Product Description

The 11AH-BS2 is a high-range pneumatic absolute pressure transmitter from the Foxboro 11A Series. Using a force-balance mechanism, it converts absolute pressures up to 200 psi into a standard pneumatic output signal (3–15 psi), making it ideal for all-pneumatic control loops where electronic sensors are unsuitable.

Constructed with 316 stainless steel, this transmitter offers exceptional corrosion resistance and long-term reliability in harsh industrial environments, including high-vibration and explosion-hazard areas. Its built-in vernier adjustment allows on-line calibration without disrupting the process.

Key Specifications

• Transmitter Type: Pneumatic Absolute Pressure (Force-Balance)

• Model Number: 11AH-BS2

• Measurement Range: 20–200 psi (0.14–1.4 MPa)

• Maximum Input Limit: 350 psi

• Output Signal: 3–15 psi pneumatic (20–100 kPa)

• Accuracy: ±0.5% of span

• Repeatability: 0.1% of span

• Wetted Parts: 316 Stainless Steel (body & capsule)

• Process Connection: 1/2" NPT tapped

• Air Supply Connection: 1/4" NPT tapped

• Supply Pressure: 20 psi nominal

• Air Consumption: 0.42 m³/h (0.25 cfm)

• Operating Temp: -40 °C to +120 °C (-40 °F to +250 °F)

• Weight: 4.5 kg

Applications

• Oil & gas refineries

• Chemical and petrochemical plants

• Paper manufacturing facilities

• Vacuum distillation columns and high-pressure steam monitoring

• Explosion-hazard zones (Class I, Div 1)

• All-pneumatic control loops in high-vibration areas

Technical FAQ

• What does "BS2" mean?

• B: Span 20–200 psi

• S: 316 Stainless Steel wetted parts

• 2: 1/2" NPT process connection

• Does it require electrical power?

• No. The 11AH-BS2 is purely pneumatic and operates with a clean, dry instrument air supply (typically 20 psi).