Skip to main content
Go to accessibility notice


    Apollo Command Module Environmental Control System Hardware: Steam Duct Pressure Transducer, AiResearch Part 837036 (Contract NAS-9-150). A metal box, 4.625" (overall) x 1.5" x 2.75", with a multi-pin electrical connector and a screw-on pressure connector on opposite ends. A metal ID plate along one side presents the following data: "Consolidated Controls Corp./ Bethel Connecticut/ Transducer, Pressure/ CCC Part No. 41PD24-4/ Date of Mfg. 10/66/ Mfg'd for Airesearch Per 837036-1-1/ [Serial No] 0009211". The top metal plate is not present and the internal components and potting are visible. Included are several pages copied from a 1973 abstract prepared by AiResearch for the NASA MSC titled "Environmental Control System Transducer Development Study". It reads, in part: "The initial design of steam duct pressure transducer PN 837036 was implemented on the Apollo Block I and Block II ECS. Because of numerous failures this design was superseded by a new design, PN 836706, which was implemented on Apollo Block II ECS. The pressure transducer, in the Apollo ECS application, measures the static pressure of the fluid in the glycol and suit evaporator steam discharge duct. The fluid pressure serves as an indication of the effectiveness of the evaporative cooling process in the ECS. The transducer is located in the steam discharge duct immediately downstream of the junction of the glycol evaporator and the suit evaporator outlets. This transducer converts a signal corresponding to the sensed pressure into a proportional electrical signal used for telemetry purposes or visual display." Very fine with a few minor dings on the ID plate.

    Shipping, Taxes, Terms and Bidding
    Calculate Standard Domestic Shipping

    Sales Tax information  |  Terms and Conditions

    Bidding Guidelines and Bid Increments

    Glossary of Terms

    Auction Info

    Auction Dates
    November, 2014
    12th Wednesday
    Bids + Registered Phone Bidders: 0
    Lot Tracking Activity: N/A
    Page Views: 410

    Buyer's Premium per Lot:
    25% on the first $100,000 (minimum $14), plus 20% of any amount between $100,000 and $1,000,000, plus 12% of any amount over $1,000,000 per lot.

    Sold for: Sign-in or Join (free & quick)

    Heritage membership

    Join Now - It's Free

    1. Past Auction Values (prices, photos, full descriptions, etc.)
    2. Bid online
    3. Free Collector newsletter
    4. Want List with instant e-mail notifications
    5. Reduced auction commissions when you resell your
    Consign now
    • Cash Advances
    • More Bidders
    • Trusted Experts
    • Over 200,000 Satisfied Consignors Since 1976
    Consign to the 2018 November 1 - 2 Space Exploration - Dallas.

    Learn about consigning with us

    The department director has the heart of a true and highly knowledgeable collector with the business acumen of someone who has been not only successful but has decades of an impeccable track record
    David Greenburg,
    Chicago, IL
    View More Testimonials receives more traffic than any other auction house website. (Source:

    Video tutorial

    Getting the most out of search

    Recent auctions

    2018 May 11 Space Exploration Signature Auction - Dallas
    2018 May 11 Space Exploration Signature Auction - Dallas
    REALIZED SO FAR $1,140,582