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SD73

Input Pressure Span (see Special Notes below)

4 5 6 8 10

12

16

20 24

Valve Stroke
(inches)

Item No. of Range Spring Series 12395 /- 5% stroke range tolerance

1/4

1212

1012 812 612 512 412 624 524 424

5/16

1812

1212

1012 712 612 512 824 624 524

3/8

1812 1412 1212 1012 712 612 1024 724 624

7/16

2012 1812 1412 1012 812 712 1024 824 724

1/2

2412 2012 1612 1212 1012 812 1224 1024 824

9/16

2812 2012 1812 1412 1012 1012 1424 1024

5/8

3212 2412 2012 1612 1212 1012 1624 1224 1024

3/4

3612 2812 2412 1812 1412 1212

1464 1224

7/8

4412 3612 2812 2012 1812 1412 2024 1624 1424

1

4812 4012 3212 2412 2012 1612 2424 2024 1624

1-1/8

5612 4412 3612 2812 2012 1812

2024

1-1/4

6412 4812 4012 3212 2412 2012 2824 2424 2024

1-1/2

6412 4812 3612 2812 2412 4024 2824 2424

1-5/8

6412 4812 4012 3212 2612 4024 3224

1-3/4

6412 5612 4412 3612 2812 4024 3224 2824

2

6412 4812 4012 3212 4824 4024 3224

2-1/4

6412

5612

4412

3612 4024

2-1/2

6412

4812

4012

4824

4024

2-3/4

6412

4812

4412

4824

4824

3

6412

4812

4824

3-1/2

5612

4

6412

Special Notes:

1) All range springs are identified as Part No. (P/N) 12395-______(# from table)
2) Input pressure span = pressure @ max. input – (minus) pressure @ min input, e.g. @ 3-15 psig range = @ 12

psig span

Spring Selection:

1) Find valve stroke nearest desired valve stroke.
2) Find instrument input pressure span nearest desired instrument input pressure span.
3) Select proper range spring at intersection of valve stroke and instrument input pressure span columns.

Springs purchased with models are quoted as model discounts all others get spare parts pricing.

Notes:

1) The maximum zero pressure for the Model 73N12F is 9 psig when the 12395 series range spring is used.
2) The maximum zero pressure for the Model 73N24F is 15 psig for instrument pressure spans of 16 psi or greater

and 28 psig when used for spans of 12 psi or less.

3) The maximum instrument pressure for the Model 73N-FR is 15 psig for instrument pressure spans of 12 psi or

less and 27 psi for spans of 16 psi or greater.

Figure 2 Range Spring Index

5

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Содержание 73N

Страница 1: ...and larger ports in the fast response positioner greater filling and exhausting capacities result This permits a quicker response to a change in control conditions plus increased speed of valve operation Tapped Exhaust The Model 73N Positioner can be ordered with a tapped exhaust port This feature permits piping of the pilot exhaust to a safe atmosphere on applications where noxious gases are used...

Страница 2: ...tions 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 st...

Страница 3: ...in failure of the positioner The following materials are in contact with supply air Aluminum Brass Stainless Steel Neoprene and Buna N The requirements for a quality air supply can be found in the Instrument Society of America s Quality Standard for Instrument Air ISA S7 3 Basically this standard calls for the following Particle Size Maximum particle size in the air stream should be no larger than...

Страница 4: ...e cases valve shut off or opening may be required at a specific instrument pressure To zero the positioner at this point set the instrument pressure at the specific pressure and turn the zero adjustment screw until the valve reaches the required position A slight change of the instrument pressure should start to move the valve The valve stroke for a given span may also be suppressed or shifted to ...

Страница 5: ...12 3612 4024 2 1 2 6412 4812 4012 4824 4024 2 3 4 6412 4812 4412 4824 4824 3 6412 4812 4824 3 1 2 5612 4 6412 Special Notes 1 All range springs are identified as Part No P N 12395 ______ from table 2 Input pressure span pressure max input minus pressure min input e g 3 15 psig range 12 psig span Spring Selection 1 Find valve stroke nearest desired valve stroke 2 Find instrument input pressure span...

Страница 6: ...plunger 5 Use a non abrasive solvent to clean the plunger 6 Replace the plunger 7 Replace and tighten the retaining nut 8 Replace the top cover DISASSEMBLY Refer to parts list 1 Loosen the six socket head mounting screws holding the positioner to the actuator 2 Remove the positioner 3 Remove the two body screws holding the diaphragm stack assembly to the positioner body located on the underside of...

Страница 7: ...SD73 Figure 4 Schematic Direct Acting Figure 5 Schematic Reverse Acting 7 ...

Страница 8: ...et site see the table has current revisions of technical literature in Portable Document Format for downloading To send an instrument to Siemens for warranty or non warranty service call Repair Service and request a Return Material Authorization RMA IMPORTANT An instrument must be thoroughly cleaned decontaminated to remove any process materials hazardous materials or blood borne pathogens prior t...

Страница 9: ...s c SELLER HEREBY DISCLAIMS ALL OTHER WARRANTIES EXPRESS OR IMPLIED EXCEPT THAT OF TITLE SPECIFICALLY IT DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY FITNESS FOR A PARTICULAR PURPOSE COURSE OF DEALING AND USAGE OF TRADE d Buyer and successors of Buyer are limited to the remedies specified in this article and shall have no others for a nonconformity in the goods Buyer agrees that these remed...

Страница 10: ...ng No 10636PL 3 91 Supersedes 8 88 IMPORTANT Service Parts Kits are available for servicing the instrument Contact Siemens for available kits refer to the Product Support section of this instruction Some parts in this Parts List may not be available for separate purchase 10 ...

Страница 11: ...awing No 10976PL 3 91 Supersedes 5 86 IMPORTANT Service Parts Kits are available for servicing the instrument Contact Siemens for available kits refer to the Product Support section of this instruction Some parts in this Parts List may not be available for separate purchase 11 ...

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