KROHNE BM 500 EN - Manual (Page 11)

INSTALLATION
3
11
BM 500
www.krohne.com 12/2013 - 4003176301 - MA BM 500 R02 en
3.1 Installation requirements
• Be sure that the measuring rod has the correct depth of immersion when placing your order.
The sensor cannot cannot cannot cannot be shortened subsequently!
• Use only the recommended sleeves or adapters. If other systems are used, no guarantee can
be given for proper functioning or leak-tightness.
• The connection thread must have electrical contact with the metal vessel. If this is not
possible, use a separate grounding cable to meet this condition.
• Do not use Teflon or paper gaskets.
• The tightening torque for the sleeve should be 20...30 Nm.
• If the vessel is electrically non-conductive (e.g. plastic tank), the frame potential can be
established via an additional ground electrode, which is electrically connected to the
connection thread. E.g. a standard LS 7200 without electronics. Consult your local contact for
ordering assistance.
• Make absolutely sure that the measuring rod cannot come into contact with the wall of the
vessel. Also take into consideration the possibility of rod deflection caused by moving
product.
• For distances of less than 100 mm / 3.9" (e.g. when installed in vertical pipe runs) the sensor
rod should be located parallel to the wall, otherwise conditions of non-linearity can occur.
For large distances non-parallelity of the rods can be allowed.
• The level meter measures linearly over the full rod length.
Lower dead zone: Lower dead zone: Lower dead zone: Lower dead zone: approx. 8 mm / 0.3" of the lower end of the measuring rod
Upper dead zone:
Upper dead zone: Upper dead zone: Upper dead zone: approx. 44 mm / 1.73" of the upper end of the measuring rod (at the lower
end of the conical part of the rod)
Figure 3-1: Upper and lower dead zone at measuring rod
1 Upper dead zone: approx. 44 mm / 1.73"
2 Active measuring range
3 Lower dead zone: approx. 8 mm / 0.3" immerged in the liquid