Siemens 73N12F Installation And Service Instructions Manual page 5

4
Valve Stroke
(inches)
1/4 1212
5/16 1812
3/8 1812
7/16 2012
1/2 2412
9/16 2812
5/8 3212
3/4 3612
7/8 4412
1 4812
1-1/8 5612
1-1/4 6412
1-1/2
1-5/8
1-3/4
2
2-1/4
2-1/2
2-3/4
3
3-1/2
4
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.
Input Pressure Span (see Special Notes below)
5 6 8
Item No. of Range Spring Series 12395 Series +/- 5% stroke range tolerance
1012 812 612
1212 1012 712
1412 1212 1012
1812 1412 1012
2012 1612 1212
2012 1812 1412
2412 2012 1612
2812 2412 1812
3612 2812 2012
4012 3212 2412
4412 3612 2812
4812 4012 3212
6412 4812 3612
6412 4812 4012
6412 5612 4412
6412 4812
6412 5612
6412
6412
Figure 2 Range Spring Index
5
10 12 16
512 412 624
612 512 824
712 612 1024
812 712 1024
1012 812 1224
1012 1012 1424
1212 1012 1624
1412 1212
1812 1412 2024
2012 1612 2424
2012 1812
2412 2012 2824
2812 2412 4024
3212 2612 4024
3612 2812 4024
4012 3212 4824
4412 3612
4812 4012
4812 4412
6412 4812
5612
6412
SD73
20 24
524 424
624 524
724 624
824 724
1024 824
1024
1224 1024
1464 1224
1624 1424
2024 1624
2024
2424 2024
2824 2424
3224
3224 2824
4024 3224
4024
4824 4024
4824 4824
4824