KROHNE BM 26 BASIC_ADVANCED EN - Manual (Page 83)

APPENDIX
9
83
BM 26 BASIC/ADVANCED
www.krohne.com 10/2012 - 4000347004 - HB BM26 Basic/Adv R04 en
9.3 Glossary
A
E
F
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Analog transmitter Analog transmitter Analog transmitter Analog transmitter An optional device that transmits an output given by the position of a
magnetic field along a resistance reed chain. The resistance reed chain is
in a tube attached adjacent to the measuring chamber. Output options
include 4...20 mA, HART, PROFIBUS PA and FOUNDATION™ Fieldbus.
Electromagnetic compatibility Electromagnetic compatibility Electromagnetic compatibility Electromagnetic compatibility Defines how much a device influences or is influenced by other devices that
generate electromagnetic fields during operation. Refer to European
standard EN 61326-1 and EN 61326-2-3 for further details.
Float Float Float Float An air-filled, sealed cylinder that contains magnets. The float stays on the
surface of liquid in the measuring chamber. The magnetic field of the float
operates equipment adjacent to the measuring chamber: this includes the
level indicator column, the optional analog transmitter and optional limit
switches.
Level indicator Level indicator Level indicator Level indicator The level indicator is column of 2-color, rotating flaps (or a floating index, if
this option is available) sealed in a heat-resistant glass tube. An optional
scale show the level in the tank in m + cm, feet + inches or % filled.
Limit switch Limit switch Limit switch Limit switch An optional device with a reed contact that is operated by the magnetic field
of the float. It is attached at one or more points adjacent to the measuring
chamber. It indicates when the level of the liquid is at a reference point.
The switch is bi-stable. The switch stays "open" or "closed" until the float
goes back to its initial position.
Measuring chamber Measuring chamber Measuring chamber Measuring chamber The measuring chamber is a bypass chamber that is attached adjacent to a
tank with contents that must be measured. There are 2 process
connections: 1 at the top and 1 at the bottom of the measuring chamber.
The measuring chamber contains a float. Options include axial or lateral
process connections, vents, drains and support collars
Radar level transmitter Radar level transmitter Radar level transmitter Radar level transmitter An optional device that transmits a high frequency signal whose frequency
increases linearly during the measurement phase (called the frequency
sweep). The signal is emitted, reflected on the measuring surface and
received with a time delay. The frequency difference is processed and the
result is the distance to the surface of the liquid. This data is converted into
an output. For more data, refer to technical documentation for the
OPTIWAVE 7300 C.