The Meter,flow Rate Indicating, cataloged under National Stock Number 6680-01-503-0840, is classified within Federal Supply Class 6680 (Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments) of the Instruments and Laboratory Equipment group. The manufacturer of record is Omega Engineering, Inc.. Government technical data includes 21 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6680-01-503-0840 |
| Primary Part Number | FL-1903 |
| Item Name | Meter,flow Rate Indicating |
| FSC / FSG | 6680 / 66 — Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments |
| Manufacturer | Omega Engineering, Inc. |
| Status | ACTIVE |
| Scale Quantity | 1 |
| Inlet Connection Position for Which Designed | VERTICAL |
| Spinning Float | INCLUDED |
| Design Type | GLASS |
| Integral Pulsation Dampener | INCLUDED |
| Mounting Method | DIRECT LINE |
| Dial Scale Marking Range | +0.5 TO 5.0 |
| Inlet Connection Size | 0.250NPT |
| Inlet Connection Type | THREADED |
| Float Quantity | 1 |
| Alarm Signal | NOT INCLUDED |
| Outlet Connection Size | 0.250NPT |
| Unit Type | MOUNTED |
| Outlet Connection Position for Which Designed | VERTICAL |
| Meter Type | FLOAT |
| Float Type | GUIDED |
| Integral Relief Valve | NOT INCLUDED |
| Material | GLASS FLOAT |
| Integral Heat Source | NOT INCLUDED |
| Dial Scale Reference Pointer | NOT INCLUDED |
| Outlet Connection Type | THREADED |
| 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 |
|---|---|
| FL-1903 PRIMARY | Omega Engineering, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 501-6938929 PC F-1 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 6680-01-503-0840 is a Meter,flow Rate Indicating, manufactured by Omega Engineering, Inc., classified under FSC 6680, Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments. Status: active.
NSN 6680-01-503-0840 has 1 manufacturer part number on file: FL-1903 (Omega Engineering, Inc.).
Key specifications for FL-1903: Scale Quantity: 1; Inlet Connection Position for Which Designed: VERTICAL; Spinning Float: INCLUDED; Design Type: GLASS. 21 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.