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When being used in cold environments the display may become difficult to 

read. This is not a malfunction. 

1. 

Recording Status (REC) 

LIT UP: displayed during 

recording or when FULL of data. 

BLINKING: displayed when waiting 

for a programmed recording to start

2. 

Low Battery Life Warning Indicator 

(BAT): displayed when time to 

change the battery.

3. 

Measurement Reading and Message 

Display

4. 

Unit of Measurement: displays unit 

of measurement

No Sensor Connected

Displayed when a sensor has not been 

connected, has been disconnected or 

the wire has been broken. 

Measurement and recording will 

continue and battery power consumed.

- Over measurement range (TR-52)

Temperature display blinks when the 

temperature goes below -60°C, or 

above 155°C.

- Full Memory

When using the One-time Recording 

Method, the REC mark appears when 

the number of recorded readings 

reaches 16,000 and the unit stops 

recording. 

Estimates of time until FULL is displayed.

Recording intervals

1 second

30 seconds

1 minute

10 minutes

60 minutes

Period

about 4 hours about 5 days about 11 days about 111 days

about 

1 year and 10 months

4. LCD Display

6. Communication

Setting Up for Communication

If you wish to make Recording Start settings or Download already recorded 

data, please follow the directions as written below.

1. Place the Thermo Recorder TR-51A / TR-52 face down on the 

Communication Port TR-50C (sold separately) or on the Data Collector 

RTR-57C (sold seperately).

■Communication Port

■Data Collector

                                                                                    

used in USA only

2. Connect the Communication Port or Data Collector to your computer.  

Note:

For details about making settings, see the User's Manual that comes with the 
Communication Port TR-50C or with the Data Collector RTR-57C or the [Help] Menu in the 
Software.

The following settings can be made via computer communication.

Recording Intervals

TR-51A

Select from 1,2,5,10,15,20,30,60 minutes 
(Default Setting: 10 minutes)

TR-52

Select from 1,2,5,10,15,20,30 seconds / 1,2,5,10,15,20,30,60 minutes
(Default Setting: 10 minutes)

Recording Methods

Immediate / One-time

Recording starts immediately upon battery 
installation. 
When the unit reaches 16,000 readings, the LCD 
alternately displays the current reading and FULL 
and recording stops.

Programmed / One-time

Recording starts at the programmed date and time. 
When the unit reaches 
16,000 readings, the LCD alternately displays the 
current reading and FULL and recording stops.

Immediate / Endless Loop

Recording starts immediately upon battery 
installation. 
When the unit reaches 16,000 readings, the oldest 
data is overwritten and recording continues. 

Programmed / Endless Loop

Recording starts at the programmed date and time. 
When the unit reaches 16,000 readings, the oldest 
data is overwritten and recording continues.

Unit of Temperature on 
Display

°F / °C (Initial setting value: °C)

In addition to communication, the software is designed to help with data 

processing.

Computer Display and Printing

Display downloaded data in graphs or tables and print out.

Saving Downloaded Data

- Create Files to save downloaded data into.
- Create data into Text File for exporting to spreadsheets.

* For details about all operations, see the User's Manual that comes with the 

Communication Port TR-50C or with the Data Collector RTR-57C or the [Help] 

Menu in the Software.

2. Battery Installation

5. Changing the Battery

-   Our TR-51A and TR-52 Thermo Recorders are compact, water resistant 

one channel temperature data loggers. They can be used in both normal 

outdoor conditions and in harsh environments such as underground, in 

snow and frozen conditions as well as in environments where temperatures 

vary greatly.

-   

Use our Communication Port TR-50C or our Data Collector RTR-57C to 

transmit settings to the data logger and download data to computer for 

processing. 

-   We have removed all switches from the main unit to assure nothing gets 

accidentally pushed during use, thus assuring you of no mistakes, no 
tampering and no loss of data.

-   With one unit you can record up to 16,000 readings. If set at a one hour 

recording interval that gives you 666 days or almost two years of readings.

-   We offer two types to fit your needs: the TR-51A with internal sensor with 

water resistant rating of IP 67 for temporary immersion and the TR-52 
outfitted with external sensor with splash resistant proof rating of IP 64.

-   The latest version of our software for TR-51A / 52 can be downloaded free 

of charge from our Homepage. Please visit us at  

[http://www.tandd.co.jp/english] for more information. 

■TR-51A 

■TR-52 

1. TR-51A / 52 Overview

3. About Recording Data

Temperature is immediately measured when a battery is installed.

Initial Setting Values
  Recording Interval : 10 minutes
  Recording Mode : Endless loop

Recording Intervals

TR-51A : 1,2,5,10,15,20,30,60 minutes

TR-52   : 1,2,5,10,15,20,30 seconds                  

                1,2,5,10,15,20,30,60 minutes

Recording Modes 

(TR-51A/52)

Immediate / One-time 

Programmed / One-time

Immediate / Endless Loop

Programmed / Endless Loop

To find out more about settings and how to make them, see the User’s 

Manual that comes with the Communication Port TR-50C or with the 

Data Collector RTR-57C or the [Help] Menu in the Software. 

 

Note: 

-  In some cases recording will not start immediately and nothing will 

appear in the screen or the display will be jumbled. This sometimes 

happens when the circuit board is touched during battery installation. 

Remove the battery and install again following directions as in 

 [2. Battery Installation].

-  The display may appear black if exposed to high temperatures. This is 

not a malfunction and the logger is recording. 

-  The display may be difficult to read if exposed to low temperatures. This 

is not a malfunction and the logger is recording.

-  To change the recording settings, see the User’s Manual that comes with 

the Communication Port TR-50C or with the Data Collector RTR-57C. 

1. When battery power becomes low, the battery indicator (BAT) will appear in 

the LCD display.

2. Make sure to download all data before the battery loses all power.

3. Replace with a new battery following directions as in [2. Battery 

Installation]. 

Caution!

After removing the old battery, all recorded data will be lost if a new 

battery is not inserted within 1 minute. Make sure to complete the battery 

change within 1 minute.

- Lithium Batteries (CR-2) can be used for this unit without the tube as 

shown above, however the possible temperature measurement will be 

-20 to 60

°C

    *If you are measuring in an environment below -20

°C

 or above 60

°C

we recommend the Optional Battery Set TR-00P2.

- All data such as recorded data and recording interval settings will be 

lost during battery replacement.

If the warning is displayed, replace with a new battery as soon as 

possible

(Communication frequency : 4 times / month)

1 second

2 second

5 second

10 second

Battery Life

about 6 months

about 1 year

about 1 year and  

6 months

about 2 years or 

more

TR-52

1. Remove screws and open the case.

2. Insert the attached battery into the tube and mount the tube in the direction 

shown in the figure.

-Tube is not necessary in the case of using CR2.
-Do not touch the PCB.

3. Confirm that the rubber packing does not have dust or defects.

-Dust or defects on the packing can adversely affect the waterproof 

characteristics.

4. Close the case and close the cover.

- Make sure the cover is closed in the correct direction.

5.Connect the Sensor

- Make sure to fully push in the sensor to ensure good contact. 

TR-51A

1. Remove screws and open the case.

2. Insert the attached battery into the tube and mount the tube in the direction 

shown in the figure.

-Tube is not necessary in the case of using CR2.
-Make sure not to touch the circuit board.

3. Confirm that the rubber packing does not have dust or defects.

-Dust or defects on the packing can adversely affect the waterproof 

characteristics.

4. Close the case and close the cover.

- Make sure the cover is closed in the correct direction.

LCD Display

Optical Commication 

Port

Connector

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