TandD RTR-502B

  • External temperature sensor
  • Measuring range: -60°C to 155°C
  • Operating range: -40°C to 80°C (-30°C to 80°C during wireless communication)
  • Measurement display resolution: 0.1°C
  • 16,000 point memory
  • Measures in both °C, °F
  • Wireless communication range of up to 150 meters (500 feet)
  • LCD Display
  • Battery life of about 10 months
  • Data can be collected remotely via: USB, GSM technology, LAN and handheld data collectors
  • WebStorage Service available
  • Additional Base Station required for communication



Additional Equipment Required


TandD RTR-502B Temperature Data Logger

The RTR-502B is a temperature data logger with an external sensor and quick response to changes in temperature. It has a large selection of optional sensors with a wide measurement range (-60℃ to +155℃), which provides extra versatility to match your situation. It also has a waterproof rating of IP64 (splash-proof).

The brand new RTR-500B series allows you to mix and match an array of wireless radio communication loggers with various Base Units or Data Collectors to meet your needs. Logged data can be automatically sent via network or mobile communication to be saved in cloud storage or to a specified location.

RTR-502B data loggers have a wireless radio communication range with compatible base units of up to 150m (500ft).









Data can be transmitted from a logger to a base unit and then automatically uploaded to cloud storage or saved to a specified location. Data can also be checked on your PC screen or on-site with one of our compatible data collectors.

The RTR-502B is comparatively quick to follow changes in temperature and can be used with a wide variety of sensors, making it suitable for use in logging product temperature of both liquids and solids. It is also well suited for measuring ambient temperatures inside refrigeration and freezer units.

Looking for the RTR-502? The RTR-500 Series has been effectively discontinued, however, existing RTR-500 Series hardware will work with the new RTR-500B Series.

Introduction to the RTR-502B Series


Number of Channels 1 Ch (Temperature)
Unit of Measurement °C, °F
Measurement Range – 60 to 155 °C
Sensor External Temp. Sensor (TR-5106)
Thermal Time Constant Approx. 30 Sec. (in air)
Approx. 4 Sec. (in agitated water)
Response Time (90%) Approx. 80 Sec. (in air)
Approx. 7 Sec. (in agitated water)
Measurement Accuracy Avg: ± 0.3°C (-20° to 80°C)
Avg: ± 0.5°C (-40° to -20°C / 80° to 110°C)
Avg: ± 1.0°C (-60° to -40°C / 110° to 155°C)
Measurement Display Resolution 0.1°C
Recording Intervals Select from 15 choices:
1, 2, 5, 10, 15, 20, 30 sec. / 1, 2, 5, 10, 15, 20, 30, 60 min.
Logging Capacity 16,000 readings
Recording Mode Endless: Upon reaching logging capacity, the oldest data is overwritten and recording continues.
One-time: Upon reaching logging capacity, recording will automatically stop.
* When using RTR-500BW, RTR-500BM, RTR-500NW/AW, or RTR-500MBS-A as a Base Unit, only “Endless” can be selected.
LCD Display Items Current Readings, Recording Settings,
Battery Life Warning, Over Measurement Range Warning,
Amount of Recorded Data, Unit of Measurement
Power Lithium Battery (LS14250 (SAFT)) x 1
For L type: Large Capacity Battery Adaptor Kit (RTR-500B1 / sold separately)
External Power Adaptor Kit (RTR-500A1 / sold separately)
Battery Life About 10 months
L Type: About 4 years
Communication Interfaces Short Range Radio Communication
Frequency Range: 902 to 928MHz
RF Power: 7mW
Transmission Range: Approx. 150 meters (500 ft) if direct and unobstructed
Bluetooth 4.2 (Bluetooth Low Energy)
Optical Communication
Water Resistance IP64: Splash proof (rated for use in daily life)
Dimensions H 62mm x W 47mm x D 19mm
L Type:  H 62mm x W 47mm x D 46.5mm
Excluding protrusions and sensors
Antenna length: 24mm
Weight About 50g
L Type: approx. 65g
Operating Environment -40 to 80°C
-30 to 80°C during wireless communication
Accessories Temperature Sensor (TR-5106)
Lithium Battery (LS14250 or Large Capacity Battery Kit RTR-500B1), Strap (not included with L Type models), Manual Set (warranty included)
Compatible Base Units RTR-500BC, RTR-500BW, RTR-500BM

WebStorage Service

Free Online Service for Cloud Data Storage

It’s never been so easy to share your recorded data via the Internet! T&D’s free WebStorage Service is perfect for processing and managing data recorded in remote places or for allowing several people to view the same recorded data at their convenience. Users can check the current conditions of data loggers such as battery level and radio signal strength between the Base Unit and Remote Unit. Recorded data can be transmitted to the WebStorage Service from any compatible Tamp;&D product. Data storage capacity is 20MB.

Additionally, the data transmitted to T&D WebStorage Service can be accessed via your browser from anywhere, anytime, as long as an internet connection is available. Mobile device apps are also available for devices running iOS and Android.


T&D 500B Utility Software

T&D 500B Utility software is a mobile application for setting up the Base Station RTR-500BW as well as the registration of Remote Units and Repeaters via Bluetooth or the Cloud.

Download from the iOS App Store here. Compatible with iOS 11.0 or later

Note: An Android version is scheduled for availability in the coming months.