Fault
Reason
Does not switch
No power or power too low
on (LED output
(green LED does not light
off)
up)
Emitter defective
Attenuation of the product
too high
Path of rays covered (e.g.
PTFE-diaphragm dirty)
Wrong installation (from
page 16)
Does not switch
Receiver defective
off (LED output
Attenuation of the product
on)
too low
Endress+Hauser
Remedy
Check power at the emitter and
receiver
Replace emitter
Adjust the sensitivity at the
receiver (from page 30)
Clean path of rays
Check installation
Replace receiver
Adjust the sensitivity at the
receiver
en - Troubleshooting
47