Product Details
Configured for absolute pressure monitoring in pneumatic control loops, the Foxboro 11AH-BS2 (11AH-BS2 Pneumatic Absolute Pressure Transmitter) provides direct mechanical/pneumatic execution utilizing a force-balance mechanism to convert pressures up to 200 psi into standard pneumatic output signals.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 11AH-BS2 |
| Brand | Foxboro |
| Origin | Standard Industrial Manufacturing |
| Weight | 4.5 kg |
| Dimensions | Standard 11A Series Housing |
| Operating Temp | -40 deg C to +120 deg C |
| Power Consumption | 0.42 m3/h (0.25 cfm) air consumption |
| Measurement Range | 20 to 200 psi (0.14 to 1.4 MPa) |
| Output Signal | 3 to 15 psi pneumatic (20 to 100 kPa) |
4-20 mA HART Loop Protocol and Channel Isolation
Operating within Foxboro process control environments, the pneumatic transmitter executes continuous pressure conversion without requiring electrical power sources, eliminating electromagnetic interference (EMI) susceptibility and ground loop vulnerabilities common in electronic loops. While purely mechanical and pneumatic in operation, the force-balance capsule design maintains high precision and isolation from supply pressure fluctuations. Integrated vernier adjustment mechanisms allow on-line calibration and zero/span trimming without disrupting process continuity or requiring external loop shunt barriers.
Frequently Asked Questions
Q: Does the 11AH-BS2 transmitter require electrical power or a signal conversion barrier?
A: No. The 11AH-BS2 is a purely pneumatic device operating on a clean, dry instrument air supply (nominal 20 psi) and outputs a standard 3-15 psi pneumatic signal.
Q: Can the span and zero calibration be adjusted while the transmitter is online under pressure?
A: Yes, the built-in vernier adjustment allows technicians to perform on-line calibration checks and minor adjustments without interrupting the active pneumatic control loop.
Field Installation Guidelines
- Ensure the instrument air supply is isolated and depressurized before connecting supply lines to the 1/4 inch NPT port.
- Apply thread sealant conforming to plant standards to process connection threads, engaging a minimum of 5 full NPT threads (engagement depth standard).
- Mount the transmitter rigidly to a structural bracket or pipe stand to minimize measurement errors caused by heavy plant vibration.
- Verify that supply air pressure is maintained at the nominal 20 psi level using a clean, filtered, and oil-free instrument air source.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
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