KROHNE H250 M40 EN - Manual (Page 14)

2
DEVICE DESCRIPTION
14
H250 M40
www.krohne.com 11/2012 - 4000640702 MA H250 M40 R02 en
2.2.2 Float damping
Float damping is characterised by high standstill times and self-centering. The damping sleeve
is made of high performance ceramic or PEEK, depending on the medium and the application.
Float damping can also be retrofitted for the user (see Service).
Use of damping
• Generally when CIV and DIV floats are used for gas measurement.
• For TIV floats (H250/RR and H250/HC only) with an operating primary pressure:
2.2.3 Pointer damping
In principle, the indicating element with its magnetic system contains indicator damping. An
additional eddy current brake is advantageous in the event of fluctuating or pulsing flows. The
magnets on the eddy current brake surround the pointer vane without touching it, damping its
movement. The result is a much steadier pointer position, without distorting the measured
value. A turnbuckle ensures a proper fit. The eddy current brake can be retrofitted during
operation without recalibrating (see Service).
Nominal size acc. to Operating primary pressure
EN 1092-1 ASME B16.5 [bar] [psig]
DN 50 ½ " ≤0.3 ≤4.4
DN25 1" ≤0.3 ≤4.4
DN50 2" ≤0.2 ≤2.9
DN80 3" ≤0.2 ≤2.9
DN 100 4" ≤0.2 ≤2.9
1 Eddy current brake
2 Pointer vane
3 Bracket
4 Pointer cylinder
MA_H250_M40_R02_en_640702_PRT.book Page 14 Wednesday, November 28, 2012 12:23 PM