Baker Hughes Masoneilan 496 Series Instruction Manual page 17

8.2 Calibration of rotary limit switch
496-.57 and 496-.58 equipped
with proximity switch(es)
8.2.1. Type 496-457 and 496-458
• Actuate the valve to the desired triggering position
and check the sense of rotation when the arm
leaves the proximity sensor.
•
The figure below shows the location of the
proximity sensor and of the arm when triggering
as a function of the sense of rotation.
• Slowly move the arm towards the proximity
sensor until it triggers. Triggering occurs when
the arm overlaps approximately 1/3 of the
proximity switch.
• Strictly follow safety instructions under §7.4
before putting into service.
34
Rep. Designation
33 Arm
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34
33
Rep. Designation
34 Proximity switch
8.2.2. Type 496-557 and 496-558
During adjustment make sure that the proximity
switch with the red spot is triggered by the arm
with the red spot.
• Adjustment of the first proximity switch
– The first switch is adjusted at the beginning of
the stroke.
– Check what will be the sense of rotation when
the valve is actuated. Figure (b, c) below shows
the proximity sensor and the arm assigned to
the first triggering point for a given the sense of
rotation.
– Slowly move the arm towards the proximity
switch
until it triggers.
• Adjustment of the second proximity switch
– The second switch is adjusted at the end of the
actuator stroke.
– Immobilize the first arm previously adjusted
and slowly move the second arm towards the
second proximity sensor until it triggers.
– Make sure the first proximity switch is still
correctly adjusted.
• Strictly follow safety instructions under §7.4
before putting into service.
B
Rep. Designation
A Red spot
Masoneilan 496 Series Position Transmitter ATEX Instruction Manual | 17
a
A
B
b
Rep. Designation
B First triggering point
c