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Temperature Data Logger.

TR-51A Temperature Recorder data logger is compact, water resistant one channel temperature logger. Temperature Range: -40 to +80 °C, Resolution: 0.1 °C.
 TR-51A Temperature Data Logger can be used on both normal outdoor conditions and in harsh environments such as underground, in snow and frozen conditions as well as in environments where temperature varies greatly.
TR-51A Temperature Logger is outfitted with internal sensor and a water resistant rating for temporary immersion.

Temperature data logger

Model  Description 
TR-51A   Temperature Recorder data logger

Compact / Lightweight / Water Resistant.
The lightweight yet durable water resistant construction allows you to use this unit under the harshest of conditions. It can be reliably used in high condensation areas, refrigerated and frozen environments as well as underground.
Note: The waterproofing is sufficient for most situations, but is not for continued immersion.
Wide Temperature Measuring Range -60°C to 155°C.
The TR-51A with its internal sensor can measure and record from -40°C to 80°C and theTR-52 model with its standard external sensor can measure and record from -60°C to 155°C.
Large Data Capacity: up to 16,000 Readings.
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.
Wide Selection of Recording Intervals Two Recording Methods The TR-51A gives you eight recording intervals (1 minute-1 hour) to choose from, while the TR-52 stretches those choices to fifteen (1 second-1 hour).
Each unit allows you two choices of recording method:
One Time Method: when 16,000 readings have been reached recording stops.
Endless Loop Method: when 16,000 readings have been reached it automatically overwrites oldest data.

Data logger specifications
TR-51A
Measurement Channel 1 Temperature Channel
Internal Sensor -40 to 80°C
Measurement Accuracy ±0.5°C
Measurement Resolution Display 0.1°C
Sensor Thermistor
Recording Interval 1,2,5,10,15,20,30,60 minutes  (8 variations)
Recording Capacity 16,000 Readings x 1 Channel
Measurement method*1 Endless loop method (Overwrite from the oldest data when recording capacity is full)
One Time Method (Stop recording when recording capacity is full)
LCD display Current Temperature, Recording Condition, Battery Life Warning,
and Unit of Temperature (°F and °C)
Battery Lithium battery (ER3V M) x 1 (Also available with CR2)
Battery Life *2 Approximately 2 years
Interface Optical Communication (Between a Unit and TR-50C)
Communication Speed 2,400bps (Communication Period of 3 minutes or less)
Water Resistance Capacity *3 IP67
Dimensions H62mm x W47mm x D19mm
Weight 53g (Including battery)
Temperature Resistance of Unit -40 to 80°C
Standard Sensor
Built-in
*1Lithium Battery (CR-2) can be used for this unit, however the possible temperature measurement will be - 20 to 60°C.
If you are measuring below -20°C or above 60°C, we recommend the Optional Battery Set TR-00P2
*2 Battery Life differs depending on measurement environment and battery performance.
*3 Not for continued immersion.
*4The water resistance rating with the sensor or input cable connected is IP64.