Four-Parameter Data Logger for UV, Illuminance, Temperature and Humidity
Comprehensive Environmental Monitoring in One Compact Instrument
The T&D TR-74Ui and TR-74Ui-S are designed for applications that require simultaneous monitoring of ultraviolet radiation, illuminance, temperature and relative humidity. By combining four critical environmental measurements into a single portable data logger, these instruments help users evaluate conditions that may affect sensitive materials, products, research samples or controlled environments.
These data loggers are widely used in museums, archives, libraries, research laboratories, greenhouses, pharmaceutical facilities, educational institutions, manufacturing plants and quality assurance departments. Users appreciate their ability to record both instantaneous readings and cumulative UV and light exposure, making them particularly valuable where long-term environmental exposure must be documented. Compared to using multiple standalone instruments, the TR-74Ui simplifies monitoring while reducing equipment costs and data management time.
Monitor Four Environmental Parameters Simultaneously
Four Measurements in One Device
The TR-74Ui and TR-74Ui-S simultaneously measure and record illuminance, ultraviolet intensity, temperature and relative humidity. In addition to current measurements, they calculate and display cumulative illuminance and accumulated UV exposure, providing a more complete picture of environmental conditions over time.
Monitoring cumulative exposure is especially useful when evaluating the long-term effects of light and UV radiation on artwork, photographs, documents, packaging materials, plastics and other light-sensitive products.
Designed for Conservation and Environmental Monitoring
These recorders are particularly well suited for museums, galleries, archives and libraries where preserving valuable collections requires careful control of environmental conditions. By tracking light, UV, temperature and humidity together, facility managers can better understand exposure levels and optimize storage or display conditions.
High-Accuracy Version Available
The TR-74Ui-S incorporates a high-precision temperature and humidity sensor for applications requiring tighter environmental control. It is especially suitable for laboratories, pharmaceutical storage, conservation facilities and research environments where improved accuracy is important.
Simple USB Configuration
Configuration and data retrieval are performed through a direct USB connection. Users can configure logging intervals, recording modes and download stored measurements using the included software, while basic recording operations can also be controlled directly from the logger.
Standalone Data Collection
Once configured, the logger operates independently at the monitoring location. It stores up to 8,000 complete data sets, with each record containing readings from all four measurement channels.
Easy Data Analysis
Downloaded data can be viewed as tables or graphs using T&D software. Users can review historical trends, compare environmental conditions over time and generate documentation for quality control or regulatory purposes.
When connected to a computer, the software can also display live measurement values, making it useful for spot-checking environmental conditions during testing or installation.
Main Features
- Simultaneously measures illuminance, UV intensity, temperature and relative humidity
- Displays cumulative illuminance and cumulative UV exposure
- Illuminance measurement range from 0 to 130 klx
- UV intensity measurement range from 0 to 30 mW/cm²
- Stores up to 8,000 complete four-channel data sets
- 15 selectable recording intervals from 1 second to 60 minutes
- Continuous or one-time recording modes
- Large LCD displaying measurements and recorder status
- Direct USB communication with PC
- Compatible with T&D software for graphing and analysis
- Powered by one AA alkaline battery
- Typical battery life of approximately six months
- Compact lightweight design weighing approximately 40 g
Specifications
| Model | TR-74Ui | TR-74Ui-S |
|---|---|---|
| Temperature & Humidity Sensor | ||
| Channels | Temperature: 1 Humidity: 1 |
Temperature: 1 Humidity: 1 |
| Sensor | THA-3151 | SHA-3151 High Accuracy |
| Units | °C, °F, %RH | °C, °F, %RH |
| Temperature Range | 0 to 55°C | -25 to 70°C |
| Humidity Range | 10 to 95% RH | 0 to 99% RH (above -20°C) |
| Temperature Accuracy | ±0.5°C | ±0.3°C (10 to 40°C) ±0.5°C otherwise |
| Humidity Accuracy | ±5% RH | ±2.5% RH |
| Resolution | 0.1°C / 1% RH | 0.1°C / 0.1% RH |
| Illuminance & UV Sensor | ||
| Sensor | ISA-3151 | |
| Illuminance Range | 0 to 130 klx | |
| UV Range | 0 to 30 mW/cm² | |
| Data Capacity | 8,000 complete data sets | |
| Recording Intervals | 1, 2, 5, 10, 15, 20, 30 seconds or 1, 2, 5, 10, 15, 20, 30, 60 minutes | |
| Recording Modes | Continuous or One-Time | |
| Communication | USB 2.0 (Mini-B) | |
| Power Supply | 1 AA alkaline battery | |
| Typical Battery Life | Approximately 6 months | |
| Dimensions | 55 × 78 × 18 mm | |
| Weight | Approx. 40 g | |
| Operating Environment | -10 to 60°C, 90% RH or less (non-condensing) | |
Additional Notes
- The TR-74Ui-S offers improved temperature and humidity accuracy through its high-precision sensor.
- Humidity measurements below -20°C are not supported with the SHA-3151 sensor.
- Actual battery life varies depending on recording interval, communication frequency and ambient temperature.
- USB communication cable and sensors are supplied with the recorder.
- T&D software is available for configuration, downloading and graphical analysis of recorded data.
Q&A
What does the TR-74Ui measure?
The TR-74Ui simultaneously measures illuminance, UV intensity, temperature and relative humidity while also calculating cumulative light and UV exposure.
What is the difference between the TR-74Ui and the TR-74Ui-S?
The TR-74Ui-S uses a higher-accuracy temperature and humidity sensor, making it better suited for laboratories, archives and other environments where tighter environmental control is required.
Why is cumulative UV measurement important?
Many materials deteriorate because of total UV exposure over time rather than momentary intensity. Tracking cumulative UV helps evaluate long-term damage risk to artwork, documents, textiles and sensitive products.
Can this data logger be used in museums and archives?
Yes. It is specifically well suited for monitoring lighting conditions, UV exposure, temperature and humidity around valuable collections and exhibits.
Can the TR-74Ui monitor greenhouses?
Yes. It can help greenhouse operators monitor environmental conditions affecting plant growth by recording light, UV exposure, temperature and humidity simultaneously.
How many measurements can the logger store?
The internal memory stores up to 8,000 complete data sets, each containing readings from all four measurement channels.
How are the recorded measurements downloaded?
Data is transferred directly to a Windows computer through the built-in USB interface using T&D software.
Can I view graphs of the recorded data?
Yes. T&D software allows recorded measurements to be displayed as graphs and tables for analysis and documentation.
Does the logger require external power?
No. It operates on a single AA alkaline battery with a typical operating life of approximately six months, depending on usage.
Does the instrument measure UVA and UVB separately?
No. The UV sensor measures total UV intensity across its specified spectral response range and does not display separate UVA and UVB values.
Can the recorder display live measurements?
Yes. When connected to a computer, the software can display current measurement values in addition to downloading stored data.
Is the logger suitable for long-term environmental monitoring?
Yes. Its long battery life, internal memory and flexible recording intervals make it well suited for continuous monitoring over extended periods.
Four-Parameter Data Logger for UV, Illuminance, Temperature and Humidity
Comprehensive Environmental Monitoring in One Compact Instrument
The T&D TR-74Ui and TR-74Ui-S are designed for applications that require simultaneous monitoring of ultraviolet radiation, illuminance, temperature and relative humidity. By combining four critical environmental measurements into a single portable data logger, these instruments help users evaluate conditions that may affect sensitive materials, products, research samples or controlled environments.
These data loggers are widely used in museums, archives, libraries, research laboratories, greenhouses, pharmaceutical facilities, educational institutions, manufacturing plants and quality assurance departments. Users appreciate their ability to record both instantaneous readings and cumulative UV and light exposure, making them particularly valuable where long-term environmental exposure must be documented. Compared to using multiple standalone instruments, the TR-74Ui simplifies monitoring while reducing equipment costs and data management time.
Monitor Four Environmental Parameters Simultaneously
Four Measurements in One Device
The TR-74Ui and TR-74Ui-S simultaneously measure and record illuminance, ultraviolet intensity, temperature and relative humidity. In addition to current measurements, they calculate and display cumulative illuminance and accumulated UV exposure, providing a more complete picture of environmental conditions over time.
Monitoring cumulative exposure is especially useful when evaluating the long-term effects of light and UV radiation on artwork, photographs, documents, packaging materials, plastics and other light-sensitive products.
Designed for Conservation and Environmental Monitoring
These recorders are particularly well suited for museums, galleries, archives and libraries where preserving valuable collections requires careful control of environmental conditions. By tracking light, UV, temperature and humidity together, facility managers can better understand exposure levels and optimize storage or display conditions.
High-Accuracy Version Available
The TR-74Ui-S incorporates a high-precision temperature and humidity sensor for applications requiring tighter environmental control. It is especially suitable for laboratories, pharmaceutical storage, conservation facilities and research environments where improved accuracy is important.
Simple USB Configuration
Configuration and data retrieval are performed through a direct USB connection. Users can configure logging intervals, recording modes and download stored measurements using the included software, while basic recording operations can also be controlled directly from the logger.
Standalone Data Collection
Once configured, the logger operates independently at the monitoring location. It stores up to 8,000 complete data sets, with each record containing readings from all four measurement channels.
Easy Data Analysis
Downloaded data can be viewed as tables or graphs using T&D software. Users can review historical trends, compare environmental conditions over time and generate documentation for quality control or regulatory purposes.
When connected to a computer, the software can also display live measurement values, making it useful for spot-checking environmental conditions during testing or installation.
Main Features
- Simultaneously measures illuminance, UV intensity, temperature and relative humidity
- Displays cumulative illuminance and cumulative UV exposure
- Illuminance measurement range from 0 to 130 klx
- UV intensity measurement range from 0 to 30 mW/cm²
- Stores up to 8,000 complete four-channel data sets
- 15 selectable recording intervals from 1 second to 60 minutes
- Continuous or one-time recording modes
- Large LCD displaying measurements and recorder status
- Direct USB communication with PC
- Compatible with T&D software for graphing and analysis
- Powered by one AA alkaline battery
- Typical battery life of approximately six months
- Compact lightweight design weighing approximately 40 g
Specifications
| Model | TR-74Ui | TR-74Ui-S |
|---|---|---|
| Temperature & Humidity Sensor | ||
| Channels | Temperature: 1 Humidity: 1 |
Temperature: 1 Humidity: 1 |
| Sensor | THA-3151 | SHA-3151 High Accuracy |
| Units | °C, °F, %RH | °C, °F, %RH |
| Temperature Range | 0 to 55°C | -25 to 70°C |
| Humidity Range | 10 to 95% RH | 0 to 99% RH (above -20°C) |
| Temperature Accuracy | ±0.5°C | ±0.3°C (10 to 40°C) ±0.5°C otherwise |
| Humidity Accuracy | ±5% RH | ±2.5% RH |
| Resolution | 0.1°C / 1% RH | 0.1°C / 0.1% RH |
| Illuminance & UV Sensor | ||
| Sensor | ISA-3151 | |
| Illuminance Range | 0 to 130 klx | |
| UV Range | 0 to 30 mW/cm² | |
| Data Capacity | 8,000 complete data sets | |
| Recording Intervals | 1, 2, 5, 10, 15, 20, 30 seconds or 1, 2, 5, 10, 15, 20, 30, 60 minutes | |
| Recording Modes | Continuous or One-Time | |
| Communication | USB 2.0 (Mini-B) | |
| Power Supply | 1 AA alkaline battery | |
| Typical Battery Life | Approximately 6 months | |
| Dimensions | 55 × 78 × 18 mm | |
| Weight | Approx. 40 g | |
| Operating Environment | -10 to 60°C, 90% RH or less (non-condensing) | |
Additional Notes
- The TR-74Ui-S offers improved temperature and humidity accuracy through its high-precision sensor.
- Humidity measurements below -20°C are not supported with the SHA-3151 sensor.
- Actual battery life varies depending on recording interval, communication frequency and ambient temperature.
- USB communication cable and sensors are supplied with the recorder.
- T&D software is available for configuration, downloading and graphical analysis of recorded data.
Q&A
What does the TR-74Ui measure?
The TR-74Ui simultaneously measures illuminance, UV intensity, temperature and relative humidity while also calculating cumulative light and UV exposure.
What is the difference between the TR-74Ui and the TR-74Ui-S?
The TR-74Ui-S uses a higher-accuracy temperature and humidity sensor, making it better suited for laboratories, archives and other environments where tighter environmental control is required.
Why is cumulative UV measurement important?
Many materials deteriorate because of total UV exposure over time rather than momentary intensity. Tracking cumulative UV helps evaluate long-term damage risk to artwork, documents, textiles and sensitive products.
Can this data logger be used in museums and archives?
Yes. It is specifically well suited for monitoring lighting conditions, UV exposure, temperature and humidity around valuable collections and exhibits.
Can the TR-74Ui monitor greenhouses?
Yes. It can help greenhouse operators monitor environmental conditions affecting plant growth by recording light, UV exposure, temperature and humidity simultaneously.
How many measurements can the logger store?
The internal memory stores up to 8,000 complete data sets, each containing readings from all four measurement channels.
How are the recorded measurements downloaded?
Data is transferred directly to a Windows computer through the built-in USB interface using T&D software.
Can I view graphs of the recorded data?
Yes. T&D software allows recorded measurements to be displayed as graphs and tables for analysis and documentation.
Does the logger require external power?
No. It operates on a single AA alkaline battery with a typical operating life of approximately six months, depending on usage.
Does the instrument measure UVA and UVB separately?
No. The UV sensor measures total UV intensity across its specified spectral response range and does not display separate UVA and UVB values.
Can the recorder display live measurements?
Yes. When connected to a computer, the software can display current measurement values in addition to downloading stored data.
Is the logger suitable for long-term environmental monitoring?
Yes. Its long battery life, internal memory and flexible recording intervals make it well suited for continuous monitoring over extended periods.
