JT-31 Precision Digital Thermometer - Product

JT-31 is a precision handheld thermometer.

Designed to be used in as many situations as possible where precise temperature, resistance and voltage measurements are required. It can be connected to various types of RTD and thermocouple temperature sensors.

Users can manually enter temperature-temperature and resistance-temperature calibration values for precise nonlinear calibration. The resistance measurement range is 0~300Ω, and the typical accuracy can reach 3mΩ.

JT-31 can be used in the laboratory or carried to the field, which is light and convenient.

Performance Index

Resistance measurement accuracy (AT25℃)

Range	Resolution (typical)	Error (maximum)
300Ω	0.0005Ω	0.005Ω

DC voltage measurement accuracy (AT25℃)

Range	Resolution	Error
70mV	0.5μV	3μV

Optimal accuracy after matching sensor (AT25℃)

Range	Sensor model	Resolution	Error
-50 to 200	PT100	0.001 ℃	± 0.05 ℃
-70 to 300	PT100	0.001 ℃	± 0.1 ℃
-70 to 650	N-type thermocouple	0.01 ℃	± 0.4 ℃
650 to 1100	N-type thermocouple	0.01 ℃	± 2 ℃
-70 to 300	T-Type thermocouple	0.01 ℃	± 0.15 ℃
0 to 650	S-type thermocouple	0.02 ℃	± 0.6 ℃
650 to 1100	S-type thermocouple	0.02 ℃	± 1.5 ℃

Note 1: The PT100 sensor uses an integral sintered outer-wound ceramic platinum resistor. If other PT100 components are selected, the accuracy and stability depend on the stability and repeatability of the component.

Note 2: The sensor model and temperature range listed in the table are the most commonly used, the most stable, and the most representative sensor and temperature range. If you want to confirm other models and temperature ranges and accuracy, please contact with the manufacturer.

Temperature Drift

Project	Impact per 1 ℃ change of environment (maximum)
Resistance	5ppm×READ
Voltage	20ppm×READ

Electrical characteristics The parameter conditions given in this table are: ambient temperature 25 ℃

Project	Condition	Typical value
Power consumption		0.3W
Resistance measurement sampling time	Step change> 3mΩ	0.8s
Resistance measurement sampling time	Step change <3mΩ	5s
Thermocouple measurement sampling time		1s