Low-temperature sensor for liquid helium and liquid hydrogen DT670

DT670 Technical Parameters and Application Areas:The liquid helium cryogenic sensors provided by Henan Zhaosheng offer higher accuracy over a wider temperature range. They feature high precision, high reliability, and are widely used in space equipment, cryogenic refrigeration industries, scientific research, and other fields. The DT670 series liquid helium cryogenic sensors utilize specialized cryogenic materials suitable for low-temperature measurements, offering higher accuracy, a broader temperature range, and relatively higher voltage at low temperatures for easier measurement compared to standard cryogenic sensors. The DT670-CU follows a standard voltage-temperature response curve, making the DT670 series interchangeable without requiring individual calibration in many applications.

The CU-encapsulated DT670 offers a selection of sensor grades for cryogenic temperatures ranging from 1.4K to 500K. For applications requiring higher accuracy, the DT670-CU diode temperature sensor also provides full-range calibration from 1.4K to 500K.
Features of the DT670 Cryogenic Temperature Sensor:
Low excitation current, resulting in minimal self-heating effect;
Complies with standard curves, ensuring excellent interchangeability;
Multiple encapsulation options, resistant to damage, temperature shock, and easy to install;
The DT670 thermometer provides good measurement accuracy across a wide temperature range of 1.4K to 500K;
Multiple encapsulation options: CU, PI, BC, MS;
Excitation current: 10µA;
Repeatability: ±30mK@4.2K; ±30mK@77K; ±30mK@300K;
 Power dissipation at recommended excitation: 20µW@4.2K; 10µW@77K; 6µW@300K;
Temperature drift: ±10mK/year@4.2K; ±40mK/year@77K; ±25mK/year@300K;
Magnetic field requirement: T≥60K @ B≤3T;
Cryogenic sensor leads can be customized in length according to customer requirements.
DT670 Thermometer Grade Temperature Range Calibration Range Accuracy
C 4K~325K None ±1K
4K~500K None ±1.5K
4L 4K~325K 4K~325K ±0.1K
2.5L 2.5K~325K 2.5K~325K ±0.1K
4H 2.5K~500K 2.5K~500K ±0.1K
Thermometer Accuracy = (Calibration Uncertainty² + Repeatability²)^0.5
2.5L/ ± 30mK@1.4K~10K 4L/± 30mK@4K~30K
Typical Response Curve Sensitivity
Encapsulation Types and Dimensions:
To meet the needs of different users, our company offers various thermometer encapsulation types and dimensions. The following are common encapsulation forms and their specific dimensions. We can also design according to customer requirements.
MS: Metric thread CU: Spool encapsulation PI: Tube encapsulation BC: Bare die
Note: This encapsulation is suitable for DT670, Cernox, and other small-sized sensor dies.
Ordering Instructions
Uncalibrated Sensors
Step 1: Determine the sensor series, e.g., DT670-CU-C
Step 2: Select the sensor accuracy grade, e.g., DT670-CU-B
Calibrated Sensors
Step 1: Determine the sensor series, e.g., DT670-CU-3L
Step 2: Select the sensor calibration range, e.g., DT670-CU-1.4L
Product Parameters:
Temperature Range: 4K~325K
Standard Curve: DT670
Recommended Excitation Current: 10µA ±0.1%;
Repeatability: 10mK@4.2K, 16mK@77K, 75mK@273K;
Maximum Reverse Voltage: 75V;
Maximum Current Before Damage: 200mA continuous or 1A instantaneous;
Power Dissipation at Recommended Excitation: 20µW@4.2K; 10µW@77K; 6µW@300K;※ BC Encapsulation Response Time: 10ms@4.2K, 100ms@77K, 200ms@305K;※ Radiation Impact: Recommended only for low-radiation environments;
Magnetic Field Impact: Not recommended for strong magnetic field environments (not exceeding 2T). Typical Response Curve and Sensitivity

GM Refrigerator Thermometer Price
Grade Temperature Range Calibration Range Accuracy  Listed Price
C 4K~325K None ±1K  950 RMB
4K~500K None ±1.5K  1200 RMB
4L 4K~325K 4K~325K ±0.1K  2200 RMB
2.5L 2.5K~325K 2.5K~325K ±0.1K  2600 RMB
4H 2.5K~500K 2.5K~500K ±0.1K  3200 RMB
Thermometer Accuracy = (Calibration Uncertainty² + Repeatability²)^0.5
2.5L/ ± 30mK@1.4K~10K 4L/± 30mK@4K~30K  For Cryogenic Experiment Sensors, bulk customization is negotiable