Data Loggers Measurement Type - Illuminance & UV&CO2

TR-76Ui / 76Ui-S

Estimated delivery within 4-7 working days
TR-76Ui / 76Ui-S

The "CO2 Recorder TR-76Ui" is a three-channel data logger designed to simultaneously measure and record CO2 concentration, temperature and humidity. Making atmospheric pressure settings for the measurement location ensures more stable and accurate CO2 measurements. The supplied software enables the user to download data recorded by TR-76Ui to PC via USB connection, whereby data from all three channels can be simultaneously viewed in graph or table form.

The product is an all-in-one package that includes the data logger unit, sensors and software. We offer two types of packages with different temperature/humidity sensors depending on your required measurement range and accuracy needs.

By using a Data Collector TR-57DCi (sold separately), it is possible to collect recorded data from the TR-76Ui via infrared communication and immediately check the collected data on the spot.

This versatile data logger can be used in a wide range of applications from personal to business use; for measurements of home environment, CO2 measurements in offices and other buildings, and/or energy-saving measures such as ventilation and air conditioning controls.


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Product TR-76Ui TR-76Ui-S
Temperature-Humidity Sensor (External) THA-3001 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 %RH
Measurement Range (*1) 0 to 55°C 10 to 95%RH -25 to 70 °C 0 to 99 %RH (*2)
(Note: Operating environment of the TR-76Ui itself is 0 to 45 °C, 90 %RH or less)
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.
CO2 Sensor (Internal) NDIR
Measurement Channels CO2 Concentration 1ch
Units of Measurement ppm
Measurement Range 0 to 9,999 ppm
Accuracy ±( 50 ppm + 5% of reading ) at 5,000 ppm or less (*3)
Measurement Resolution Minimum of 1 ppm
Response Time (90%) Approx. 1 min.
Logging Capacity 8,000 data sets (One data set consists of readings for CO2 concentration, Temperature and Humidity measurements.)
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 Endless (Overwrite oldest data when capacity is full) or One Time (Stop recording when capacity is full)
LCD Display Items

Measurements, Battery Level, etc.
- Measurements: CO2 concentration, Temperature or Humidity (fixed or alternating display)

Communication Interfaces USB Communication Infrared Communication IrPHY 1.2 low power (*4) Serial Communication RS-232C (*5)
Communication Time

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

External Alarm Terminal (*5)

Output Terminal: Open Drain Output

(Voltage when OFF: DC less than 30V / Current when ON: less than 0.1A / Resistance when ON: about 15Ω)

Power AC Adaptor (AD-0638 or AD-06C1), AA Alkaline Battery (LR6) x 4
Battery Life Approx. 2 days ( batteries only without AC adaptor ) (*7)
Dimensions H 96 mm x W 66 mm x D 46 mm (excluding protrusions and sensor)
Weight 214 g (including batteries, excluding sensor)
Operating Environment Temperature: 0 to 45 °C, Humidity: 90 %RH or less (no condensation)
Accessories AA alkaline battery (LR6) x 4, AC Adaptor (AD-0638 or AD-06C1), USB Communication Cable (US-15C), Temperature-Humidity Sensor (THA-3001 or HHA-3151), Software (CD-ROM), User's Manual Set (Warranty Included)

*1: Make sure to use the data logger within the operating environment as listed in the specifications.

*2: 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.

*3: Stated value is the measurement accuracy of the CO2 sensor when Auto Calibration is operating properly. A change in atmospheric pressure directly influences the reading of CO2, which can cause measurement errors; a decrease in pressure by 10hPa results in a relative decrease in CO2 by 1.6%. In such a case, we recommend carrying out the “Atmospheric Pressure Correction” function found in CO2 Recorder for Windows.

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

*5: 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. )

*6: In order to use the external alarm terminal, please prepare a compatible connector: JST PAP-04V-S.

*7: 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. Battery life may be shortened if the unit is used under inverter type fluorescent lighting.

The specifications listed above are subject to change without notice.



1. CO2 Sensor Area (Internal)
2. LCD Display
3. Infrared Communication Port
4. Operation Buttons
<DISPLAY> button, <INTERVAL> button, <REC/STOP> button
5. Battery Cover
6. Sensor Jack
7. AC Adaptor Jack
8. USB Communication Cable Jack
9. Serial Communication Cable Jack (RS-232C)
10. External Alarm Terminal (EXT ALM)
11. <POWER> switch
12. Temperature-Humidity Sensor

Application Examples

*Managing CO2, temperature and humidity in schools: from kindergartens to universities
*For home and office use in the management of CO2 concentration, temperature and humidity
*For energy-saving measures such as ventilation and air conditioning controls
*For research studies on photosynthesis and plant growth
*To use in estimations of ventilation


*This unit is not designed for use in preventing health problems.


Measure and Record CO2, Temperature and Humidity with one TR-76Ui Unit

TR-76Ui is a three-channel data logger designed to simultaneously measure and record CO2 concentration, temperature and humidity. It is capable of measuring CO2 concentrations up to 5,000 ppm.
*This unit is not designed for use in preventing health problems.

Temperature/Humidity Sensor Selection

The TR-76Ui standard package includes our THA-3001 Temperature/Humidity Sensor and the TR-76Ui-H high precision package includes our HHA-3151 Temperature/Humidity Sensor.

Simultaneously View Three Measurement Items in one Easy-to-Read Graph

The recorded data downloaded from TR-76Ui units is read in the Multi-Scale Graph where the data of three items, CO2 concentration, temperature and humidity, can be simultaneously viewed in graph or list form, as well as, printed out.

It is also possible from the graph window to calculate and view the highest, lowest and average readings for a desired range (time period).

Large Logging Capacity: 8,000 Data Sets

One data set consists of readings for all three channels: CO2 concentration, temperature, and humidity. There are 15 recording intervals (1 seconds to 60 minutes) to select from. At the longest recording interval of 60 minutes, recording can continue consecutively for one year.

Atmospheric Pressure Correction Function

This function enables the TR-76Ui software to calculate the atmospheric pressure from the altitude at the measurement location. By using a correction factor for the atmospheric pressure at the measurement location, more reliable CO2 concentration measurements can be achieved.

View Current Readings for all Three Channels on LCD

CO2 concentration, temperature, and humidity measurements are shown on the large easy-to-read LCD screen.

While CO2 measurement is always displayed, the display pattern for temperature and humidity can be selected from an alternating display of two or fixed display of either one.

Manage Recorded Data with Common Spreadsheet Software

By using the Multi-Scale Graph, data downloaded from the TR-76Ui can be saved into text format for use with common spreadsheet software.


Transmit Recorded Data to PC via USB Connection

It is possible to connect a TR-76Ui unit directly to your computer with a USB cable.
Moreover, it is possible to gather current readings from the TR-76Ui connected to your computer and view those readings in the computer display.

Easy Data Collection on the Spot: No Computer Necessary (TR-57DCi)

By using our Data Collector TR-57DCi (sold separately), it is possible to gather and check recorded data on the spot.

* TR-76Ui support on the TR-57DCi is planned for release at the end of February 2012.


Warning Function with Output Contact

When a set upper or lower limit has been exceeded, it is possible to use the provided output contact on the unit to issue a warning. This function can be used in conjunction with external devices such as a ventilation device.

* To connect to an external device, please use a JST Connector PAP-04V-S.