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Instruction Manual
D103425X012
Mounting
When a 546NS transducer is ordered as part of a control valve assembly, the factory mounts the transducer on the
actuator and connects the necessary tubing, then adjusts the transducer as specified on the order.
Transducers also can be ordered separately for mounting on a control valve assembly already in service. The
transducer may be ordered with or without mounting parts. Mounting parts include the appropriate bracket and bolts
for attaching the unit to an actuator boss (with tapped holes) or for attaching it to the diaphragm casing. If preferred,
mounting parts are available for mounting the transducer on a 51 mm (2 inch) diameter pipestand, a flat surface, or a
bulkhead. Brackets for seismic mounting capability available upon request.
Tubing is not included if the transducer is not factory mounted. Use 9.5 mm (3/8‐inch) outside diameter tubing for all
supply and output connections. Tubing length between the transducer output and the final control element should be
as short as possible to minimize its effect on control loop stability.
Pressure Connections
WARNING
Severe personal injury or property damage may occur if the instrument air supply is not clean, dry and oil‐free. While use
and regular maintenance of a filter that removes particles larger than 40 micrometers in diameter will suffice in most
applications, check with an Emerson Automation Solutions field office and industry instrument air quality standards for use
with corrosive air or if you are unsure about the proper amount or method of air filtration or filter maintenance.
Note
The supply source must be clean, dry, oil‐free, non‐corrosive air at an unfailing pressure at least 0.3 bar (5 psig) higher than the
upper limit of the transducer output pressure range. This means that for an output pressure range of 0.2 to 1.0 bar (3 to 15 psig)
the supply pressure should be at least 1.4 bar (20 psig); for a 0.4 to 2.0 bar (6 to 30 psig) range, the supply pressure should be at
least 2.4 bar (35 psig). The supply pressure to the filter regulator should not be more than 17.3 bar (250 psig) at a maximum
temperature of 66_C (150_F).
If specified, the filter regulator is mounted on the transducer case. A pressure gauge on the regulator shows the supply
pressure to the transducer.
1. Connect a supply pressure source to the 1/4 NPT IN connection on the filter regulator (if furnished) or to the 1/4
NPT SUPPLY connection on the transducer case (if a regulator is not furnished).
2. Run 9.5 mm (3/8‐inch) outside diameter tubing from the 1/4 NPT OUTPUT connection on the transducer case to
the input connection on the pneumatic actuator or valve positioner. This connection is made at the factory if the
unit is shipped mounted on an actuator as shown in figure 1.
Diagnostic Connections
To support diagnostic testing of valve/actuator/positioner packages, special connectors and hardware are available.
Typical connector installations are shown in figure 2. The hardware used includes a 1/4 NPT pipe nipple and pipe tee
with a 1/8 NPT pipe bushing for the connector. The connector consists of 1/8 NPT body and body protector.
Note
If the transducer is used in a valve assembly with a positioner, no connections for diagnostic testing are required for the
transducer. Install the connections for diagnostic testing at the positioner.
546NS Transducer
June 2021
7
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