The Humidity Alarm Controller, cataloged under National Stock Number 6685-01-554-2387, is classified within Federal Supply Class 6685 (Pressure, Temperature, and Humidity Measuring and Controlling Instruments) of the Instruments and Laboratory Equipment group. The manufacturer of record is Howell Laboratories Inc Dba Howell Laboratories Inc. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6685-01-554-2387 |
| Primary Part Number | 5219D-G501/LHD8 |
| Item Name | Humidity Alarm Controller |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | Howell Laboratories Inc Dba Howell Laboratories Inc |
| Status | ACTIVE |
| Accessory Components and Quantity | COVER 1, BASE PLATE 1, LIGHT 1, FLASHER 1, CIRCUIT BOARD 1, DIAL POT 1, SENSOR JACK 1, FUSE HOLDER 2, TRANSFORMER 1, TEST SWITCH 1, RECEPTACLE 1, SPACER 4, FUSE 2, STOPNUT 7, LOCKWASHER 6, TERMINAL BOARD 1, NAMETAG 1, RESISTOR 1, HEX NUT 2 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 4870 IT NO.3 P/N-5219D-G501/LHD8 | Howell Laboratories Inc Dba Howell Laboratories Inc (USA) |
| 5219D-G501/LHD8 PRIMARY | Howell Laboratories Inc Dba Howell Laboratories Inc (USA) |
| 5219 REV H / P/N 5219D-G501/LHD8 | Howell Laboratories Inc Dba Howell Laboratories Inc (USA) |
NSN 6685-01-554-2387 is a Humidity Alarm Controller, manufactured by Howell Laboratories Inc Dba Howell Laboratories Inc, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-01-554-2387 has 3 manufacturer part numbers on file: 4870 IT NO.3 P/N-5219D-G501/LHD8 (Howell Laboratories Inc Dba Howell Laboratories Inc), 5219D-G501/LHD8 (Howell Laboratories Inc Dba Howell Laboratories Inc), 5219 REV H / P/N 5219D-G501/LHD8 (Howell Laboratories Inc Dba Howell Laboratories Inc).
Key specifications for 5219D-G501/LHD8: Accessory Components and Quantity: COVER 1, BASE PLATE 1, LIGHT 1, FLASHER 1, CIRCUIT BOARD 1, DIAL POT 1, SENSOR JACK 1, FUSE HOLDER 2, TRANSFORMER 1, TEST SWITCH 1, RECEPTACLE 1, SPACER 4, FUSE 2, STOPNUT 7, LOCKWASHER 6, TERMINAL BOARD 1, NAMETAG 1, RESISTOR 1, HEX NUT 2; Part Name Assigned by Controlling Agency: (INAVY)HUMIDITY ALARM CONTROLLER MODULE; End Item Identification: CONTROL PANEL, LOW PRESSURE AIR. 1 specification is 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.