CMT-64 Silicon Diode Cryogenic Thermometer

Name: CMT-64 Silicon Diode Cryogenic Thermometer
Brand: Vectomag

CMT-64 silicon diode thermometer delivers accurate cryogenic temperature readings with high repeatability and excellent V-T curve consistency.

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1. Product Overview

The CMT-64 Silicon Diode Cryogenic Thermometer is engineered with specially designed silicon diodes optimized for low-temperature measurement. Compared with conventional silicon diodes, the CMT-64 provides excellent repeatability, low variability, and higher resistance changes at cryogenic temperatures, making measurements easier and more reliable.

All CMT-64 diodes follow a well-defined Voltage-Temperature (V-T) curve, ensuring better interchangeability across sensors.

3. Technical Specifications

Lead length: 1 m, 4-wire configuration
Lead material: Phosphor bronze cryogenic wire (four-color)
Standard curve: CMT-64 standard curve
Temperature range: 4 K to 325 K
Recommended excitation current: 10 µA ±0.1%
Maximum reverse voltage: 75 V
Maximum current before damage: 100 mA (continuous), 500 mA (instantaneous)
Power dissipation at recommended excitation: 20 µW @ 4.2 K 10 µW @ 77 K 6 µW @ 300 K
Radiation influence: Recommended only in low-radiation environments
Magnetic field influence: Not recommended in magnetic field environments
Short-term stability: 1 mK @ 4.2 K 5 mK @ 77 K 3 mK @ 273 K (tested for 1 minute in liquid helium, liquid nitrogen, and ice-water mixture)
Repeatability: ±10 mK @ 77 K (tested through 100 thermal cycles between 300 K and 77 K)

5. System Configuration

Main sensor: CMT-64 Silicon Diode Cryogenic Thermometer
Standard lead length: 1 m, 4-wire configuration
Multiple package types available (MS, BO, PI)

2. Key Features

Low excitation current minimizes self-heating effects
Standard V-T curve compliance ensures excellent sensor interchangeability
Multiple package options: durable, resistant to thermal shocks, and easy to install

4. Testable Samples & Applications

Cryogenic material research
Superconductivity studies
Low-temperature detector calibration
General laboratory cryogenic monitoring

Available Packages

MS: Metric screw mount
BO: Bobbin package
PI: Tube package

6. Ordering Information

Model: CMT-64 Silicon Diode Cryogenic Thermometer
Package options: MS, BO, PI
Standard lead: 1 m, phosphor bronze wire
Calibration: Refer to CMT-64 standard curve

Temperature Range & Accuracy

Calibration Type	Temperature Range	Standard Range	Accuracy
A	2 K – 100 K / 100 K – 325 K	N/A	±0.25 K / ±0.5 K
B	2 K – 325 K	N/A	±0.5 K
C	2 K – 325 K	N/A	±1 K
1.4L	1.4 K – 325 K	1.4 K – 325 K	±0.1 K
1.4H	1.4 K – 500 K	1.4 K – 500 K	±0.1 K
4L	4.2 K – 325 K	4 K – 325 K	±0.1 K
4H	4.2 K – 500 K	4 K – 500 K	±0.1 K
70L	70 K – 325 K	70 K – 325 K	±0.1 K
70H	70 K – 500 K	70 K – 500 K	±0.1 K

Accuracy definition: Temperature accuracy = √(Calibration uncertainty² + Repeatability²)

Pricing & availability

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