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Honeywell MO953 Series Service Data page 6

Pneumatic valve actuators

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SET OPERATING RANGE
Use Wrench 301572A to loosen the cover locking
screw (Fig. 2).
2.
Unscrew the start point adjustment knob until thread
is disengaged. Remove knob.
a. For
psi (21 kPa) range, back all range adjustment
3
screws off to friction stop.
adjustment screws to stop and tighten the outer,
cadmium-plated range adjustment screws.
c. For 10 psi (69 kPa) range, tighten all range
adjustment screws.
RANGE ADJUSTMENT SCREWS
START POINT
ADJUSTMENT
RANGE
ADJUSTMENT
INSTRUCTIONS
SHOWN HERE
Fig. 2. Adjustment Points of M0953/MP953A and B
Gradutrol Relay.
75-5500
replacing the feedback spring with one for the
(see REPAIR).
ADJUST START POINT
E ADJUSTMENT
M IUM PLATED) -
the job drawings. Critical applications and feedback spring
changes mightrequire fine-tuning the
of the start point knob will adjust the start
Change the operating range of MP953E and F by
Reinstall setpoint knob.
Tighten knob by turning it until it is seated on relay
body (Fig.
2).
Loosen knob (maximum of one turn) until start point
of correct scale range lines up with start point
indicator.
Tighten knob locking screw until it engages relay
body. Do not overtighten.
Set the start point on the positioner to the value shown on
range
start
point. Each click
0.25 psi (1.7
point

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