Baker Hughes Masoneilan 12400 Series, Инструкция по эксплуатации и руководство по безопасности

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® 2017 Baker Hughes, a GE company. All rights reserved. Masoneilan 12400 Series Transmitter/Controller Instruction Manual | 29
7.3.2. C
ALIBRATION AT WORKSHOP WITH WEIGHTS
a.
From [BAS SETUP] menu, enter the [CALIB Z S] sub-menu.
b.
Enter specific gravity of calibration in level application [SG CALIB] or the low and high specific gravities in interface application
[LSG CALIB] and [HSG CALIB].
Actual volume and weight of the displacer can be read using HART communication (if data have been previously saved into
the 12400 instrument memory). Otherwise actual volume of the displacer is marked on the firm plate and displacer weight can
be measured by weighting of it.
c.
Low Level [ZERO]
c1.
Liquid application :
Attach to the torque arm a set of weights equivalent to the true displacer weight (i.e. 1362 g for a standard displacer) to
simulate the low level.
c2.
Interface application:
Attach to the torque arm a set of weights equivalent to the displacer weight completely immersed in the liquid of Lower
Specific Gravity used for calibration [LSG CALIB] using the following formula:
c3.
Enter and validate the [ZERO]: the [LEVEL:%] value indicated on the display must equal to 0.0%. If not, restart the
procedure until very close to this value. See Appendix B.
Standard displacer characteristics S.I Units English Units
Displacer weight
1362 g 3 lbs
Displacer volume 907 cm 3 55.34 in 3
Fluid specific gravity
CAUTION:
During the dry calibration without mechanism chamber, DO NOT ATTACH SPECIAL INTERFACE DISPLACER
(OR ITS EQUIVALENT EFFECTIVE WEIGHT) on the torque arm. Indeed, these displacers being heavier than
those for liquid level service and no mechanical stop being available without of mechanism chamber, the
torque tube and/or the instrument mechanism would be damaged.
Displacer Apparent Weight for REF B =
Displacer Actual Weight - (Displacer Actual Volume X [LSG CALIB])