Siemens 40/40L4B-122SF

UV/IR Flame Detector 4.5U BIT WO1 85C 3/4″ SS FM

Condition: New
Brand: Siemens
Status: Active
SKU: 122212
Manufacturer Part #: 40/40L4B-122SF
Secondary Part #: S54430-F211-A1


The UV-IR High-Speed Flame Detector (Series 40/40L4B) provides a combination of UV and IR sensors in which the IR sensor operates at a wavelength of 2.5-3.0μm, detecting fires, such as: hydrocarbon-based fuel and gas; hydroxyl and hydrogen, and metal and inorganic fires. Series 40/40L4B is identical to the aforesaid UV and IR combination, except the IR sensor works at a wavelength of 4.5 μm, and the IR sensor is only suitable for hydrocarbon-based fires. The UV / IR high-speed flame detectors have considerable durability and weather-related resistance, and includes a Built-In Test (BIT) feature. Specifically, Model 40/40L4B-122SF is comprised of the following: 4-20mA (SINK) wiring; a Normally Closed (N.C) FAULT relay, and Normally Open (N.O) ALARM relay. Model 40/40L4B-122SF has a maximum operating temperature of 185°F (85°C). It is stainless-steel by design, and has a 3/4 inch National Pipe Thread Taper (NPT). This product is Factory Mutual Approved, as well as SIL2 (TUV) Approved to IEC 61508.

Additional information

Weight 6.1 lbs
Dimensions 4.00 × 4.60 × 6.18 in

Siemens Industry, Inc.




Unit of Measurement

EA (Each)

Production Status


Flameproof Strobe Lights; Models 2000 Series XEN1 and XEN4


Siemens - Data Sheet