10
WIKA Operating Instructions Level Transmitter
– BLM-SF-FM
Electrical connection:
Use a shielded two-wire cable with a cross section of
22…12 AWG. Crimp-on ring or spade terminal is required.
Field wiring must be rated >10K above the equipment ser-
vice temperature of +79°C. For maintaining ingress protec-
tion IP67 the outer diameter of the cable has to be
7…10mm.
After unscrewing the rear housing cover, connect the sup-
ply
wires to the terminals “+” and “-” and GND to the hous-
ing. The sensor has an internal and external grounding
clamp.
= GND (Ground)
Attention
According to local regulations, the devices BLM-SF-FM
have to be connected to the over voltage protection and
the potential equalization!
Attention
The sensor must be operated with a fuse ≤200 mA fast as
short circuit protection. This fuse may be positioned in the
power supply or separately. Fuse design voltage must be
equal or higher than rated voltage of the sensor. Breaking
capacity of the fuse must be 1500 A.
In order to maintain the ingress protection according to the data sheet, a
suitable cable gland must be used and tightened accordingly. Check all
seals for damage and ensure that all sealing faces are clean. No liquid
contamination is allowed in the control and terminal box.
