Data Loggers Measurement Type - Illuminance & UV&CO2

TR-74Ui / 74Ui-S

Estimated delivery within 4-7 working days
TR-74Ui / 74Ui-S

The "TR-74Ui Illuminance UV Recorder" is a data logger designed to simultaneously measure and record four items: Illuminance, Ultraviolet Light (UV), Temperature and Humidity. In addition to these, the TR-74Ui is also capable of displaying Cumulative Illuminance and Cumulative Amount of Ultraviolet Light in the LCD display. From dim moonlight to the summer sun, Illuminance can be measured within a wide range.

The product is an all-in-one package that includes the data logger unit, sensor and software. Simply by connecting to a PC via a USB connection and carrying out a few easy steps, the measurement and recording of data can be started.

Not only can recorded data be easily downloaded to a PC via USB communication, but it can also be collected from data loggers via infrared communication to our T&D Data Collector TR-57DCi (sold separately). The TR-57DCi enables the user to gather and check recorded data on the spot without having to manually gather the data loggers.


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Product TR-74Ui TR-74Ui-S
Temperature-Humidity Sensor (External) THA-3151 SHA-3151 High-Precision Type
Thermistor Polymer Resistance Thermistor Polymer Resistance
Measurement Channels Temperature 1ch Humidity 1ch Temperature 1ch Humidity 1ch
Units of Measurement °C, °F %RH °C, °F 0 to 99 %RH (*1)
Measurement Range 0 to 55°C 10 to 95%RH -25 to 70 °C 0 to 99%RH
Accuracy ±0.5°C ±5%RH [at 25°C, 50%RH]

±0.3°C at 10 to 40 °C ±0.5°C all other temperatures

±2.5 %RH at 15 to 35 °C, 30 to 80 %RH
 Measurement Resolution  0.1°C  1%RH  0.1°C  0.1%RH
 Response Time (90%)  Approx. 7 min.   Approx. 7 min. 
 Illuminance-UV Sensor (External)     ISA-3151
 Units of Measurement     

Illuminance: lx, Klx
UV intensity: mW/cm2

 Measurement Range     

Illuminance: 0 lx to 130 Klx
UV Intensity: 0 to 30 mW/cm2

Units of Cumulative Measurement     

Cumulative Illuminance: lxh, Klxh, Mlxh
Cumulative amount of UV Light: mW/cm2, W/cm2

 Display Range of Cumulative      

Measurement Illuminance: 0 lxh to 90 Mlxh
UV Intensity: 0 mW to 62 W/cm2h


Illuminance: 10 lx to 100 Klx:±5 % [at 25°C, 50 %RH]
UV Intensity: 0.1 to 30 mW/cm2:±5 % [at 25°C, 50 %RH] (*2)

 Relative Spectral Response     

Illuminance: Approximated to the CIE standard response function V (λ )
UV Intensity: 260 to 400 nm

 Measurement Resolution     

Illuminance: Minimum of 0.01 lx
UV Intensity: Minimum of 0.001 mW/cm2

 Response Time (90%)     

3 sec. (at recording interval of 1 sec.)
6 sec. (at other intervals)

 Logging Capacity     8,000 data sets (One data set consists of readings for all channels in that type of unit.)
 Recording Interval     Select from 15 choices: 1, 2, 5, 10, 15, 20, 30 sec. or 1, 2, 5, 10, 15, 20, 30, 60 min.
 Recording Mode (*3)     Endless (Overwrite oldest data when capacity is full) or One Time (Stop recording when capacity is full)
 LCD Display Items     

Measurements, Battery Life Warning, etc.
- Measurements: Illuminance / UV Intensity / Temperature / Humidity / Cumulative Illuminance / Cumulative amount of UV Light
- Display Pattern: Alternating or Fixed display
- Display Digits: Up to 4 digits

 Communication Interfaces USB Communication, Serial Communication (RS-232C) (*4), Infrared Communication (IrPHY 1.2 low power)
 Communication Time     

Downloading time for one unit at full capacity
- Via USB communication: approx. 45 sec.
- Via infrared communication: approx. 60 to 80 sec.

 Power AA Alkaline Battery (LR6) x 1
 Battery Life (*5) Approx. 6 months
 Dimensions H 55 mm x W 78 mm x D 18 mm
 Weight About 62 g (including battery, excluding sensor)
 Operating Environment Temperature: -10 to 60°C Humidity: 90 %RH or less (no condensation)
 Accessories AA alkaline battery (LR6), USB Communication Cable (US-15C), Illuminance-UV Sensor (ISA-3151), Temperature-Humidity Sensor (THA-3151 or HHA-3151), Software (CD-ROM), User's Manual Set (Warranty Included)

*1: When continually used in environments with temperatures above 60°C, accuracy of humidity measurements will decrease over time. Also, humidity cannot be measured at temperatures below -20°C.

*2: Compared to the value measured by the T&D standard sensor for calibration under our calibration light source.

*3: If you wish to use infrared communication to download recorded data, it is necessary to purchase the Data Collector TR-57DCi ( sold separately ).

*4: Customers wishing to write their own software, please contact your local distributor for the serial communications protocol specifications. ( Note: Optional serial communication cable TR-07C is also required. )

*5: Battery life varies depending upon multiple factors including ambient temperature, recording interval, frequency of communication, and battery performance. All estimates are based on operations carried out with a new battery and are in no way a guarantee of actual battery life. When infrared communication function is enabled, battery life may be shortened if the unit is used under the inverter type fluorescent lighting.

The specifications listed above are subject to change without notice.



1: Sensor Jack
2: POWER Button
3: LCD Display
4: DISPLAY Button
5: INTERVAL Button
6: REC/STOP Button
7: USB Communication Cable Jack
8: Temperature/Humidity Sensor Area
9: Sensor Case
10: Sensor Connector
11: Illuminance Light Receiving Area (Materials: Polycarbonate)
12: Ultraviolet Light Receiving Area (Materials: Glass)
13: Sensor Connector 

Application Examples

* In art museums and other exhibit forums to manage illuminosity and help prevent deterioration of exhibits
* Management during all aspects of plant and food production
* For use in the development, testing, manufacture and sales of products for cutting UV rays
* UV reduction management in schools from kindergartens to universities
* For home and office use in the management or illuminosity and UV rays
* Design and management of homes and architectural buildings
* For managing the reduction of UV rays at swimming pools, the ocean, mountains and in parks
* For management and adjustment of illuminosity for photography and film
* For management in the production, storage and sales of foodstuffs and beverages
* For use at supermarkets, convenience stores and drugstores in UV product sales promotion materials 



Measure and Record Illuminance, Ultraviolet Light (UV), Temperature and Humidity

TR-74Ui Illuminance UV Recorder is a data logger designed to simultaneously measure and record four items: Illuminance, Ultraviolet Light (UV), Temperature and Humidity. This versatile data logger can be applied in a wide range of applications, from business to personal use. 

Temperature/Humidity Sensor Selection

The TR-74Ui standard package includes our THA-3151 Temperature/Humidity Sensor and the TR-74Ui-H high precision package includes our HHA-3151 Temperature/Humidity Sensor.


View Cumulative Illuminance and Cumulative Amount of Ultraviolet Light in LCD Display

In addition to Illuminance, Ultraviolet Light (UV), Temperature and Humidity, the TR-74Ui is also capable of displaying Cumulative Illuminance and Cumulative Amount of Ultraviolet Light in the LCD display.

Cumulative Illuminance Display Range: 0 to 90,000,000 lx·h Cumulative Amount of Ultraviolet Light Display Range: 0 to 62W/cm²·h 

Measure Illuminance within Wide Range

From dim moonlight to the summer sun, Illuminance can be measured within a wide range. 

Illuminance Measurement Range: 0 to 130,000 lx

View and record Illuminance in Resolutions to 0.01 lx

High resolutions of up to 0.01 lx make it possible to measure even under less light conditions. 

Simultaneously View Four Measurement in One Easy-to-Read Graph

The recorded data downloaded from TR-74Ui Units is read by the Multi-scale Graph and the data of four items, Illuminance, Ultraviolet Light (UV), Temperature and Humidity, can be simultaneously viewed in graph or tabular form as well as printed or output.

Large Logging Capacity: 8,000 Data Sets

The TR-74Ui Illuminance UV Recorder can measure and record up to 8,000 data sets. (One data set consists of readings for all channels: Illuminance, Ultraviolet Light, Temperature and Humidity.) At the longest recording interval of 60 minutes, a Unit can record one year's worth of measurements.

* The battery life for a TR-74Ui Unit is about 6 months. In order to record measurements consecutively for 1 year, the battery should be periodically changed. Battery life varies depending upon the type of battery, the battery performance, the measuring environment, and the frequency of communication. 

Transmit Recorded Data to PC via USB Connection

It is possible to connect a TR-74Ui Unit directly to your computer with a USB cable. If the computer has more than one USB port, it is possible to connect multiple TR-74Ui Units to one computer at the same time.

Connecting more than one TR-74Ui Unit at a time can only be done if using Windows 7 and Windows Vista.

Moreover, it is possible to gather current readings from the TR-74Ui connected to your computer and view those readings in the computer display.