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

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7.4. CALIBRATION OF SPECIFIC GRAVITY METER
This adjustment is made at the factory for complete instruments. The specific gravity function [SG METER] is very useful in
performing on site new calibrations, simulations with or without liquid and direct reading of specific gravity of liquids on the
application.
CAUTION:
The Specific Gravity Meter function is factory calibrated at a specific gravity of 1.0 for a complete instrument only if the
displacer volume is lower than 1270 cm
3
and the weight is 1362 g.
For an instrument delivered alone with a torque tube, the Specific Gravity Meter function is factory calibrated at a S.G.
1.0 for a displacer with 907 cm
3
volume and 1362 g weight.
If actual displacer characteristics differ from these values, recalibration is required and is possible only if displacer
volume is lower than 1270 cm
3
and if service specific gravity x displacer volume is lower than 1270.
Reading of the specific gravity of a liquid is possible only when displacer is fully immersed into the liquid and if [SG METER]
function has been previously calibrated.
a.
Into the [ADV SETUP] menu, enter the [SGM CALIB] sub-menu. See Appendix C.
b.
Enter the Specific Gravity of Calibration of the S.G. Meter [SG CALIB] =1.0
c.
L
OW LEVEL
[ZERO]
c1.
Attach a set of weights to the torque arm equivalent to the true displacer weight (i.e. 1362 g for a standard displacer) to
simulate the low level or empty the displacer chamber.
c2.
Enter and validate the [ZERO]: the [LEVEL:%] value indicated on the display must equal 0.0%. If not, restart the procedure
until very close to this value. See Appendix C.
d.
H
IGH LEVEL
[SPAN]
d1.
Attach a set of weights to the torque arm equivalent to the apparent displacer weight in high level position with Specific
Gravity of Calibration [SG CALIB] 1.0 or fill the displacer chamber up to the high level position. Stabilise the displacer (or
weights).
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.
d2.
Enter and validate the [SPAN]: the [LEVEL:%] value indicated on the display must equal 100.0%. If not, restart the
procedure until very close to this value. See Appendix C.
e.
Press the * button when [SAVE] is displayed to validate the [ZERO] and [SPAN] settings.
f.
To check if the specific gravity meter calibration has been correctly done, go to VIEW DATA menu, then [SG METER] to read
values corresponding to low and high references.
Parameter name S.I Units English Units
Displacer weight
g lbs
Displacer volume cm 3 in 3
Fluid specific gravity
Displacer Apparent Weight for REF H=
Displacer Actual Weight - (Displacer Actual Volume X [SG CALIB])
i.e. 1362 – 907 x 1 = 455 g for a standard displacer and water