PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

3904C-G502Controller,humidity Alarm

Howell Laboratories Inc Dba Howell Laboratories Inc · NSN 6685-01-035-5337 · FSC 6685 · No Item Name Available
Verified by PartsTable
NSN 6685-01-035-5337 — this item is cataloged by the U.S. Government under National Stock Number 6685-01-035-5337. Primary manufacturer part number: 3904C-G502.
Features
  • Controller,humidity Alarm — FSC 6685
  • General Characteristics Item Description: LINE VOLTAGE,115 V,AC,48/63 HZ,DEW POINT RANGE 0 DEG F TO MINUS 60 DEG F,ALARM CONTACTS,SPDT,5 AMP AT 115 V,AC V
  • 5 verified cross-references
  • Primary manufacturer: Howell Laboratories Inc Dba Howell Laboratories Inc
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Controller,humidity Alarm, cataloged under National Stock Number 6685-01-035-5337, is classified within Federal Supply Class 6685 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Howell Laboratories Inc Dba Howell Laboratories Inc. Government technical data includes 1 verified specification, sourced from the Federal Logistics Information System (FLIS). This item has 5 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 11 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Cancelled.

Technical Specifications
ParameterValue
NSN6685-01-035-5337
Primary Part Number3904C-G502
Item NameController,humidity Alarm
FSC / FSG6685 / 66 — No Item Name Available
ManufacturerHowell Laboratories Inc Dba Howell Laboratories Inc
StatusCANCELLED
General Characteristics Item DescriptionLINE VOLTAGE,115 V,AC,48/63 HZ,DEW POINT RANGE 0 DEG F TO MINUS 60 DEG F,ALARM CONTACTS,SPDT,5 AMP AT 115 V,AC V
Lifecycle & Compliance
Acquisition StatusCANCELLED
HAZMATNo
Verified Substitutes 11
1660-00-001-2496 INTERCHANGEABLE
Control Box,electrical-Electroni
5970-00-144-15869607 INTERCHANGEABLE
Insulator,strain
Halsit Holdings Llc Div Halsit Holdings, Llc Dba Abbatron
5950-00-147-147311831 INTERCHANGEABLE
Reactor
Freed Transformer Co
5910-00-668-4752 INTERCHANGEABLE
Capacitor,fixed,electrolytic
5950-00-706-9418 INTERCHANGEABLE
Transformer,radio Frequency
5975-00-878-486597091 INTERCHANGEABLE
Plate,wall,electrical
Mulberry Metal Products Inc
6220-01-152-53391183-1 INTERCHANGEABLE
Housing,light
Uusi, Llc Dba Nartron
4820-01-223-0597 INTERCHANGEABLE
Valve Assembly,manifold
4820-01-463-9355 INTERCHANGEABLE
Valve,regulating,fluid Pressure
5999-01-511-483511831 INTERCHANGEABLE
Mounting Pad,electrical-Electron
Cepeda Associates, Inc. Dba Cepeda Associates Inc
Cross-Reference Index
Part NumberManufacturer
MODEL500SRNG0M60DEGF Panametrics Llc (USA)
3904C-G502 PRIMARY Howell Laboratories Inc Dba Howell Laboratories Inc (USA)
500S Panametrics Llc (USA)
11831 Electro Impulse Laboratory Inc Dba Electro Impulse Inc (USA)
131S-S Panametrics Llc (USA)
Related Parts
1660-00-001-2496INTERCHANGEABLE
CONTROL BOX,ELECTRICAL-ELECTRONI
5970-00-144-1586INTERCHANGEABLE
INSULATOR,STRAIN
9607
5950-00-147-1473INTERCHANGEABLE
REACTOR
11831
5910-00-668-4752INTERCHANGEABLE
CAPACITOR,FIXED,ELECTROLYTIC
5950-00-706-9418INTERCHANGEABLE
TRANSFORMER,RADIO FREQUENCY
5975-00-878-4865INTERCHANGEABLE
PLATE,WALL,ELECTRICAL
97091
6220-01-152-5339INTERCHANGEABLE
HOUSING,LIGHT
1183-1
4820-01-223-0597INTERCHANGEABLE
VALVE ASSEMBLY,MANIFOLD
4820-01-463-9355INTERCHANGEABLE
VALVE,REGULATING,FLUID PRESSURE
5999-01-511-4835INTERCHANGEABLE
MOUNTING PAD,ELECTRICAL-ELECTRON
11831
7310-01-560-0064INTERCHANGEABLE
TANK,FUEL,PORTABLE STOVE
11831

Frequently Asked Questions

What is NSN 6685-01-035-5337?

NSN 6685-01-035-5337 is a Controller,humidity Alarm, manufactured by Howell Laboratories Inc Dba Howell Laboratories Inc, classified under FSC 6685 (No Item Name Available). Status: cancelled.

What are the part numbers for NSN 6685-01-035-5337?

NSN 6685-01-035-5337 has 5 cross-referenced part numbers: MODEL500SRNG0M60DEGF (Panametrics Llc), 3904C-G502 (Howell Laboratories Inc Dba Howell Laboratories Inc), 500S (Panametrics Llc), 11831 (Electro Impulse Laboratory Inc Dba Electro Impulse Inc), 131S-S (Panametrics Llc).

What NSN replaces 6685-01-035-5337?

There are 11 known substitutes for 6685-01-035-5337: 1660-00-001-2496, 5970-00-144-1586, 5950-00-147-1473 and 8 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 3904C-G502?

Key specifications for 3904C-G502: General Characteristics Item Description: LINE VOLTAGE,115 V,AC,48/63 HZ,DEW POINT RANGE 0 DEG F TO MINUS 60 DEG F,ALARM CONTACTS,SPDT,5 AMP AT 115 V,AC V. 1 total characteristics are documented in the Federal Logistics Information System.

Is NSN 6685-01-035-5337 still in active supply?

NSN 6685-01-035-5337 is currently cancelled. Check with the Defense Logistics Agency for current availability and authorized substitutes.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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