ThermoREC is an application for making TR4 settings and monitoring temperature data via graphs.
By collecting and plotting data in graph form from logger(s), it provides a way to constantly monitor important temperature changes. The data displayed in Graph View is automatically uploaded to T&D WebStorage Service.
Android 4.4 or later, iOS 9.0 or later

Top Screen
  • App Version Number Display
  • App Settings
    • Temperature Unit: °C or °F (default is °C)
    • Daylight Savings Time: ON or OFF (Android version only; default is OFF)
  • Support
    • Help (this document)
    • T&D Website
    • About Purchasing (distributors list)
Device Name: up to 16 characters
Current Readings / Data Acquisition Date and Time
Tap the measurement to open the graph for the device. See: Graph View
Favorite (star icon)
Data loggers selected as favorites are pinned to the top of the list; the order of favorites can be changed as desired.
See: Sorting Favorites
indicates the battery level is sufficient.
indicates the battery level is low. (Bluetooth communication may not work properly.)
You will lose all data if the battery drains completely; make sure to replace the battery as soon as possible.
These indicate that Device Lock is ON.

See: Device Settings > Device Lock
Dashed Line
This will appear when a sensor has not been connected or the wire has been broken.
Multiple Unit Selection (Android version only)
Allows you to select up to 4 units to display in the same graph.
See: Graph View > Multiple Unit Selection (Android version only)
[Operations] Menu 
  • View in Graph: Displays temperature data from the selected logger in graph form.
    See: Graph View
  • Make Settings: Opens the Device Settings screen where you can check/change settings as well as start/stop recording.
    See: Device Settings
  • See Graph Archives: Opens the screen where you can specify the period for the archived graph data to be viewed in graph, sent as file, or deleted.
    See: Graph View > Archived Graph Data

Sorting Favorites

For Android

Press and hold the device name until the cell turns gray. Then drag the cell to the desired location.

For iOS

Tap "Edit", press and hold the icon on the right side of the measurement, and then drag to the desired location. When sorting is finished, tap "Done".

By opening Graph View, data monitoring and the downloading of recorded data will start.
Both "recorded data" and "monitoring data" will be uploaded to T&D WebStorage Service upon return to the previous (Top) screen.

See: How to Use the T&D WebStorage Service > Recorded Data and Monitoring Data

Reading the Display

Graph View
Returns to the previous page.
Date, Time and Measurement / Cursor
Press and hold on the graph to display a cursor. The time and measurement of the cursor's position will appear above the graph.
Pauses or resumes monitoring (graph drawing)
Graph Area
You can pinch in/out to change the graph range.
Data Display Range (16 choices; scroll horizontally)
5min, 10min, 30min, 1hr, 2hr, 6hr, 12hr, 1day, 3day, 1wk, 2wk, 1mon, 2mon, 3mon, 6mon, 1yr.
Monitoring Interval (5 choices)
5sec, 10sec, 30sec, 1min, 2min
Shows the device name and the current reading of the monitored device(s).
(Up to 4 units for Android)

Multiple Unit Selection (Android version only)

  1. Click .

  2. Select up to 4 units to display in the same graph.

  3. Tap "VIEW IN GRAPH".

Multiple Unit Selection

Archived Graph Data

  1. In the Top screen click Operations Icon for the desired device.

  2. In the menu which appears, select [See Graph Archives].

  3. Specify the period for the archived graph data and select "View in Graph", "Send as File" or "Delete".

In Device Settings you can check the device info, change the recording settings, and start/stop recording.
To open Device Settings, select a target device in the Top screen, tap Operations Icon and then "Make Settings".

To change the settings, tap on the necessary item from ② to ⑤.

Device Information Model Number, Serial Number, Firmware Version
Recording Settings
Device Name
Adjustment After adjustment settings have been made to a logger, it will display and record only the post-adjusted readings.
  • 1 Point Adjustment: Use this to adjust all measurements with the same offset.
  • 2 Point Adjustment: Use this to adjust measurements in a wide range or when adjustment cannot be carried out using only one point.
See: Adjustment Examples
Device Lock Select ON or OFF. Device Lock protects data from being read or changed by unauthorized persons. When Device Lock is set to ON, the lock icon is displayed in the Top screen.
See: Device Settings > Device Lock

Recording Intervals and Maximum Recording Times

Rec. Interval 1 sec 30 sec 1 min 10 min 60 min
Time Period About 4 hours About 5 days About 11 days About 111 days About 1 year and 10 months

Recording Mode (Endless / One Time)


Overwrite the oldest data when logging capacity is full.

One Time

Recording automatically stops when logging capacity is full.

Adjustment Examples

When you are carrying out adjustment settings and formulating equations please take care with the settings and take personal responsibility for the process.

1 Point Adjustment

This adjustment method changes only the intercept (b) where the slope (a) is considered to be the value of "one".
For example, the data logger is measuring 10.2°C, but the standard says the actual measurement should be 100°C. Enter 10.2 in the "Before" box and 10 in the "After" box. The conversion equation will be Y=X-0.2 and for all measurements an adjustment to the offset of -0.2 will be made.

2 Point Adjustment

The adjustment equation will be calculated from two points: the slope (a) and the intercept (b).
For example, the data logger is measuring 0.2°C and 9.6°C , but the standard says the actual measurements should be 0°C and 100°C. Enter 0.2 and 9.6 in the "Before" boxes and 0 and 10 in the "After" boxes. In this case the slope (a) is (10 - 0) / (9.6 - 0.2) = 1.06.
The conversion equation is Y=1.06X-0.213 with the intercept being -0.213.

Important Notes
  • Making adjustment settings will not guarantee the improvement of measurement accuracy for the whole measurement range.
  • If you replace a sensor that was connected when making adjustment settings, it is necessary to re-make any desired settings to be written into the newly connected sensor.
  • By making new adjustment settings to an already adjusted device without first clicking the Initialize button, the new adjustment equation will be used to further adjust the previously adjusted result. Please be careful that in this case, the difference between the actual measurement (original value) and the post-adjusted value will be bigger than it should be.
    EX: When changing 0 to 0.1 (+0.1) in the first adjustment and 0 to 0.2 (+0.2) in the second adjustment, the difference will be 0.3 (0.1+0.2).
  • For "2 point Adjustment", it is important to make sure the points are not too close to each other. The probability of measurement errors will increase in other ranges outside of the two points. It is recommended to make the space between the two points 20% or more of the measurement range for the Remote Unit.
  • When carrying out adjustment to the slope, adjustments will become larger in areas outside of the 2 points which were entered.

Device Lock

When Device Lock is set to ON, instead of a measurement, the word "LOCK" and the lock icon are displayed in the Top screen.

How to Turn off LOCK display (restart communication)
  1. Tapping "LOCK" will open the Registration Code entry screen.
    Enter the 8-digit number that is printed on the supplied Registration Code Label.

  2. Your smartphone or tablet will resume communication with the logger and start plotting in the Graph View screen. Measurements will be displayed upon return to the Top screen.
    Note: The lock icon will remain on until the Device Lock setting is turned off.

How to Remove the Device Lock
  1. After turning off the LOCK display, tap Operations Icon in the Top screen.

  2. In the menu which appears, select "Device Settings".

  3. Tap "Device Lock" and change to OFF.
    The lock icon will disappear upon return to the Top screen. Now the device is unlocked, and operations from any smartphone, tablet, or device with Bluetooth low energy are possible.