Quick Summary
Any space pressure measurement can be exposed to radiation, temperature extremes, launch loads, materials, and mission-specific qualification. Hardened parts and rugged design can help deal with some of those issues. Engineers, however, need to check out the installed signal chain and hold onto proof of calibration, since a space-rated product designation does not encompass an entire spacecraft measurement system.
A spacecraft pressure reading can influence decisions when physical access to the sensor is impossible. A space-rated pressure transmitter must therefore do more than measure accurately on a laboratory bench. Engineers need confidence in its electrical behavior, mechanical construction, and performance across the mission environment.
What a Space-Rated Pressure Transmitter Must Handle
Orbital equipment faces conditions that ordinary industrial installations may never encounter. Radiation can affect electronics, launch exposes hardware to vibration, and temperature changes can move measurement offsets. The design must address the actual mission conditions rather than a generic idea of space.
Stellar Technology offers the ST1300 space-rated pressure sensor, which combines amplified voltage output, all-welded stainless steel construction, and radiation-hardened electronics. Its electronic components meet the stated Grade 1 requirements of EEE-INST-002.
That is a starting point for engineering review, not a substitute for the spacecraft requirements. Specify the mission duration, radiation environment, pressure range, and temperature exposure. Those details determine which design evidence and additional tests the program needs.
Include ground handling in that requirements review. Storage, transport, and integration procedures can expose flight hardware to loads or contamination before the mission begins.
Keep Radiation From Becoming a Measurement Problem
Electronic components can respond differently to accumulated radiation and individual particle events. Engineers evaluate those effects against the expected orbit and mission duration. A sensor suitable for one program may require further assessment for another.
Radiation-hardened parts reduce particular vulnerabilities, but the surrounding electronics also matter. Power conversion, receiving circuits, and communication hardware belong in the review. Protecting the sensing package alone leaves other possible failure paths unaddressed.
Define acceptable behavior as well as acceptable exposure. The system may need to detect an invalid reading, recover from an upset, or flag lost communication. Those responses should come from the mission architecture and verified tests.
Control Temperature Effects Across the Signal Chain
Pressure transducers change electrically as temperature changes. Compensation reduces specified errors over a defined range, but engineers must still compare that range with flight conditions. Temperature at the sensing element may differ from the electronics or mounting structure.
Vacuum also changes heat transfer. Designers cannot assume that cooling observed in an air-filled laboratory will remain representative in flight. Review the thermal path through the assembly and test the configuration used by the spacecraft.
Calibration should capture the conditions needed to interpret flight data. If pressure and temperature interact significantly, a room-temperature calibration alone may leave gaps. Retain correction coefficients and their applicable limits with the mission documentation.
Design Connections for Launch and Flight
The sensing element may survive launch while a poorly restrained cable does not. Evaluate connectors, mounting hardware, pressure fittings, and wire routing as parts of the same assembly. Mechanical robustness has to extend beyond the sensor housing.
Consider pressure cycling and unexpected loading during ground operations too. Filling, purging, and isolation can expose a sensor to conditions different from its normal flight task. Include those events when specifying overload limits and procedures.
Material compatibility remains a separate question. Wetted materials must suit the gas or liquid being measured under the expected temperature and pressure. A space-oriented electronic design does not establish compatibility with every propellant or process medium.
Qualify the Installed Measurement System
Qualification demonstrates performance against defined requirements using an agreed test program. Identify which evidence applies to the exact sensor configuration and which applies only to a related design. Changes in connectors, electronics, or mounting may need additional review.
Test the sensor with the receiving electronics where practical. Excitation, grounding, analog conversion, and filtering can influence the final pressure value. Subsystem testing can reveal errors that separate component certificates would miss.
Build the uncertainty budget around the required mission decision. A measurement used for fine scientific reconstruction may need different evidence from one used for coarse equipment monitoring. The intended use determines the acceptable error and test coverage.
Preserve Evidence Through Integration
Record serial numbers, calibration results, configuration changes, and test conditions throughout integration. These records link the delivered unit to the performance evidence. They also help engineers investigate differences between ground measurements and flight data.
Our ST130 space-rated transducers offer a bridge-output alternative for orbital applications with external conditioning requirements. Choosing between bridge and amplified outputs depends on the spacecraft signal architecture.
Make Pressure Data Worth Trusting in Flight
Space pressure measurement succeeds when sensor design, installation, and qualification agree with the mission. Treat radiation, thermal behavior, mechanical connections, and data interpretation as linked engineering tasks. That discipline makes each pressure value more useful when the hardware is beyond reach.
Match Orbital Pressure Measurement to Your Mission
We manufacture ST1300 space-rated pressure sensors at Stellar Technology for orbital measurement applications. Contact our team to discuss your mission environment and electrical requirements.
FAQs
Does a space-rated sensor qualify my complete assembly?
No. The mission program must evaluate the installed assembly and verify its performance against the applicable requirements.
Why test a pressure sensor in a vacuum environment?
Vacuum changes heat transfer and can reveal behavior that differs from laboratory operation in air. Testing should represent relevant flight conditions.
Should the receiving electronics be included in calibration?
Include them when their behavior materially affects the final pressure value. A subsystem calibration can capture interactions between the sensor and electronics.