Masoneilan 4700P/E & 4800P/E Positioners Manual | 45
© 2021 Baker Hughes Company. All rights reserved.
4. Disconnect the independent regulated air line and connect the positioner output line to the
actuator. Connect supply pressure and signal to the positioner.
5. Apply low value of instrument signal. (3 psi if 3-15 psi signal range) Unlock zero locknut
(4C) and turnbuckle locknut (107). Adjust zero by turning both the zero nut (4B) and
turnbuckle (106) until the low signal line of the cam is aligned with the positioner case
raised reference line and the travel indicator shows closed position. Refer to Figure 5 on
page 16 and Figure 18 on page 56. Re-tighten both locknuts.
6.
Apply full scale value of instrument signal (i.e. 15 psi) and note position of stroke scale
indicator. If travel is not correct, perform span adjustment. Refer to “Span Adjustment” on
page
37.
7.
Repeat zero and span adjustments per “Zero Adjustment”
and
“Span Adjustment” on
page
37 until travel range is correct. After adjustments are satisfactory, re-tighten the
spring locking screw (8), zero locknut (4C), and turnbuckle locknut (107).
NOTE
Although this procedure is written for 87/88 actuators,
it is, in general, applicable to calibration of any
reciprocating actuator.
Damping Adjustment
The airflow to the actuator may be reduced by turning screw (20) clockwise. This adjustment
may be required for smaller volume actuators if instability is observed. Turn clockwise until
desired stability is obtained.
CAUTION
Screw must never be backed out further than top flush
with housing.
Summary of Contents for Masoneilan 4700P
Page 16: ...2021 Baker Hughes Company All rights reserved 16 Baker Hughes Figure 5 87 88 Actuator...
Page 30: ...2021 Baker Hughes Company All rights reserved 30 Baker Hughes Figure 12 FM Installation...
Page 32: ...2021 Baker Hughes Company All rights reserved 32 Baker Hughes Figure 14 ATEX Installation...
Page 64: ...2021 Baker Hughes Company All rights reserved 64 Baker Hughes NOTES...