Description
Foxboro 11DM-BS2-R
Technical Specifications
- Product Type: Analog Differential Pressure Transmitter.
- Output Signal: 4-20 mA DC (2-wire).
- Range: Multiple calibrated ranges available.
- Power Supply: 10.5 to 45 VDC.
Functional Features
- Mechanical Reliability: Minimal electronic components reduce the risk of digital failure.
- Simple Calibration: Adjustable zero and span potentiometers for easy field setup.
- Rugged Construction: Built to withstand harsh industrial environments and vibration.
- Interchangeability: Sensor modules can be swapped without recalibration in many cases.
Application Scenarios
Commonly found in legacy power plants, water treatment facilities, and older chemical processes for measuring filter differential pressure, tank level, and steam flow.
Performance Parameters
- Accuracy: ±0.5% of span (typical for analog transmitters).
- Stability: ±0.5% of upper range limit per year.
- Temperature Effect: Minimal drift over operating temperature range.
Material Composition
The sensor capsule is typically 316 stainless steel. The housing is cast aluminum with a corrosion-resistant paint finish. Internal components use industrial-grade electronic parts rated for extended temperature ranges.
Structural Characteristics
A cylindrical, bullet-nosed housing with a bolted cover. Features external adjustment screws for zero and span, protected by a tamper-resistant cover. Includes a local analog meter option for visual indication.
Working Principle
Applied differential pressure causes a deflection in a capacitive or force-balance sensor element. This deflection is converted into an electrical signal, which is amplified and conditioned to produce a precise 4-20 mA output proportional to the DP.
Installation Requirements
Mount vertically or horizontally as specified. Connect impulse lines securely and check for leaks. Ensure proper electrical shielding for the signal cable. Allow the transmitter to warm up for 15-30 minutes before calibration.
Usage Precautions
- Do not apply overpressure beyond the rated limit.
- Avoid exposing the electronics to excessive moisture or corrosive gases.
- When calibrating, use a precision pressure source and a calibrated multimeter.
