Otis Instruments Omniguard Model 660 Flame Detector

Availability: In stock
Operating Temperature Range-40°F to 185°F (-40°C to 85°C) - Standard, -40°F to 257°F (-40°C to 125°C) - Special High Temp. Version
Spectral ResponseUltraviolet Peak Sensitivity of 0.22 um
Nominal Voltage24 VDC (Ripple Voltage <240mV)
Voltage Range20 to 30 VDC
Power Consumption90 mA (Standby), 110 mA (Alarm), 250 mA (Auto and Manual Test)


  • Relays (2): Fire, Trouble, Dry Contacts, Hermetically Sealed
  • Rated: 2 A at 28 VDC (User Selects NO or NC)
  • Fire Relay: User Selects Latching or Non-Latching

Current Loop (Standard Version):

  • 0 to 20 mA Output
  • 20 mA = Fire
  • 0 mA = Ready
Digital OutputProgrammable RS-485 Modbus Serial Output
Product Dimensions4.5 H x 5.5 W x 6 D in.
Total Weight5 Ibs. Aluminum, 13 Ibs. Stainless Steel
Conduit Entry3/4-14 NPTF or M20-1.5
Optional Accessories- Swivel Mount: No. 20856 (Used with Aluminum); No. 70991 (Used with Stainless Steel)
- Portable Test Unit: No. 43808-2
- Air Shield Assy Kit: No. 8001023
Certifications & Approvals- Class I, Division 1, Groups B. C & D (Explosion Proof)
- Class II, Division 1, Groups E, F & G (Dust Ignition Proof)
- NEMA 4X Weatherproof, Dust-Tight, Watertight
- ŒE0081 Ex d II 2 G/D
- Ex d IIB+H2 T5 Gb for Gas on 660-0XXXX
- Ex tb IIIC T100°C Db IP6X for Dust on 660-0XXXX
- Ex d 118+H2 T4 Gb for Gas on 660-1XXXX
- Ex tb IIIC T1 135°C Db IP6X for Dust on 660-1XXXX
- Copper-Free Aluminum Housing Conversion Coated to MIL-C-5541C. Class 3 (White) - Standard


The Omniguard Model 660 UV flame detector is designed to detect unwanted fires and output alarm information. The Model 660 senses ultraviolet radiation in the appropriate wavelength for fast detection of hydrocarbon and non-hydrocarbon fires. Available in two versions: one for standard industrial applications, and one suited for turbine enclosure and high temperature industrial applications.


  • Available in Special High Temperature Version: -40°F to 257°F (-40°C to 125°C)
  • Widest Field View in the Industry of 120°
  • Robust, Weatherproof Enclosure for Indoor or Outdoor Applications
  • Long Range Detection
  • Improved, Advanced, Through-the-Lens Diagnostic Self-Test
  • arountained, Explosion Proof
  • Evailablical No-Test Version
  • State-of-the-Art Microprocessor Control
  • Field Configurable Relays and Sensitivity
  • High Intensity, Localized Indicatic of Fire or Fault
  • FM, CSA, IECE and ATEX Appro
  • All Inclusive 3-Year Warranty on Parts and Labor
Please refer to datasheet for more information
Technical Data-Sheet