KROHNE H250 M8-M9-M10 EN - Manual (Page 12)

2
DEVICE DESCRIPTION
12
H250
www.krohne.com 04/2011 - 4000269302 MA H250-R02 en
2.2.1 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:
2.2.2 Pointer damping
The pointer system with its magnetic system basically contains pointer damping. An additional
eddy current brake is advantageous for fluctuating or pulsing flows. The eddy current brake
magnets surround the pointer vane 1 without touching it, damping its movement. The result is a
pointer position that is considerably calmer, and no distortion of the measured value. A clamp
screw holds it in place securely. The eddy current brake can be retrofitted without having to
recalibrate and while in operation (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_R02_en_269302_PRT.book Page 12 Tuesday, April 12, 2011 10:17 AM