Checking the relay output function is accomplished by proof test every 1 year. And
contact welding shall be check by the proof test
The relay contacts must be protected with a fuse rated 0.6 of the nominal specified
relay contact current
Special conditions for SIL 3
- The use of the device is allowed only in a 1oo2 - structure.
- The 4-20 mA output of the device must be monitored regarding deviations.
O: Indicates that said hazardous substance contained in all of the homogeneous
materials for this part is below the limit requirement of GB/T 26572.
X: Indicates that said hazardous substance contained in at least one of the
homogeneous materials used for this part is above the limit requirement of
GB/T 26572.