Valve Positioners Series 73 Built-In Valve Positioner Technical data Spring Table Instrument Input Pressure Span (PSI) 4 5 Valve Stroke Inches 3 6 8 10 12 16 20 24 - Item No. of Range Spring Series 12395 Series ±5% Stroke Range Tolerance Example: 12395-1212 1/4 1212 1012 812 612 512 412 5/16 1612 1212 1012 712 612 512 3/8 1812 1412 1212 1012 712 612 7/16 2012 1812 1412 1012 812 712 1/2 2412 2012 1612 1212 1012 812 9/16 2812 2012 1812 1412 1012 1012 5/8 3212 2412 2012 1612 1212 1012 3/4 3612 2812 2412 1812 1412 1212 7/8 4412 3612 2812 2012 1812 1412 1 4812 4012 3212 2412 2012 1612 1-1/8 5612 4412 3612 2812 2012 1812 1-1/4 6412 4812 4012 3212 2412 2012 1-1/2 6412* 4812 3612 2812 2412 1-5/8 6412* 4812 4012 3212 2612 1-3/4 6412* 5612 4412 3612 2812 4812 4012 3212 2-1/4 2 6412* 5612 4412 3612 2-1/2 6412* 4812 4012 2-3/4 6412* 4812 4412 6412* 4812 3 3-1/2 5612 4 6412* 1) The maximum zero pressure for Model 73N12F is 9 psig when the 12395 series range spring is used. 2) The maximum zero pressure for 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. Consult Factory 3) The maximum instrument pressure for 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. Mounting Dimensions Spring Selection 1. Find the valve stroke nearest the desired valve stroke. 2. Find the instrument input pressure span nearest the desired instrument input pressure span. 3. Select the proper range spring at the intersection of the valve stroke and the instrument input pressure span columns. 3.8