Foxboro 43AP User Manual

MI 011-476
January 1980
Instruction
A Siebe Group Company
Model 43AP Pneumatic Controller, Style B
Installation and Operation
Model 43AP Controller continuously detects the difference between a process measurement and
its set point, and produces an output air signal that is a function of this difference and the type of
control. The output signal is transmitted to a control valve or other control device. The process
measurement, set point, and output signal are indicated on the controller.

Foxboro 43AP Specifications

General

Brand	Foxboro
Model	43AP
Category	Controller
Language	English

Summary

Principle of Operation

Standard Specifications

Details technical specifications like control types, limits, output signal, air supply, and physical characteristics.

Control Action Mechanisms

Explains the internal workings of proportional, reset, and derivative control actions.

Specific Control Modes

Describes the operation of On-Off and Differential Gap control.

Installation Procedures

Controller Mounting Methods

Covers flush, surface, and pipe mounting techniques for the controller case.

Dimensions and Connection Details

Provides detailed dimensions and port specifications for flush and surface mounting.

Piping and Connection Types

Details air supply, output piping, and pressure connection types.

Mounting with Type 37 Meter

Specific instructions for mounting the controller when equipped with a Type 37 Meter.

Automatic-Manual Transfer

Transfer System Components

Describes the regulator, balance indicator, and transfer switch.

Transfer Operation

Guides on switching between manual and automatic control modes.

Alternative Transfer Switch

Details the 2-position nozzle seal switch for automatic-manual transfer.

Operation and Control Adjustments

Putting Into Operation

Initial setup steps, including control dial setting and latching.

Proportional Control Adjustments

Procedures for tuning Proportional Band for the base controller.

Derivative and Reset Adjustments

Procedures for adjusting Derivative and Reset actions for various controller models.

On-Off and Differential Gap Operation

Specific operational steps for On-Off and Differential Gap controllers.