Aerospace Flight and Ground Support

For over half a century, Scientific Instruments has supported numerous space programs and related applications needing temperature monitoring for cryogenic fuel management. These applications include, but are not limited to, storage, transfer, and launch vehicles. Scientific Instruments’ relationship with NASA evolved from the early Apollo days to include support of the Hubble Telescope, ground support for the Space Shuttle Program, and the Delta & Atlas Launch Systems, where Scientific Instruments provided the first successful cryogenic fuel float switch for the Delta II rocket.

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Today, Scientific Instruments offers a variety of robust, customizable cryogenic temperature probes including the Series 44 and Series 46. Constructed of stainless steel and hermetically sealed, these probes are designed for use in the most extreme environments. Customization options include sensor type (Silicon diode or RTD), length, wetted surface diameter, stem profile, process connection, and electrical connectivity.

Other specialty customizations are available. Scientific Instruments also can provide acceptance testing, qualification testing, and CFD modeling as your specific application requires. Please contact our sales team for more information.

Product Specifications :

Series 44D Cryogenic Temperature Probes

Series 56 Cryogenic Temperature Probes

Series 44D Cryogenic Temperature Probes

Enclosure	All wetted areas are 316 SS.
Insertion Length	2” to 30” customer specified.
Media Connection	MS-33656-E4 Boss seal capable of withstanding 2000 PSI media pressure.
Temperature Range	Series 44B – -40°C to +290°C Series 44C – -260°C to +125°C Series 44D – -255°C to +125°C
Excitation	1.0 mA DC, four leaded. 10μA for diodes.
Ice Point Resistance	Series 44B – 200 +/- 1.0 Ohms Series 44C – 1000 +/- 1.0 Ohms
Ice Point Output	Series 44D – 0.6180 V +/- .0128 V
Sensor Coefficient	.003890 Ω/Ω/°C determined from calibration data taken at 0°C and 100°C.
(200 ohm) for use with 39C *SCM.	44B-XXX-40°C to +290°C – Ending letter (X) defined by probe insertion length available from 2” to 30” customer specified.
(1000 ohm PRT) for use with 39C *SCM.	44C-XXX-260°C to +125°C – Ending letter (X) defined by probe insertion length available from 2” to 30” customer specified.
(Silicon Diode) for use with 39D *SCM.	44D-XXX-255°C to +125°C – Ending letter (X) defined by probe insertion length available from 2” to 30” customer specified.

Series 56 Cryogenic Temperature Probes

Enclosure	All wetted areas are 316 SS.
Insertion Length	Customer specified.
Sensing Element	The sensing element is a silicon diode supported and contained in a closed housing.
Media Connection	Boss seal per MS33656E4
Temperature Range	Each unit is capable of operating within an environmental temperature range of 1.5 K (-271.66°C) to 400 K (126.85°C)
Operating Current	The operating current of the unit should be 10 microamperes (µA) ± 0.1µA for the 56D units and 100µA ± 1µA for 56DX (the sensor excitation is supplied by an external signal conditioner).
Service Media	The unit will operate in the following gaseous or liquid media where compatible with the sheath-housing material and within the temperature range of the unit: Alcohol Neon (Ne) Ammonia (NH₃) Nitrogen (N₂) Helium (He) Nitrogen teroxide (N₂O₄) Hydrogen (H₂) Oxygen (O₂) Hydrazine (N₂H₄) Unsymmetrical dimethylhydrazine (UDMH) Monomenthylhygrazine (MMH) Water (H₂O)
Repeatability	The unit is capable of repeating test parameter results under identical test conditions, within ± 0.1K (± 5 mVDC) at the boiling point of liquid helium and within ± 0.5K (1.2 mVDC) from 25 K to 400 K.
Accuracy	The unit shall be accurate to within ± 0.25K (± 12.8 mVDC) from 1.5K to 25K and within ± 0.5K (1.2 mVDC) from 25K to 400K. (46DX and 46DX1, within ± 0.75K from 273K to 400K)
Response Time	The unit shall respond within 63.2 percent of total temperature change, for a step change in temperature from 293.15 K ± 3K to 77.35 K ± 3K, within 15 seconds.