Flowserve NT3000 Series - Manual (Page 9)

9
NT 3000 Series Electro-Pneumatic Transducer Module FCD VLAIM0047-00 - 09/04
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Maintenance
Inspection and Replacement
of the Transducer Orifice
To service or replace the NT 3000 transducer orifice, refer to Figures 3
and 8 then proceed as follows:
1. Disconnect air supply pressure to the positioner.
2. Remove the orifice screw (44) from the transducer housing (12).
Examine the O-rings (42, 43) on the orifice screw for wear. Replace
if necessary (see spare parts kits for ordering.)
3. Examine the orifice for blockage. If blocked, the orifice must be
replaced.
4. Tightly replace cleaned or new orifice screw and
O-rings into housing.
5. Reconnect the air supply pressure to the positioner.
Service and Replacement of the
Transducer Filter
The coalescing filter element in the NT 3000 module should be checked
every six months and replaced when necessary. To check or replace
filter, refer to Figure 8 and proceed as follows:
1. Disconnect air supply pressure to the positioner.
2. Remove the filter cover (24) from the housing (45), being careful
not to damage the O-ring (23).
3. Remove the filter element (22) from the housing and examine it; if
plugged or dirty, replace with a new filter.
4. Reinstall the filter after first cleaning the sealing surfaces. Install the
filter in the housing, and tightly fasten on the filter cover.
5. Reconnect the air supply pressure to the positioner.
Service and Replacement of
the Transducer Vent Element
(not applicable for vented model)
To disassemble and reassemble the NT 3000 vent element, refer to
Figure 8 and proceed as follows:
1. Disconnect air supply pressure to the positioner.
2. Remove the two vent cover screws (19) from the housing (45).
Remove the vent cover (20) from the housing.
3. Examine the vent element (21) by unscrewing it from the housing;
if plugged or dirty, replace with a new vent element.
4. Reinstall the vent element. Place a small amount of thread locking
compound on the vent cover screws and tightly secure the vent
element cover.
5. Reconnect the air supply pressure to the positioner.
Figure 6 – NT 3000 Transducer Circuit Board (housing cover removed)
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