Repeat the zero and span adjustments iteratively until both endpoints are accurate.

Let us apply what we have learned. With the open to page 18 (Calibration Procedure), follow this simplified process:

Because of their rugged build, some reports highlight the "reclaiming" of 3560 units, where old bodies are rehabilitated and lapped to replace even older or less reliable positioner models.

Open your browser and search for: Emerson Fisher 3560 Instruction Manual D103157X012 . Download it now, save it to your mobile device, and keep a laminated copy in your control room. It will be the best five minutes of your work week.

The Fisher 3560 pneumatic valve positioner is a durable instrument used in industrial process control. It adjusts a control valve's position to match a pneumatic input signal from a controller.

A purely pneumatic positioner utilizing a 3 to 15 psi (0.2 to 1.0 bar) or 6 to 30 psi (0.4 to 2.0 bar) input signal.

Calibrated pneumatic signal generator (0–30 psi) or current source (4–20 mA). Two calibrated pressure gauges (0–100 psi range). Standard open-end wrenches and a flat-head screwdriver. Zero and Span Adjustment Procedure

Connect to the actuator diaphragm casing or cylinder.