PR721 series precision digital thermometer adopts intelligent sensor with locking structure, which can be replaced with sensors of different specifications to meet different temperature measurement needs. The supported sensor types include wire-wound platinum resistance, thin-film platinum resistance, thermocouple and humidity sensors, which can automatically identify and load the type, temperature range and correction value of the connected sensor. The thermometer is made of aluminum alloy as a whole, with IP64 protection class, which can be used reliably in harsh environments.
Electrical Accuracy (One Year Calibration Period)Model | PR721A PR722A | PR721B PR722B | Remark |
External dimensions | φ29mm×145mm | Sensor not included | |
Weight | 80g | Weight with battery | |
Data storage capacity | 8MB(Store 320,000 sets of data) | Contains time information | |
External interface | Micro USB | Charging/data | |
Battery specifications | 3.7V 650mAh | Rechargeable lithium battery | |
Charging time | 1.5 hours | DC5V 2A charging | |
Battery duration | ≥80 hours | ≥120 hours | |
Wireless communication | Bluetooth (effective distance ≥ 10m) | ZigBee(effective distance ≥50m) | in the same space |
Electrical Accuracy (One Year Calibration Period)
Measuring range | PR721 Series | PR722 Series | Remark |
0.0000~400.0000Ω | 0.01%RD+5mΩ | 0.004%RD+3mΩ | 1mA Excitation current |
0.000~20.000mV | 0.01%RD+3μV | Input impedance≥100MΩ | |
0.000~50.000mV | 0.01%RD+5μV | ||
0.00000~1.00000V | 0.01%RD+20μV | ||
Temperature Coefficient | Resistance:5ppm/℃ Voltage:10ppm/℃ |
Resistance:2ppm/℃ Voltage:5ppm/℃ |
5℃~50℃ |
Temperature Accuracy (Converted from Electrical Accuracy)
Sensor type | PR721 Series | PR722 Series | Resolution |
Pt100 | ±0.04℃@0℃ ±0.05℃@100℃ ±0.07℃@300℃ |
±0.02℃@0℃ ±0.02℃@100℃ ±0.03℃@300℃ |
0.001℃ |
Type S thermocouple | ±0.5℃@300℃ ±0.4℃@600℃ ±0.5℃@1000℃ |
0.01℃ | |
Type N thermocouple | ±0.2℃@300℃ ±0.3℃@600℃ ±0.3℃@1000℃ |
0.01℃ | |
Reference junction compensation | ±0.15℃@RT ±0.20℃@RT±20℃ |
0.01℃ |