User's Guide ______________________________________________________________________
200 _________________________________________________________________ M210667EN-C
0401-165
Figure 114 Particle Filter Holder
3. The filter material can now be removed. See Figure 115 below.
0401-166
Figure 115 Particle Filter
4. After checking and replacing the filter material, the securing screw
of the particle filter holder has to be tightened and the measurement
head cover has to be mounted and locked carefully.
Optional Heated Weather Protection
Hoods
The LT31 transmitter and receiver can be optionally equipped with
heated weather protection hoods. These heated hoods are automatically