Product ID:
TR-77Ui   High accuracy  Temperature and Humidity Data Logger (USB)


The TR-77Ui is our innovative temperature and humidity data logger designed to measure and record
in a wider range with more precision than ever before. It reaches the high measurement accuracy of
±2.5%RH and can measure and record in the range of 0 to 99%RH (at temperatures from -30 to 80°C).

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.

Application Examples
DataLoggers examples
* For managing Temperature and Humidity in Pharmaceutical Companies and Research Institutes
* For evaluating Heat and Humidity Retention in Homes and Office Buildings
* For managing Temperature and Humidity in Server Rooms
* For Temperature and Humidity Management in Hospitals, Museums, and Temperature Controlled
* For managing Temperature and Humidity in Wine Production and Storage
* Management of Temperature and Humidity in Subway and Train Cars
* For managing Temperature and Humidity in Clean Rooms and Environmental Testing Facilities

Measure and Record Temperature and Humidity in a Wider Range with Greater Accuracy
T&D's innovative technology provides higher precision measurements of temperature and humidity
within an even wider range than ever before.

Humidity Measurement Range        0%RH to 99%RH
Temperature Measurement Range        -30°C to 80°C
Humidity Measurement Resolution        0.1%RH
Humidity Measuring Accuracy        10 to 40°C: ±0.3°
At all other temperatures: ±0.5°C
Humidity Measuring Accuracy        ±2.5%RH (25°C, 10%RH to 85%RH)
Humidity Sensor Response Time        About 20 sec. (90% response)
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Improved Sensor Durability
If the attached sensor becomes wet for a short time, it can still be used again by drying it quickly at
room temperature.
If a not sufficiently dried sensor becomes wet again even for a short time, the sensor life may be
adversely affected.

Extend Sensor Cable up to 10 Meters
By using the optional extension cables(*) it is possible to place the sensor up to 10 meters away from
the TR-77Ui Unit.
*) Each TR-1C30 cable can extend the sensor by three meters. It is necessary to connect three
TR-1C30 cables to extend the sensor up to ten meters.

Easy-to-Use USB Computer Connection
USB cable connection makes it a snap to connect a TR-77Ui Unit to your computer.
For computers with more than one USB port, it is possible to connect multiple TR-77Ui Units to one
computer at the same time.

Large Logging Capacity: 8,000 Data Sets
One data set consists of readings for both temperature and humidity.
At the longest recording interval of 60 minutes, recording can continue for 1 year.
The battery life for a TR-77Ui Unit is about 10 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.

Simultaneously View Multiple Channels of Data in Trend Graph
With our exclusive software, it is possible not only to monitor the current measurements, but also to view
those measurements in a continually changing graph on your computer display at the same time.
Graphs can be opened for the same number of Units as are connected and can be viewed

Adjustment Function Equipped
By entering the adjustment values beforehand, it is possible to view and record the adjusted
measurement values.
Adjustment values are written directly into the sensors themselves, not into the Units. Therefore, when
replacing a sensor, it is necessary to re-set any desired adjustment settings into the newly connected

Slim, Lightweight and Compact
Our exclusive technology has allowed T&D to design and manufacture a high performance yet
affordable and compact Unit (55 x 78 x 18mm, 62g).

The front of the Unit, which is smaller than a credit card, is compact yet easy-to-read.

10 Months of Operation with just 1 AA Alkaline Battery
Our special low energy consumption design gives you ten months of continuous operation with only one
AA alkaline battery.

As the battery allows for measurement and recording over long periods of time there is no need to
worry about where you place it; whether it is in transit or in a distant place.
Battery life varies depending upon the type of battery, the battery performance, the measuring
environment, and the frequency of communication. The stated specifications are based on operations
carried out with a new battery and are in no way a guarantee of your actual battery life.

Measurement Items        Temperature        Humidity
Number of
Measurement Channels        2 Ch (1 Temperature / 1 Humidity)
Measurement Range        -30 to 80°C        0 to 99%RH
Measuring Accuracy(*1)        ±0.3°C [10 to 40°C]
±0.5°C [all other temperatures]        ±2.5%RH [at 25°C and 10% to 85%RH]
±4.0%RH [at 25°C and 0% to 10%RH or 85% to 99%RH]
Add ±0.1%RH/°C (When at other than 25°C, add to the accuracy noted above)
Humidity Hysteresis        -        ±1.5%RH or lower(*2)
Measurement /
Display Resolution        0.1°C        0.1%RH
Sensor        A Platinum Resistance Sensor        Electrostatic Capacitance Type
Recording Interval        Select from 15 choices: 1, 2, 5, 10, 15, 20, 30 sec. / 1, 2, 5, 10, 15, 20, 30, 60
Logging Capacity(*3)        8,000 data sets
Recording Modes        Endless Mode
(Overwrite oldest data when capacity is full)
One Time Mode
(Stop recording when capacity is full)
LCD Displayed Items        Measurements (Ch.1 only, Ch.2 only, alternating display) / Measurement and
Recording Status / Battery Life Warning / Amount of Recorded Data / Unit of Measurement
Power        1 AA Alkaline Battery (LR6)
Battery Life(*4)        About 10 months
Interface        USB Communication, Serial (RS-232C) Communication(*5)
USB Communication
Time        When downloading 1 Unit at full logging capacity: about 8 sec.
Dimensions /
Weight of TR-77Ui Unit        H55 x W78 x D18 mm / about 62 g (including 1 AA battery)
Operating Environment        Temperature: -10 to +60°C / Humidity: under 90%RH (no condensation)
Attached Sensor        HHA-3151 x 1
Included in Package        AA alkaline battery LR6 x 1
USB Communication Cable x 1
US-15C; length 1.5m
Software (CD-ROM) / Hardware User's Manual (Warranty) / Software User's Manual

*1) When used at temperatures equal to or higher than 0°C, the Humidity Measuring Accuracy will be as
shown here.
*2) When used at temperature / humidity equal to or lower than the following: 50°C/75%RH,
60°C/50%RH, 70°C/35%RH, 80°C/25%RH
*3) One data set consists of readings for all channels in that type of unit.
*4) Battery life varies depending upon the type of battery, the measuring environment, the frequency of
communication, and the ambient temperature in which it is used.When infrared communication function
is enabled, battery life may be shortened if the unit is used under the inverter type fluorescent lighting.
*5) If necessary, serial communication can be established by using our TR-77Ui communication protocol
(contact your local dealer) to write a software program. In this case, it will be necessary to connect to
your computer using our optional serial communication cable (TR-07C). Please contact the dealer
where the product was purchased or the T&D Sales Department.

TR-77Ui Dimensions
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: Serial Communication Cable Jack (RS-232C)
9: Temperature/Humidity Sensor Area
10: Sensor Case
11: Sensor Connector

Tel: 886-2-2737-5866
Fax: 886-2-2737-3343
E-mail: ;
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