A Technician Loading Reagent Bottles at the Top While Checking Tubing and Flow Control Valves Below (Updated last month)

You can view this bundle in the SFSU Over the Years collection area.

• A technician likely loading or adjusting reagent bottles at the top, while also checking or calibrating tubing and flow control valves below.• The hand below may be inspecting connections or ensuring flow to waste or collector vessels is intact.• He may also be replacing tubing or adjusting the manifold for a different test sequence (e.g., ammonia, phosphate, nitrate, etc.).

Tags: faculty, staff, and administration , historic technology

Added to SFSU Over the Years on September 1, 2026.

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Information

  • Identifier: TP-ATA-1936
  • Date: Nov 1971
  • Context: <p><strong>Devices:</strong></p> <ul> <li><strong>Technicon AutoAnalyzers</strong>&nbsp;(AutoAnalyzer II or similar):<br /> These machines perform continuous flow analysis (CFA), where liquid reagents and samples are drawn through narrow tubing and processed via chemical reactions and colorimetric detection.</li> <li><strong>Reagent/Sample Bottles:</strong><br /> The small plastic bottles hanging on the front of each unit contain reagents or possibly prepared liquid samples. These are gravity-fed or drawn through peristaltic pumps into the reaction train.</li> <li><strong>Tubing &amp; Flow Paths:</strong><br /> All the colored and clear tubing carry samples, reagents, and air bubbles, which separate segments to prevent mixing and allow for continuous analysis.</li> </ul> <p><strong>Glass Mixing Coils (possibly internal):</strong><br /> These help blend reagents and samples over time to ensure complete reactions before the mixture passes through detectors.</p> <p>&nbsp;</p> <p style="caret-color: #000000; color: #000000; font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 11px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration: none;"><strong>Credits:</strong>&nbsp;</p> <p style="caret-color: #000000; color: #000000; font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 11px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration: none;">Some technical descriptions and historical interpretations were developed with the assistance of ChatGPT, an AI language model by OpenAI.</p>
  • Geographic Coverage: San Francisco, CA
  • Temporal Coverage: 1970s
  • Type: Still Image
  • Format: Negative
  • Source: San Francisco State University Archives
  • Rights: Public

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