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SD73
INSTALLATION
Refer to Figure 1 for mounting dimensions and connections. A centering washer (customer provided) which fits the
I.D. of the range spring should be used. This acts as a spring seat and keeps the spring from shifting.
Mounting hardware is included with the positioner in a plastic bag numbered 10448-88. It contains (6) mounting
screws and washers, (1) range spring seat and (1) gasket.
Exceeding the specified ambient temperature limits can adversely affect performance
and may cause the positioner to fail.
1. Place centering washer on the actuator's diaphragm or piston.
2. Place the positioner range spring on the center of the actuator diaphragm or piston.
3. Place the gasket on the mounting flange of the actuator top works. Substitute the P/N 10636-59 centering
diaphragm for the gasket if the P/N 12388-6412 or 12395-6412 range spring is used.
4. Place the positioner range spring seat on the center nut of the positioner diaphragm assembly.
5. Hold the spring seat and guide the positioner and seat onto the range spring.
6. Orient the positioner for desired location of connections.
7. Insert mounting screws and washers and tighten screws.
PNEUMATIC CONNECTIONS
1. All connections are 1/4" NPT.
2. The piping recommended for the positioner is 1/4" O.D. tubing for the INSTRUMENT (input) connection and
3/8" O.D. tubing for the supply connection. However, any scale-free piping may be used.
3. Blow out all piping before connections are made to prevent dirt, chips, etc., from entering the positioner.
4. Use pipe sealant sparingly and then only on the male threads. A non-hardening sealant is strongly
recommended.
5. Connect the positioner to a source of clean, dry, oil-free instrument air supply (see INSTRUMENT AIR
REQUIREMENTS).
Pressure in excess of 150 psig to any connection may cause damage.
INSTRUMENT AIR REQUIREMENTS
Connect the positioner to a source of clean, dry, oil-free supply air. Failure to do so will increase the possibility of a
malfunction or deviation from specified performance.
Use of process fluids other than instrument air is not recommended. No claim is made as to
the suitability of this product for use with other process fluids, such as hazardous gases,
except as listed on the appropriate certificate. Non-approved instruments are suitable for
use with instrument air only. Optional features and modifications such as tapped exhaust do
not imply suitability for use with hazardous gases except as listed on the approval
certificate.
Synthetic compressor lubricants in the air stream at the instrument may cause the positioner
to fail.
CAUTION
CAUTION
CAUTION
CAUTION
2
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