The Thermostat,flow Control, cataloged under National Stock Number 6685-01-439-4890, is classified within Federal Supply Class 6685 (Pressure, Temperature, and Humidity Measuring and Controlling Instruments) of the Instruments and Laboratory Equipment group. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6685-01-439-4890 |
| Item Name | Thermostat,flow Control |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| TMC/TMD | 5/9 Secondary reference Lightstat Inc. |
| TME/AVEU | 3/9 Design control — primary reference Lightstat Inc. |
| TME | 5/9 Secondary reference Lightstat Inc. |
NSN 6685-01-439-4890 is a Thermostat,flow Control, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
Key specifications for 6685-01-439-4890: Special Features: 24-30 VAC;2 STAGE,HEAT/COOL WITH AUTO CHANGE OVER;TEMP.: HEAT RISES TO 60 DEG F. AND COOLING RESET TO 85 DEG F.;MODEL TMD NEW FEATURES HAVE BEEN ADDED TO THE TMC LINE OF LIGHTSTATS FOR IMPROVED PERFORMANCE AND ADDITIONAL ENERGY REDUCTION. VAC. 0 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). 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.