Typical Application Scenarios: High-Risk Areas Across the Pharmaceutical Process

Gas detection equipment in the pharmaceutical industry must be precisely deployed to address high-risk points in API production, formulation processing, laboratories, utility systems, and storage/logistics:

(1) API Production Workshops

● Reactors and Synthesis Areas:

1) Hydrogen (H₂): In catalytic hydrogenation reactions (e.g., nitro reduction to amino), hydrogen is supplied via pipelines or storage tanks. Leaks from pipe flanges, valves, or reactor seals can accumulate in reaction zones or equipment bottoms (hydrogen, being lighter than air, gathers at the top). Thermal conductivity or infrared hydrogen detectors(resistant to interference, suitable for high-temperature and high-pressure environments) are required.

2) Organic Solvent Vapors (e.g., Acetone, Ethanol): Large quantities of organic solvents are used in extraction and purification. If ventilation hoods or local exhaust systems fail or solvents spill, vapors may accumulate in low-lying areas (for heavier-than-air solvents like dichloromethane) or at the top (for lighter-than-air solvents like methanol). PID photoionization detectors (for VOCs) or catalytic combustion detectors (for light hydrocarbons)are deployed.

3) Ammonia (NH₃): Used in some synthesis reactions (e.g., amide formation) or workshop disinfection. Pipeline leaks can diffuse irritating gases. Electrochemical ammonia detectors(detection limit ≤5 ppm, response time ≤60 seconds) are installed.

● Drying and Crushing Areas: Residual organic solvents in drying equipment (e.g., spray dryers, fluidized bed dryers) may volatilize, requiring VOC monitoring to prevent dust explosions or solvent poisonings.

(2) Formulation Production Workshops (Sterile/Non-Sterile)

● Clean Areas (e.g., Filling Lines, Sterile Rooms):

1) Anesthetic Gases (e.g., Nitrous Oxide, Isoflurane): If used in animal experiments or special formulation R&D, leaks can contaminate clean air (affecting drug sterility) and harm operators. Dedicated anesthetic gas detectors(e.g., infrared nitrous oxide detectors) or PID composite sensors are installed.

2) VOCs: Residues from cleaning agents (e.g., alcohol, acetone) or packaging materials (e.g., inks) may cause air quality issues. VOC detectorsare linked to cleanroom HVAC systems to adjust ventilation rates.

3) Oxygen (O₂): If clean areas use nitrogen protection (e.g., for certain biologics storage), local oxygen concentration must be monitored to prevent hypoxia (threshold: ≤19.5% VOL alarm).

● Non-Clean Areas (e.g., Packaging Lines): Organic solvents (e.g., inks, adhesives) may release VOCs, requiring PID detectorsin packaging material storage or coating stations.

(3) Laboratories (R&D and Quality Control)

● Chemical Synthesis Laboratories: Small-scale/intermediate API synthesis involves frequent use of hydrogen (reduction reactions), chlorine (chlorination reactions), and hydrogen sulfide (sulfur-containing compound handling). Multi-gas composite detectors(e.g., H₂+Cl₂+NH₃+VOCs combinations) are installed near fume hoods or experiment benches to monitor reactions in real time.

● Biological Laboratories (Cell Culture, Animal Experiments): Animal anesthesia (nitrous oxide, isoflurane) or cell culture incubators (if using special gases like CO₂, requiring CO₂leak monitoring) may release anesthetic gases. Dedicated anesthetic gas detectors (e.g., infrared types) are used.

● Analytical Testing Laboratories: Instruments like HPLC and GC use organic solvents (e.g., methanol, acetonitrile). Instrument rooms or waste liquid storage areas require VOC monitoring to prevent solvent vapor accumulation.

(4) Utility Systems and Auxiliary Facilities

● Boiler Rooms and Heating Systems: If natural gas (methane) or hydrogen is used as fuel, pipeline leaks may cause explosions (methane explosive limit: 5%–15%); incomplete combustion may produce carbon monoxide (CO). Catalytic combustion methane detectorsand electrochemical CO detectors are installed.

● Wastewater Treatment Stations: Anaerobic treatment of sulfur-containing wastewater (e.g., from API production) may release hydrogen sulfide (low concentrations have a rotten egg odor; high concentrations are lethal). Electrochemical H₂S detectors(detection limit ≤1 ppm) are installed above equalization tanks and anaerobic reactors.

● Refrigeration Systems (Cold Rooms/HVAC Units): If ammonia refrigeration is used (rare in pharmaceuticals), ammonia detectorsare installed in machine rooms and pipeline valve rooms (ammonia is lighter than air, accumulating at the top).

(5) Storage and Logistics

● Raw Material/Finished Product Warehouses: Warehouses storing volatile raw materials (e.g., alcohol, acetone) or anesthetic drugs (e.g., inhaled anesthetics) require VOC or anesthetic gas leak monitoring to prevent cargo contamination or personnel poisoning.

● Gas Storage Areas: Tanks storing liquid ammonia, hydrogen, or compressed gases require fixed gas detectors(e.g., ammonia, hydrogen-specific) with leak containment berms and emergency shutoff valves.