® 2014 General Electric Company. All rights reserved. Masoneilan 12400 Series Transmitter/Controller Instruction Manual | 23
c. Enter the BASIC SETUP menu to display [COUPLNG:%].
d. Look through the side orifice and verify that the screw (62) coupling end of the beam (54) is loose and that the spring arm
(242) is disengaged from the pin (243). Through the 3/4 ” NPT hole at the bottom of the case, push the flexure (59) from
left to right with your finger to verify it is possible to move the beam (54). The value displayed should vary accordingly. Pin
(72) must rotate freely inside the coupling end of the beam.
e. Look at the mechanism through the lateral orifice, and index the oval hole of the flexure towards the special conical
ended pin (53) by bending the flexure (59) toward the case front (see Figure 15). The value read on the LCD must be
between –5% and +5%.
NOTE: Check there is no oscillation of the weight used to simulate the displacer.
f. While holding the flexure (59) in that position, slightly but firmly tighten the screw (62) using a 2.5 mm Allen wrench.
g. Bias (spring arm function) setting
g1. Index again the flexure (59) on the conical ended pin (53).
g2. Move the spring arm (242) below the pin (243) on the beam. The pin has a groove to position correctly the spring.
Check the spring arm is locating inside the pin groove.
g3. Relax the flexible lamella, check the weight stability and control the value on the LCD is always inside +/-5%.
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