Combustible Sensor Information
The BW Flex device can be installed with either a Non-dispersive Infra-red LEL sensor or a
Catalytic type LEL sensors. Furthermore, the catalytic LEL sensors are offered in both filtered
and unfiltered variations. Each type of combustible sensors has standard characteristics and
limitation which the user should be made aware of.
The following information provided is there to:
l Enable you to identify the type of combustible sensor which is installed within your device,
i.e., IR, Catalytic filtered, or unfiltered.
l Provide you with a basic relative response of the IR sensor to other common combustible
gases.
l Provide you with a basic list of detectable gases for both catalytic filtered and unfiltered
sensors.
l Provide a basic of list recommended Correction factors for the Catalytic LEL sensors.
Identifying Combustible Sensor Type
The type of combustible sensor may be determined by the model number printed on the
Certification / serial number label on the rear of the device, as shown in the following example.
The model number should look like "CPD-W6X1H1M1-Y-00," the type of combustible sensor is
identified by the 4th and 5th characters; in this case, "W6".
Use the following table to identify your particular sensor type:
Combustible Sensor option from the model number Sensor Type
W5 NDIR Combustible
W6 Filtered Catalytic Combustible
W7 Un-filtered Catalytic Combustible
Non-Dispersive Infrared (NDIR) sensor Relative Response
The BW Flex NDIR LEL sensor is optimized to see methane. While the unit can detect and
respond to other combustible gases listed in the below table, the readings' accuracy may be in-
consistent. If the primary need is to detect a specific combustible gas other than methane,
please contact Honeywell to discuss an alternative product.
BW Flex Series 49 User Manual
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