Baker Hughes Masoneilan 12400 Series, Instruction Manual & Safety Manual

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® 2017 Baker Hughes, a GE company. All rights reserved. Masoneilan 12400 Series Transmitter/Controller Instruction Manual | 35
7.5. MECHANICAL STOPS SETTING
This procedure consists of setting the mechanical stops (adjusting screws) on the specific gravities of the process. Then, these
adjusting screws are very helpful to perform a dry calibration (without fluid).
The two adjusting screws (114) are located on the sides of the case and are closed by two 1/8” NPT plugs (115). They are adjusted
at factory if the specific gravity meter has been calibrated upon displacer type used.
a.
Open the access plug (107) on the right side of the case to look at the simulation mechanism. Remove plug (190) and the
two 1/8” NPT plugs (115). Use a 5 mm hex wrench.
b.
Through this hole, to define REF L and REF H, use your finger to move the flexure (59) in the direction of the torque tube until
the flexure touches the adjusting screw post (114). While maintaining contact, slide the flexure left or right along the surface
of the screw post (Figure 18).
c.
Perform the two adjusting screws (114) setting by reading the specific gravity value indicated by the specific gravity meter
through VIEW DATA menu and SPECIFIC GRAVITY METER sub-menu.
d.
Enter VIEW DATA menu and SPECIFIC GRAVITY METER sub-menu.
e.
L
OW LEVEL REFERENCE
[ZERO]
e1.
Liquid application :
Press the flexure (59) against the adjusting screw shoulder (114), which corresponds to the low level (opposite side to
the displacer). While maintaining contact and using a 3 mm hex wrench, turn the adjusting screw until LCD displays
the specific gravity value 0.0.
e2.
Interface application:
Press the flexure (59) against the adjusting screw shoulder (114), which corresponds to the lowest specific gravity [LSG
CALIB]. While maintaining contact and using a 3 mm hex wrench, turn the adjusting screw until LCD displays this
specific gravity.
CAUTION:
This procedure is only possible if the [SG METER] function has been calibrated.
Figure18
Setting of adjusting screws
CAUTION:
Specific gravity value refresh requires exiting and entering again the SPECIFIC GRAVITY METER sub-menu.