8
WIKA Operating Instructions Level Transmitter
– BLM-SF-FM
Hints for handling inflammable media under pressure:
It must be absolutely guaranteed that when an increase of
pressure occurs, no gas-air mixture is present. On the one
hand, the explosion prevention measures apply only under
atmospheric conditions, on the other hand, with increasing
pressure both the temperature can rise (adiabatic com-
pression) and the ignition temperature becomes dramati-
cally smaller. Therefore, slow pressure increases can al-
ready result in a severe danger of ignition. Further it has to
be noticed, that the indicated temperature class only ap-
plies in combination with the respective ambient tempera-
ture.
Attention:
Operation of the device is allowed only under considera-
tion of the corrosion durability in the environmental condi-
tions.
3.3 Assembly and disassembly
Transmitter types BLM-SF-FM are suitable for use in hazardous locations
Class I, Division I Groups A,B,C,D and Class II, Division I Groups E,F,G.
Explosion proof installations could have flammable vapours and liquids
present. Ensure that the safety information below is followed
Front cover can be removed to allow access to push but-
tons (see section 4.1 for details).
(2mm A/F Key not supplied)
Caution
Ensure that the area is non-hazardous before removing
cover.
Ensure that the cover is tightened and secured with the
lock screw after adjustment.
Turn 180° after first touch with the O-ring.
