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Question

Difficulty: MediumDirect Fact Retrieval

Read the following technical passage:

Modern forward-looking infrared (FLIR) targeting pods rely on closed-cycle Stirling cryocoolers to chill mercury-cadmium-telluride sensors down to operating temperatures of approximately 77 Kelvin. At this extreme temperature, ambient thermal noise is suppressed, enabling clear detection of distant heat signatures. Technicians servicing the hermetic cooling unit must purge the compressor manifold with ultra-high-purity helium gas rather than nitrogen to avoid internal icing. During operational checkout, the system must reach thermal stabilization within eight minutes before technicians initiate optical sensor calibration.

Based on the passage, complete the statement with the exact details directly stated in the text.

Answer:Technicians servicing the unit must purge the manifold with 【ultra-high-purity helium】 gas, and the system must achieve thermal stabilization within 【eight minutes】 prior to calibration.

Answer

The compressor manifold must be purged with ultra-high-purity helium (or helium), and thermal stabilization must occur within eight minutes (or 8 minutes).
The passage directly and explicitly identifies 'ultra-high-purity helium' (or 'helium') as the gas used to purge the manifold and establishes 'eight minutes' (or '8 minutes') as the mandatory timeframe for the system to reach thermal stabilization before calibration.

Step-by-Step Solution

1
Scan the passage for the specific purging procedure and the required gas type.
The text explicitly states that technicians must 'purge the compressor manifold with ultra-high-purity helium gas rather than nitrogen.'
Locates the explicit factual requirement for the first blank while distinguishing the correct gas from the prohibited one.
2
Locate the explicit operational checkout timeframe for thermal stabilization.
The text specifies that 'the system must reach thermal stabilization within eight minutes before technicians initiate optical sensor calibration.'
Extracts the exact numerical duration designated for stabilization prior to calibration.

Key Concept

Direct Fact Retrieval
Estimated Time:1m 0s
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Topics

Direct Fact Retrieval

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