SI-415 Silicon Diode Temperature Sensor

SI-415 Silicon Diode Temperature Sensor
SI-415 Silicon Diode Temperature Sensor

HSL is now also able to supply the Scientific Instruments Model Si-415 Silicon Temperature Sensors. They operate over a wide temperature range and are miniature in size. They are also linear over a wide temperature range interval and have high sensitivity in their lower range. The silicon diode temperature sensors are interchangeable with a standard V/T curve.

Model Si-415 Standard Configuration
Model Si-415 and Si-420 sensors normally mount in a gold-plated copper case. These include four 36 AWG polyimide coated, colour-coded, phosphor bronze leads. The case size is 0.093″ diameter by 0.250″ long.

Sensor Accuracy / Interchangeability

As you review our various sensor types, you will notice that we offer the advantage of Grouping and Interchangeability. We presently offer five levels of interchangeability/accuracy. The cryogenic temperature sensors come in these three categories:

  • Uncalibrated
  • Grouped
  • Calibrated


As the name implies, an uncalibrated sensor is provided to our customers to represent a particular sensor type. However, it has no specific calibration information. For advanced users, they may also calibrate their own devices/sensors specific to their requirements.


Furthermore, certain sensor types exhibit interchange resistance or voltage output characteristics to a standard curve. Furthermore, grouping sensors offered by Scientific Instruments include:

  1. Si-415 Silicon Diode
  2. RO-l05 Ruthenium Oxide
  3. RO-600 Ruthenium Oxide

The ability to offer interchangeable sensors comes from a thorough analysis and understanding of the basic material. The primary advantage to “grouping” sensors is that they all adhere to a standard V/T or R/T curve. Furthermore, this eliminates the need and expense of an individual calibration. Moreover, the Si-415 sensor tests will be in liquid helium, liquid nitrogen and ice. Each sensor must also repeat in liquid helium ± 0.01 K over a ten cycle test. The sensors group according to the following table:

SI-415 Silicon Diode Temperature Sensor – Accuracy & Interchangeability

SI-415 Group A

+/-0.3K from 1.5K to 25K

+/-0.5K from 25K to 450K

SI-415 Group AA

+/-0.1K from 1.5K to 25K

+/-0.5K from 25K to 450K

SI-415 Group D

+/-0.5K from 1.5K to 450K

Finally, for more information and to discuss your requirements, please call us. Alternatively, please leave a message via our Contact us page out of hours or during public holidays and weekends. We will get back to you as soon as possible.