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Preferred Instruments

Preferred Instruments manufactures microprocessor based controllers, instruments, and electric actuators for combustion and process applications. Preferred Instruments also manufactures oil tank gauging and leak detection equipment. A major component of the Instrument group sales is from control systems integration and personal computer based Supervisory Control and Data Acquisition systems. Preferred Utilities' industrial factory is located in Danbury, CT

Quanta Flame Series 5002-01NC UV Scanner

The Quanta-Flame Series 5002-01 NC series UV Flame Scanner is intended for monitoring all gas and light oil fired burners. Standard model interfaces with Preferred, Fireye, and Honeywell flame safeguard controllers. -C versions output a contact closure and 4-20 mA signal for interface with PLC and DCS-based flame safeguard systems.


Preferred 5002-NC ultraviolet scanners are applicable to gas and light oil fired burners for boilers and process heat applications. The standard model interfaces with Preferred, Fireye, and Honeywell flame safeguard controllers. -C versions output a contact closure and 4-20 mA signal for interface with PLC and DCS-based flame safeguard systems.


The Quanta-Flame 5002 Flame Scanner is intended for monitoring all gas, oil and coal-fired burners. The control is the basis for industrial or commercial burner management systems using microprocessors, PLC or relay-based hardware. All essential circuits are supervised.

A Flame Status LED and Flame Relay LED provide useful diagnostic information on the front of the scanner.

Flame Status LED: The Flame Status LED (FSL) is a dual color LED that acts as a multi-functional indicator. When a flame is detected the FSL will illuminate with a red color. This light will vary in intensity proportional to the level of flame signal (flame strength) detected.

Flame Relay LED: The Flame Relay LED (FRL) is a single color LED. When a flame of sufficient intensity is detected the 5002 control will activate the output signal. This output may be any one of the possible output forms described above. While the output is activated the FRL will illuminate. Should the flame signal fall below the minimum threshold, or should one of the internal circuits or sensing elements tests fail, the output will deactivate and the FRL will shut off.



  • Interfaces with Preferred, Fireye, Honeywell, and PCI Flame Safeguard Controllers
  • Internal Microcomputer Controls Internal Functions
  • High Quality Fused Silica Quartz Lens
  • Machined Alloy Housing With Seals
  • Status LEDs
  • Output On Indicator


Length Overall: 3.5” (88.9 mm)

Diameter:  2.25” (57.2 mm)

Housing: Machined 5052 Aluminum  Alloy

Finish: Clear

Sight Tube Entrance: 1/2” Pipe Thread


Supply Voltage: 120 VAC 50/60Hz, 24 VDC

Required Power: 2 VA

Output Contact Rating: 230 VAC, 1 amp

Available Outputs: Relay Contact, 4 to 20 mA, Frequency Modulation

Specifications for 4 to 20 mA Output

Span Error:  1%

Non-Linearity: 0.1%

Supply Required To The Loop: 12 to 30 VDC


Class: NEMA 4

Temperature: (0° F to 140° F).


Lens Material: Fused Silica

Spectral Sensitivity

Ultraviolet: 180-230 nanometers

Product Certification

UL File Number: E233069


UV Scanner: Flame scanner shall be U.L. recognized. Scanner housing shall be made of rugged anodized aluminum, have two status LEDs, and connect by means of a military-style quick disconnect fitting.
Physical Desciption: Scanner shall be made of high strength anodized aluminum and mount by means of industry standard 1/2” NPTF connection and include:

  • 3/8” Purge connection
  • 5 Pin military-style quick disconnect cable fitting

Electrical Characteristics: Scanner shall be powered by 120 VAC or 24 VDC input power. A 120/230 VAC relay contact shall prove flame. In addition, a flame intensity signal shall be provided with the following outputs depending on the model:

  1. 4-20 mA
  2. 0 to 10 VDC
  3. Frequency Modulation

Manufacturer: Scanner shall be model 5002-01NC manufactured by Preferred Instruments of Danbury, CT.