KROHNE BM 26 BASIC_ADVANCED EN - Manual (Page 40)

6
OPERATION
40
BM 26 BASIC/ADVANCED
www.krohne.com 10/2012 - 4000347004 - HB BM26 Basic/Adv R04 en
Limit switch
The limit switch is in high-
high (maximum) position and
set to HIGH limit HIGH limit HIGH limit HIGH limit. Status
OPEN OPEN OPEN OPEN.
Overfill? The level of the liquid is at
or above the maximum limit (if the
indicator is configured for level
indication).
Lower the level of liquid below the
maximum limit.
The limit switch is in low-low
(minimum) position and set to
LOW limit LOW limit LOW limit LOW limit. Status OPEN OPEN OPEN OPEN.
Tank empty? The level of the liquid
is at or below the minimum limit (if
the indicator is configured for level
indication).
Increase the level of liquid until it is
above the minimum limit.
The limit switch is in the float
failure position and set to
LOW limit LOW limit LOW limit LOW limit. Status OPEN OPEN OPEN OPEN.
Float failure. The float has sunk to
the bottom of the measuring
chamber.
It is necessary to replace the float.
Order a new float from your local
sales office. Isolate the measuring
chamber and drain the liquid.
Remove the bottom plate flange
and the float. If your device is a
basic version, you will only be able
to remove the float if it has the
1¼ NPT connection at the bottom
of the measuring chamber.
The level switch does not
detect the minimum limit
correctly.
The limit switch (set to LOW limit LOW limit LOW limit LOW limit)
is open (off), but the level of the
liquid is still above the minimum
limit. The density of the liquid is
lower than the value given in the
customer order data.
Make sure that the density of the
liquid is stable. Recalculate the
liquid density and repeat the
installation procedure for the limit
switch.
The limit switch (set to LOW limit LOW limit LOW limit LOW limit)
is not yet open (off), but the level of
the liquid is at or below the
minimum limit. The density of the
liquid is higher than the value given
in the customer order data.
The level switch does not
detect the maximum limit
correctly.
The level of the liquid is at or above
the maximum level, but the limit
switch (set to HIGH limit HIGH limit HIGH limit HIGH limit) is not yet
open (off). The density of the liquid
is lower than the value given in the
customer order data.
The level of the liquid is below the
maximum level, but the limit
switch (set to HIGH limit HIGH limit HIGH limit HIGH limit) is open
(off). The density of the liquid is
higher than the value given in the
customer order data.
Error Description Corrective action