© 2021 Baker Hughes Company. All rights reserved.
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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 opened 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).
Air to Close / Direct Acting Positioner
See Figure 18 (page 56) and Figure 19 (page 58).
1. Apply lower value of instrument signal (i.e. 3 psi if 3-15 psi 4700P/4800P or 4 mA if 4-20
mA 4700E/4800E).
2.
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 opened position. Refer
to Figure 5 on page 16 and Figure 18 on page 56. Re-tighten both locknuts.
3. Apply full scale value of instrument signal (i.e. 15 psi or 20 mA.) and note position of travel
indicator. If travel is not correct, perform span adjustment. Refer to “Span Adjustment” on
page
37.
4.
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).
Air to Close/Reverse Acting Positioner
(4700P/4800P only)
See Figure 18
.
1.
Disconnect air line from positioner to actuator at actuator. Run an independent regulated
air line to the actuator. Slowly apply proper air pressure through the regulator to close the
valve. (Handwheel may be used to open valve instead of regulated air line.) Align the travel
indicator with the closed end of travel scale. Do not overtravel.
2.
Place cam (26) on to cam shaft with selected cam lobe facing forward and low signal line
approximately aligned with positioner case raised reference line. Secure cam to shaft using
washer (27), lockwasher (51) and screw (28).
3. Slowly reduce pressure applied to actuator to zero (If handwheel was used, back if off
fully). Cam will now be at high signal line.
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...
