Foxboro 43AP Pneumatic Controller Technical Specifications and Selection Guide

Maximum range: 50 and 500 kPa (corresponding to 200 and 2000 inH ₂ O)

Maximum working pressure: 14 MPa (140 bar)

Differential pressure components support zero point lifting or suppression, allowing the measurement lower limit to be set within the range of -50% to 150% of the range, greatly enhancing the range adaptability of differential pressure applications.

2. Temperature measuring element (Filled Thermal Systems)

Adopting a liquid filled thermal expansion temperature measurement system, providing multiple range and accuracy level options:

TA-1A (Class IA): Measurement range -30 to+315 ° C (-200 to+600 ° F), minimum range 25 ° C (40 ° F), maximum range 330 ° C (600 ° F);

TA-2A/2B (Class IIA/IIB): Measurement range -45 to+315 ° C (-50 to+600 ° F), range varies with operating temperature;

TA-3B (Class IIIB): Low to high temperature coverage -195 to+760 ° C (-320 to+1400 ° F), minimum range 70 ° C (120 ° F), maximum range 550 ° C (1000 ° F).

3. Pressure Elements

The selection of pressure components is the most diverse, covering gauge pressure, absolute pressure, and vacuum measurement, with materials including 316 stainless steel K-Monel、 Brass, copper nickel manganese alloy, etc.:

Absolute pressure measurement: PA-CA (316 SS corrugated pipe, 170-240 kPa abs), PA-CC (bronze corrugated pipe, 13-270 kPa abs), PA-MA (316 SS double helix, 140-700 kPa abs);

Spiral/helical spring components: PB-AA (316 SS spiral, 1.4-40 MPa), PB-AM (K-Monel, 1.7-14 MPa), PB-BA (316 SS spiral, 82-1400 kPa), PB-BM (K-Monel, 140-1400 kPa);

Bellows pressure components: PB-CA (316 SS, 35-200 kPa), PB-CC (brass, vacuum~100 kPa and 30-180 kPa);

Diaphragm pressure components: PB-DF (50 mm diaphragm, copper nickel manganese alloy, vacuum~35 kPa and 6-70 kPa), PB-PF (75 mm diaphragm, copper nickel manganese alloy, vacuum~2-6 kPa and 2-10 kPa);

Heavy duty spiral component: PB-GA (316 SS, 0.5-200 MPa), with the rear of the component extending out of the housing and only supporting panel installation (43AP-F).

In addition, 43AP can also be equipped with receiver type bellows components (PC code) for receiving pneumatic signals of 20~100 kPa, 3~15 psi, or 3~27 psi, enabling remote setting or cascade control.

Performance indicators and reference operating conditions

Under reference operating conditions (ambient temperature 24 ± 2 ° C, relative humidity 50 ± 10%, supply pressure 140 ± 1.4 kPa), the core performance indicators of 43AP are as follows:

Indication accuracy: Input to pointer indication error of ≤± 0.5% range (applicable to qualified measuring components);

Repeatability: ≤ 0.2% range;

Dead zone: ≤ 0.1% range;

Environmental temperature impact: Within the normal operating temperature range (-30 ° C to+80 ° C), the control point deviation caused by every 55 ° C change is ≤ 1% of the input range;

Influence of gas supply pressure: Within the normal gas supply range (115~155 kPa), the control point deviation caused by every 7 kPa change is ≤ 0.2% of the input range.

Its output signal standard is 20~100 kPa (3~15 psi or 0.2~1.0 bar), and it can be optionally paired with an output pressure gauge of the corresponding range. The air consumption during normal operation is approximately 0.5 m ³/h (under standard conditions).

Specification for Air Circuit Connection and Interface

The process connection and gas source interface of 43AP are located at the bottom of the shell, and the specific specifications are as follows:

Pressure/vacuum interface:

Range upper limit ≤ 14 MPa: R1/4 or 1/4 NPT internal thread;

Range upper limit 14~70 MPa: R1/2 or 1/2 NPT internal thread;

Range upper limit>70 MPa: 9/16-18 Aminco specific connector.

Gas source and output interface: both are 1/4 NPT internal threads.

Automatic/manual switching and disturbance free switching function

43AP supports multiple automatic/manual switching schemes, among which the Internal Bumpless Automatic Manual Transfer Station is an optional feature with great engineering value. This function is achieved through a dual position switch, balance pressure gauge, and regulator:

C-type scheme (2-position switch+balance meter+regulator): supports disturbance free and balanced switching between automatic and manual control through two-step operation;

D-type scheme (2-position nozzle sealing switch): specially designed for manual control, locking the output pressure during switching.

The above switching stations are all located on the inside of the housing and require door opening operation, effectively avoiding the risk of misoperation. For controllers without internal switching stations, external sub panels (SD-1S/SD-1E/SD-1M or SD-2D/SD-2E/SD-2M) can also be optionally equipped to achieve remote A/M switching.

Interpretation of the Selection Code System

The model code of 43AP adopts a modular structure, and users can select and match each item according to their actual needs. The typical format is as follows:

43AP - [Installation Method] [Control Mode] [Output Signal] [A/M Switching] [Measurement Element Code]

Taking example 43AP-PA12N-P/PB-AA:

43AP: Basic model;

-F: On site installation (pipeline or Yoke bracket);

A1: on-off control;

2: 3-15 psi output signal, 30 psi range pressure gauge;