In order for the photoelectric sensor to work reliably, it should be set to -20°C~70°C degrees Celsius. It's important that 9V~30V is applied to the circuit or system for these components to work.
MLSE-0400A2NP0 Features
Operating Temperature: -20°C~70°C MLS Series
MLSE-0400A2NP0 Applications
There are a lot of SICK, Inc. MLSE-0400A2NP0 Photoelectric Sensors applications.