Installation – KROHNE BM 26 BASIC_ADVANCED EN User Manual
Page 24
3
INSTALLATION
24
BM 26 BASIC/ADVANCED
www.krohne.com
10/2012 - 4000347004 - HB BM26 Basic/Adv R04 en
Equipment needed:
• Large slotted tip screwdriver (not supplied)
Installation procedure
• Use the clamp to attach the limit switch to the measuring chamber. Do not tighten the clamp.
i
The cable gland must be at the bottom of the housing.
• Move the limit switch until the switching point centreline is at the level required. Refer to the
level indicator scale to help you position the limit switch.
i
If the indicator column does not have the scale option, it will be necessary to calculate the
vertical offset of the float magnet in relation to the level of the liquid (depends on the liquid
density). Adjust the switch position for the float magnet offset. For the vertical offset tables,
refer to the appendix in the Handbook.
• Adjust the switch position for the switching point offset.
i
If the limit switch is set to LOW limit
LOW limit
LOW limit
LOW limit (the switch is open
open
open
open when the float is below the
switching point), move the switch up a small distance to adjust for the offset. If the limit
switch is set to HIGH limit
HIGH limit
HIGH limit
HIGH limit (the switch is open
open
open
open when the float is above the switching point),
move the switch down a small distance to adjust for the offset. For more data, refer to
Definition of switching point offset
Definition of switching point offset
Definition of switching point offset
Definition of switching point offset and Switching point offset values
Switching point offset values
Switching point offset values
Switching point offset values.
• Tighten the limit switch clamp.
Figure 3-10: How to attach a limit switch
1 Limit switch
2 Switching point centreline
3 Level indicator and optional measuring scale
4 Limit switch clamp
WARNING!
Make sure the cable gland is on the bottom the housing and is tight to stop liquid entering the
housing.
INFORMATION!
Liquid level offset
Liquid level offset
Liquid level offset
Liquid level offset
For a description of the liquid level offset, refer to Liquid level offset: description on page 79
. For
the graphs and other correction data, refer to
Liquid level offset: correction data on page 80
.