The Counter,particle, cataloged under National Stock Number 6635-01-688-1609, is classified within Federal Supply Class 6635 (Physical Properties Testing and Inspection) of the Instruments and Laboratory Equipment group. The manufacturer of record is Tsi Incorporated. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6635-01-688-1609 |
| Primary Part Number | AEROTRAK 9550 |
| Item Name | Counter,particle |
| FSC / FSG | 6635 / 66 — Physical Properties Testing and Inspection |
| Manufacturer | Tsi Incorporated |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 9550-2 | Tsi Incorporated (USA) |
| AEROTRAK 9550 PRIMARY | Tsi Incorporated (USA) |
NSN 6635-01-688-1609 is a Counter,particle, manufactured by Tsi Incorporated, classified under FSC 6635, Physical Properties Testing and Inspection. Status: active.
NSN 6635-01-688-1609 has 2 manufacturer part numbers on file: 9550-2 (Tsi Incorporated), AEROTRAK 9550 (Tsi Incorporated).
Key specifications for AEROTRAK 9550: Special Features: FLOW RATE 1.77CFM 50 L/MIN PARTICLE SIZE RANGE 0.5 TO 25UM; Part Name Assigned by Controlling Agency: PORTABLE PARTICLE COUNTER 9550. 0 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.