# Annual service for six (6) TSI 3321A Aerodynamic Particle Sizers (APS) and twelve (12) TSI Aerodynamic Particle Diluter Model 3302a

Canonical: https://abierto.us/opportunities/nctr2025126188

- Solicitation number: NCTR-2025-126188
- Notice type: Sources sought
- Status: Closed. Deadline was July 16, 2025 at 2:00 PM EDT
- Department: Department of Health and Human Services
- Agency: Food and Drug Administration
- Contracting office: Food and Drug Administration (75F402)
- NAICS: 811210 Electronic and Precision Equipment Repair and Maintenance
- Product or service code: J066 Maintenance, Repair and Rebuilding of Equipment: Instruments and Laboratory Equipment
- Place of performance: Shoreview, Minnesota
- County: Ramsey County (FIPS 27123). https://abierto.us/counties/ramsey-county-mn-27123
- City: Shoreview. https://abierto.us/cities/shoreview-mn-2759998
- First posted: July 7, 2025
- Last posted: July 7, 2025
- SAM.gov: https://sam.gov/workspace/contract/opp/7ba48b39baab49d8a57812dbcf64ef99/view

## Description

The U.S. Food and Drug Administration (FDA), National Center for Toxicological Research (NCTR), Division of Biochemical Toxicology requires annual service for six TSI 3321A Aerodynamic Particle Sizers (APS) and twelve TSI Aerodynamic Particle Diluter Model 3302a. Knowing particle size is critical in meeting the standards for aerosol inhalation studies.

The APS is the only instrument capable of real-time aerodynamic particle size determination in a footprint that will fit into our class III glove boxes used for toxic inhalation studies. The Aerodynamic Particle Diluters are required for bringing the particle count of our primary aerosols down to a level where they can be analyzed by the APS. See attached sources sought notice.

## Publications

- July 7, 2025: Sources sought, due July 16, 2025 at 2:00 PM EDT. Notice 7ba48b39baab49d8a57812dbcf64ef99. https://sam.gov/workspace/contract/opp/7ba48b39baab49d8a57812dbcf64ef99/view

## Points of contact

- David Kramer, david.kramer@fda.hhs.gov

---
Source: SAM.gov Contract Opportunities bulk extract. Confirm deadlines on SAM.gov before responding. Cite https://abierto.us/opportunities/nctr2025126188.