11AH-BS2 Foxboro Pneumatic Transmitter

11AH-BS2 11A Foxboro Series Pneumatic Pressure Transmitters

11AH-BS2 11A Foxboro Series Pneumatic Pressure Transmitters

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Foxboro 11AH-BS2 11A Series Pneumatic Absolute Pressure Transmitter Configured for precise absolute pressure measurement in process loops, the Foxboro 11AH-BS2...

رمز المنتج: 11AH-BS2

Manufacturer: Foxboro
Product No.: 11AH-BS2
Product Type: Pressure Transmitters
Product Origin: USA
Payment:T/T, Western Union
Weight: 4500g
Shipping port: Xiamen
Warranty: 12 months

وصف التقييمات

Foxboro 11AH-BS2 11A Series Pneumatic Absolute Pressure Transmitter

Configured for precise absolute pressure measurement in process loops, the Foxboro 11AH-BS2 (11AH Pneumatic Absolute Pressure Transmitter) provides direct physical/electrical execution. The instrument converts process pressure displacement into a standard 3 to 15 psi (20 to 100 kPa) pneumatic output signal via an internal force-balance mechanism. Featuring a 316 stainless steel capsule material and 1/2 NPT process connection, the hardware operates with an air consumption rate of 0.42 m3/h (0.25 cfm) at standard conditions under a constant 20 psi (140 kPa) regulated air supply.

Suffix Breakdown & Model Matrix

11AH: Base module series designating pneumatic absolute pressure transmitters using force-balance mechanics.
B: Span limits covering 0.14 to 1.4 MPa (20 to 200 psi / 1.4 to 14 bar).
S: Capsule material constructed from 316 stainless steel for chemical resistance.
2: Process connection tapped for 1/2 NPT female conduit fittings.

Hardware Specifications

Parameter	Specification
Model	11AH-BS2
Brand	Foxboro
Origin	China
Weight	4.5 kg (9.9 lbs)
Dimensions	Standard 11A Series enclosure dimensions
Operating Temp	Industrial-grade operating range
Power Consumption	0.42 m3/h (0.25 cfm) air consumption at standard conditions
Product Type	Pneumatic Absolute Pressure Transmitter
Input Signal	0 to 25 PSIA (span limit 20 to 200 PSI, range limit up to 350 PSI)
Output Signal	3 to 15 psi (20 to 100 kPa / 0.2 to 1.0 bar) pneumatic
Supply Pressure	20 psi (140 kPa) clean, dry instrument air
Capsule Material	316 stainless steel
Process Connection	Tapped for 1/2 NPT
Air Connections	Supply and output ports tapped for 1/4 NPT
Mounting	Direct or bracket mount on vertical/horizontal 50 mm (2 in) pipe

Process Control & Field Instrument Architecture

The transmitter integrates directly into legacy process control schemes by converting absolute line pressures into modulated pneumatic signals without electronic component reliance. Analog signal conditioning occurs strictly via mechanical force balancing, eliminating electrical noise and grounding loop issues associated with typical 4-20 mA HART loop protocol wiring or FOUNDATION Fieldbus connectivity. The mechanical capsule assembly provides inherent isolation against process fluid temperature spikes while maintaining zero shift stability. By eliminating electronic cold junction compensation and digital converter latencies, the unit responds continuously to fluid pressure shifts across the full 20 to 200 psi span.

Frequently Asked Questions

Q: What instrument air quality parameters are necessary to maintain proper flapper-nozzle alignment?

A: The supply air line requires dry, oil-free instrument air filtered to prevent orifice clogging and mechanical drift across the internal force-balance mechanism.

Q: How does the mechanical force-balance system isolate the output signal from line vibration?

A: The rigid 316 stainless steel capsule and balanced flexure pivot design damp out high-frequency pipe vibrations before pressure forces reach the nozzle-flapper assembly.

Field Installation Guidelines

Pipe Mounting Stability: Secure the mounting bracket to a nominal 50 mm (2 in) vertical or horizontal pipe, verifying the bracket bolts are torqued down to prevent mechanical flex.
Pneumatic Connection Sealing: Apply PTFE tape strictly to male 1/4 NPT air connection threads, ensuring the first two leading threads remain bare to prevent internal orifice contamination.
Process Line Engagement: Engage process piping into the 1/2 NPT tapped port with a minimum of 5 full turns of thread engagement to guarantee pressure-tight operation.
Air Supply Regulation: Set the main upstream air filter-regulator to supply a steady 20 psi (140 kPa) before bleeding air into the transmitter housing.
Impulse Line Venting: Vent air or process fluid trapped inside the impulse lines prior to locking in atmospheric zero settings on the force bar adjustment screw.

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