UV/IR/Vis Industrial Flame Detector 3100

Sierra Monitor’s 3100 Series flame detector monitors for hydrocarbon or non-hydrocarbon based industrial flames indoors or outdoors.

UV/IR/Vis Industrial Flame Detector 3100

The 3100 Series flame detector utilizes a tri-spectra design (ultraviolet, infrared, and visible light spectrums) to provide continuous and reliable flame detection. Flame detectors incorporating just infrared or UV can experience false alarms from external sources not related to fire. With the tri-spectra design, the 3100 provides enhanced false alarm rejection.

The 3100 Series’ tri-spectra design provides the ability to detect flames from both hydrocarbon and non-hydrocarbon sources, making it the ideal product for a typical chemical/petrochemical plant where the flame source could be generated from a variety of gases. In addition, the 3100 is the only flame detector model that provides RS-232 access to pre-fire spectral data and diagnostic information. Self-diagnostic features of the microprocessor continuously perform system tests, watching for any faults which would impair its ability to accurately detect a flame and declare an alarm. All faults are recorded in non-volatile memory and may be retrieved at any time by an operator.

The UV/IR/Vis Industrial Flame Detector 3100 is approved and certified by a variety of third party agencies, including FM and CSFM. These approvals and certifications assure our customers that we carry only the highest quality of products and performance.

UV/IR/Vis Industrial Flame Detector
1. Self-Diagnostics

Continuously perform system tests to watch for any faults

2. 120-Degree Solid Cone Field of View

Scan across a facility with a wide scope and reduce the need for additional flame detectors

3. State-of-the-Art Fire Algorithms

Analyze data from the system array for individual intensity values, change of intensity values, relationship of intensity values, and frequency signature correlation

4. Tri-Spectra Design

Detect both hydrocarbon and non-hydrocarbon flames and reject false alarms

5. Through-The Lens Test

Continuous test performed to validate a clean lens for proper function

6. Microprocessor Decision-Making

Store pre-fire spectral data in non-volatile memory and outputs an alarm signal in the form of a relay transition

7. Enhanced Relay Models

Include a second alarm relay for alarm verification purposes (optional)


1 sq. ft. pan fire on axis ~ 80 feet within 5 seconds(using standard fuel)

Switch selectable from 20 to 80 feet to a sq. ft. kerosene fire

Field of View

120 degree cone


UV – 180 to 260 nm

IR – 0.715 to 3.5 microns

Visible – 480 to 560 nm

Input Voltage

15 to 32 volts, typically 24 volts

Current Draw

@ 24 volts DC: 72 mA normal mode, 82 mA alarm mode

Temperature Range

Operating: -40oF to 185oF (-40oC to 85oC)


Storage: -67oF to 230oF (-55oC to 110oC)



Display switch settings, fault type, fire and verified fire information


Model 3100-01: Fire and Fault Relays

  • Fire Relay: 0.5 amp ~ 120 VAC, 1.0 amp @ 24 VDC resistive, normally open and normally closed contacts, latching or fire-following nodes
  • Fault Relay: 0.5 amp ~ 120 VAC, 1.0 amp ~ 24 VDC resistive, normally open, common and normally closed contacts

Enhanced Relay Models: Fire, Fault Verify and Aux Relays

  • Verify Relay: 0.5 amp ~ 120 VAC, 1.0 amp ~ 24 VDC resistive, normally open and normally closed contacts are available. May be operated in either a latching or fire following mode.
  • Aux Relay: 0.5 amp ~ 120 VAC, 1.0 amp ~ 24 VDC resistive, normally open and normally closed contacts are available. Normally used to indicate a Lens Check Fault.

Copper-free cast aluminum with epoxy finish

Hazardous Area Classification

NEMA 4X Enclosure rating, Explosion Proof

Class 1, Div. 1 and 2, Groups B, C, D, Class II, Div. 1 and 2, Groups E, F, G, Class III


5.4 x 4.8 x 3.7 inches (13.7 x 12.2 x 9.4 cm)


3 lb. (1.3 Kg)


FM Approved

CSFM: 7210-1608:100

PDO Approval: Petroleum Development Oman Certificate of Registration

ISO 9001:2008: Registered Quality System

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