A Person Operating a Gas Chromatograph (GC) or a mass spectrometer (MS)
About This Item
A person operating a Gas Chromatograph (GC) or a mass spectrometer (MS)—or possibly a GC-MS hybrid system. He seems to be: Adjusting the sample introduction port or a flow control valve, possibly injecting or prepping a new sample or actively monitoring pressure and flow, ensuring stable conditions for analysis.
- Identifier
- TP-ATA-1932
- Date
- Nov 1971
- Context
Equipment Breakdown (left to right):
- Control Console / Flow Regulation Panel
- Features: Pressure gauges, rotary valves, flow meters, toggle switches.
- Purpose: This panel is likely used to control and monitor the carrier gas (e.g. helium or nitrogen), essential for transporting samples through the system. This could be a gas chromatograph or part of a vacuum system.
- The technician is adjusting a valve, likely preparing the sample injection or tuning the carrier gas flow rate.
2. Heated Injector Port / Interface
- Location: Center-right of the technician.
- Purpose: Where the sample is injected into the system. It’s likely heated to vaporize the sample for gas-phase analysis.
3. Main Analytical Instrument (Gas Chromatograph or Mass Spectrometer)
- Right-side unit with a horizontal cylindrical component and vented section.
- Purpose:
- If GC: Separates sample components over time through a capillary column.
- If MS: Ionizes separated molecules and detects them based on mass-to-charge ratio.
- The cylinder could be an electron impact ionizer, and the nearby metal detector housing might house a quadrupole or magnetic sector analyzer.
- The large grill likely covers a cooling fan or vacuum pump.
4. Data Acquisition Module
- Far-right instrument with knobs and digital display.
- Purpose: Allows the user to set scan parameters, control data capture, or calibrate the instrument.
Credits:
Some technical descriptions and historical interpretations were developed with the assistance of ChatGPT, an AI language model by OpenAI.
- Geographic Coverage
- San Francisco, CA
- Temporal Coverage
- 1970s
- Type
- Still Image
- Format
- Negative
- Source
- San Francisco State University Archives
- Rights
- Public
- Views
- 263
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