Pneumatic Transmitters Compact Nullmatic™ Controllers Introduction Description These pneumatic controllers accept an externally generated set-point signal, compare it to a process signal from a pneumatic transmitter, and modulate a final control element to maintain the process at the desired value. Plug-in type connections allow their quick removal from the circuit without breaking pipe connections. These instruments were designed for integral mounting in 3 x 6 indicating stations but may be used elsewhere with a surface mounting manifold. Specifications Reproducibility 0.6% of psig Response Level 0.02% of span Standard Operating Range 3-15 psig for set-point, process and output Maximum Operating Pressure 50 psig for set-point, process and output Supply Pressure Normal: 20 psig Minimum: 3 psig Above maximum output Over-Pressure Protection 100 psig on any connection Control Action Reversible Ambient Temperature Limits -40 to 180°F (-40 to 82°C) Detecting Section Formed diaphragm elements Reset Feedback (Series 502 & 503 only) 8 Integral sealing screw allows either internal or external reset feedback Reset Bypass (Series 502 & 503 only) Integral pneumatic relay provides controller-output cutoff and reset-bypass function, when actuated 8.27 Pneumatic Transmitters Compact Nullmatic™ Controllers Ordering data Model Selection Model Number Reset, Controller Type 2 to 200% proportional band 5 to 500% proportional band 501 501W Series 5011 proportional only (P) Derivative Action Minutes Per Repeat Not Applicable Series 502 with reset-bypass control feature1 proportional plus reset (PI) 502 502F 502W 502FW Not Applicable 0.1 to 50 0.01 to 5 503W 503FW 0.05 to 20 minutes 6:1 derivative gain 0.01 to 5 Series 503 with reset-bypass control feature1,2 503 503F proportional plus reset (PI) 0.1 to 50 Mounting Dimensions Model No. A 501 Series 502 Series 503 except:* 503H 503FH 503WH 503FWH 8-1/6 8-3/16 10-9/16 10-7/8 * with nominal 30:1 derivative gain, 0.05 to 20 minutes derivative action 8 1) Series 501, 502 and 503 have a built-in valve that cuts off the controller output during manual control. Additionally, the built-in valve in Series 502 and 503 opens a bypass around the reset needle valve to eliminate the reset time constant during manual control. 2) These models are also available with a nominal derivative gain of 30:1 (.05 to 20 min.). To specify, add H at the end of the model numbers shown (e.g., 503H, 503FWH, etc.). 8.28