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The 1625A Portable Reference Thermometer features four input channels, supporting temperature measurements for PRTs, thermistors, and thermocouples. It is powered by a lithium battery and equipped with a 5-inch touch LCD screen. The device has an internal memory for data storage and also supports data storage and retrieval using a USB flash drive. With convenient operation, comprehensive functions, and portable design, it meets the requirements for on-site precise tempertuare measurement, collection, and recording.
The 1625A Portable Reference Thermometer features four input channels, supporting temperature measurements for PRTs, thermistors, and thermocouples. It is powered by a lithium battery and equipped with a 5-inch touch LCD screen. The device has an internal memory for data storage and also supports data storage and retrieval using a USB flash drive. With convenient operation, comprehensive functions, and portable design, it meets the requirements for on-site precise tempertuare measurement, collection, and recording.
Features
Simultaneous 4-channel acquisition, with adjustable sampling speeds of slow/medium/fast.
Four-wire connection eliminates the impact of lead wire resistance in PRTs.
Automatic current reversal function to eliminate errors due to thermoelectric emf in transmission
PRT measurement supports two-wire, three-wire, and four-wire configurations, supports ITS90, CVD, and general PT temperature calculations
Thermistor measurement supports two-wire and four-wire configurations, support for R(T), T(R), and other temperature calculations.
Thermocouple measurement supports external reference junction and fixed reference junction, support for type B, E, J, K, N, R, S, T, and Au-Pt temperature calculations.
Users can set digital recursive averaging filtering to improve stability.
Provides internal storage for long-term testing, and also supports USB data export.
5-inch touch screen and color display, for setting, channel control, realtime temperature and resistance value displaying.
Communication interfaces includes USB-B and LAN, supporting remote control.
Specifications
General
|
Input Channels |
4 channels |
|
Sampling Frequency (Hz) |
4 channels synchronized collection, 0.5 or 1 or 2 seconds per round |
|
Individual Channel Control |
Yes |
|
Sensor Interface |
Press-fit |
|
Ethernet Port |
RJ45 |
|
USB Communication |
USB Type-B |
|
USB Storage |
USB Type-A |
|
Communication Protocol |
Custom |
|
Software |
Temperature Acquisition Software ZCDAQ Temp |
|
Power Consumption (W) |
≤3 |
|
Power Supply |
4.2V |
|
Dimensions |
195*149*53mm |
|
Weight |
1200g |
|
Operating Time |
Over 15 hours continuous use |
PRT Temperature Measurement Accuracy
| Temperature（℃） | PT25（Reference resistor：25Ω） |
PT100（Reference resistor：100Ω） |
PT1000（Reference resistor：10kΩ） |
| -100 | ±0.006℃ |
±0.006℃ |
±0.014℃ |
| 0 |
±0.007℃ |
±0.007℃ |
±0.014℃ |
| 100 |
±0.009℃ |
±0.009℃ |
±0.014℃ |
| 200 |
±0.012℃ |
±0.012℃ |
±0.014℃ |
| 400 | ±0.018℃ |
±0.018℃ |
±0.018℃ |
| 600 | ±0.024℃ |
±0.024℃ |
±0.024℃ |
*The temperature measurement accuracy of the PRT is based on the four-wire measurement method and does not include the error of the PRT itself.
Resistor Temperature Measurement Accuracy
| Temperature（℃） | 2.252kΩ | 5kΩ |
10kΩ |
| 0 |
±0.0015℃ | ±0.0020℃ |
±0.0020℃ |
| 25 | ±0.0030℃ | ±0.0015℃ |
±0.0015℃ |
| 50 |
±0.0080℃ | ±0.0040℃ | ±0.0020℃ |
| 75 |
±0.0200℃ | ±0.0080℃ |
±0.0040℃ |
| 100 | ±0.0450℃ | ±0.0200℃ |
±0.0100℃ |
*Thermistor temperature measurement accuracy is based on a four-wire measurement method and does not include thermistor's own error.
Thermocouple Temperature Measurement Accuracy
|
Thermocouple Type |
Temperature Measurement Range ℃ |
Measurement Accuracy ℃ |
| S |
-20~100 | 2.1 |
| 100~300 | 1.4 | |
| 300~1768 | 1.2 |
|
| T | -250~ -100 | 1.8 |
| -100~0 | 0.4 |
|
| 0~400 | 0.3 | |
| K |
-200~0 |
0.8 |
| 0~300 | 0.3 | |
| 300~800 | 0.4 |
|
| 800~1372 | 0.5 |
*Thermocouple temperature measurement accuracy does not include the cold end temperature error, and does not include the error of the thermocouple material itself.
*Thermocouple types support R, S, B, J, T, E, K, N, Au-Pt, please refer to the user manual for complete accuracy indicators.
Voltage Measurement Accuracy
|
Voltage measurement range |
Accuracy (% of reading + basic deviation) |
| -15~75mV | 0.010%+10uV |
Resistance Measurement Accuracy
|
Resistance Range |
Reference resistor |
Excitation Current |
Accuracy |
| 0-120Ω | 25Ω | 1mA | 0.0025%or0.0005Ω whichever is greater |
| 0-400Ω | 100Ω |
1mA |
0.0025%or0.002Ω whichever is greater |
| 0-10kΩ |
10kΩ |
100uA |
0.0025%or0.05Ω whichever is greater |
| 0-10kΩ |
10kΩ |
10uA | 0.0050%or0.2Ω whichever is greater |
| 10k-50kΩ |
10kΩ |
10uA | 0.0080% |
| 50k-100kΩ |
10kΩ |
2 uA | 0.0150% |
| 100k-500kΩ |
10kΩ |
2 uA |
0.0300% |
* Resistance measurement accuracy is based on four-wire measurement. Platinum resistance three-wire measurement has an additional error of 0.05Ω.
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