperature) or dual parameters (temperature and humidity), providing up to eight monitoring channels. The system supports a variety of sensor types, including thermistors, thermocouples, and temperature/humidity sensors. However, a single TV2 unit can be configured for either wired or wireless sensors, and both types cannot be used together on the same monitor.

The TV2 supports automatic data downloads through the TView software, allowing you to securely back up logged data to your computer without manual intervention. After connecting your TV2 via USB or a local network, you can schedule automatic backups and organize data into monthly archive files. TView continuously updates the current month's file while the software is running and automatically retrieves any missed data when restarted. This ensures your monitoring records remain complete, secure, and easy to access for reporting or long-term storage.

Yes. The TV2 includes password protection to prevent unauthorized users from changing system settings or operating parameters. While anyone can view logged data, zoom, scroll, and review readings, only authorized users with the correct password can access and modify the system configuration. The logged data itself remains fully protected and cannot be edited or altered, ensuring secure, reliable records for monitoring and compliance purposes.

USP <797> and <800> are regulatory standards for handling non-hazardous and hazardous drugs in healthcare environments. They require proper environmental monitoring to help ensure patient safety, staff protection, and regulatory compliance. The TV2 supports these requirements by monitoring temperature, humidity, and differential pressure. It helps maintain critical environmental conditions, including negative pressure monitoring for hazardous drug areas and continuous temperature tracking. This makes the TV2 an ideal solution for cleanrooms, pharmacies, laboratories, and other regulated healthcare facilities.

It is normal for two thermometers to display different temperatures inside the same refrigerator. Airflow, shelf position, stored items, and compressor operation can create small temperature variations throughout the compartment. When new or warmer items are placed inside, they temporarily affect the surrounding temperature until they cool down. For the most accurate monitoring, sensors should be positioned in the specific area where temperature control is most critical.

2DI uses digital temperature sensors because they provide excellent accuracy, stability, and reliable performance for most temperature monitoring applications. Compared to traditional analog sensors, digital sensors offer better linearity, require less external circuitry, and are more cost-effective. They also maintain their accuracy over longer periods, reducing the need for frequent recalibration. Unless your application involves extremely high or low temperatures, digital sensors are the recommended choice for dependable and efficient environmental monitoring.

A refrigerator maintains its temperature via its thermostat which continually turns on the compressor to draw down the temperature when ever the internal temperature rises above the set level. Once the internal temperature reaches the set temperature the compressor and fan turns off. This happens more or less frequently depending on how well the cold cavity is insulated and on how often the door is opened. When ever the door is opened the cold air inside the unit spills out into the exterior environment and is replaced by the room temperature external air. this causes the compressor fan to come on to cool down the air. Even if the door is never opened the interior air will eventually warm up enough to trigger the compressor and/or fan because the exterior heat will leak into the interior. Because the air is continually being either cooled down or left, to sit the refrigerated air (interior temperature) is constantly either warming up or cooling down. So the interior temperature of any refrigerator is never just at a constant temperature. It is constantly warming up and cooling down. This see sawing effect can easily be observed if you log the interior temperature of any refrigerator. There has been a lot of time invested in determining how to maintain a constant temperature. Very sophisticated cooling systems utilize a PID system in an effort to maintain a fixed temperature.

An NIST study in 2009 determined that dormitory type refrigerators are completely inadequate for vaccine storage. The study which used 19 data loggers to record temperature in these small refrigerators concluded that: “ From these results, it is clear that the dormitory-style refrigerator can not be relied on to maintain vaccine storage temperatures, regardless of the packing density or storage containers used. The dormitory-style refrigerator’s performance was consistently unacceptable, regardless of vaccine storage location within the refrigerator”.

The study recommended that data loggers be used to monitor the vaccine temperatures. The study used data loggers which recorded temperatures either every minute or every two minutes. NIST stopped short of recommending a specific logging interval or a particular type of data logger, but emphasized that data logging of temperature is crucial in determining the safe storage of vaccines in a refrigerator over time. Noting that recording the temperature twice a day was apt to miss temperature excursions which could occur within short periods of time.

Vaccine vials stored in the open air as opposed to plastic trays or some type of cardboard container, recorded a larger temperature change during periodic door openings but as long as the doors remained open for brief periods of time but recovered quickly once doors were closed.

Frequently Asked Questions

Does the TV2 have an audible internal alarm?

Can I print out a paper chart of my logged data?

How do I download data to a computer for archiving or printing?

How accurate are the various sensors that can be used with the TV2?

Can I calibrate the sensors?

Is the TV2 compliant with data security and 21 CFR Part 11?

Can the ThermaViewer be accessed remotely?

Documents of compliance and Declarations of Conformity?

Can I see my logged data in an Excel spreadsheet?

How much data can I see on the TV2 screen at one time?

How many channels does the TV2 have?

How does automatic data downloading work on the TV2?

Can I password protect the stored data?

What are USP <797> and <800> requirements?

Why do two thermometers show different temperatures in the same refrigerator?

Why does 2DI use digital temperature sensors?

How does a refrigerator maintain its temperature?

Can dormitory refrigerators be used to store vaccines?

Vaccine safety in 'Vaccines for Children' programs.?

What should I worry about when I store vaccines in refrigerators?

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