Overview
The Rosemount 1151DP4S12 is a SMART differential pressure transmitter from Fisher Rosemount’s proven Alphaline series. With over five million transmitters installed worldwide, the 1151 continues to offer industry leading value. This model is configured for differential pressure measurement from -25 to 10 inches of H2O (inH2O), making it suitable for low-pressure HVAC, filter monitoring, and process control applications. Smart, analog and low-power electronics are available to meet specific application requirements.
Key Features
- Smart 4–20 mA dc output, user selectable for linear or square root output
- Smart electronics increased rangeability to 40:1, reducing the number of transmitters to specify, procure and carry in inventory. In addition, ±0.1% accuracy has been achieved through product improvements
- Multiple wetted materials, as well as alternative fill fluids ensure process compatibility
- Modular design allows interchangeable mechanical and electrical components, providing backward and forward compatibility
- Flange-mounted with ¼–18 NPT low-side process connection
- HART protocol compatible (Code S output for SMART models)
Technical Specifications
- Model: 1151DP4S12
- Measurement Type: Differential Pressure
- Pressure Range: -25 to 10 inH2O
- Output: 4–20 mA dc (linear or square root selectable)
- Electronics Type: SMART (Code S)
- Accuracy: ±0.1%
- Operating Temperature (Electronics): –40 to 200 °F (–40 to 85 °C)
- Process Connection (Low-Side): ¼–18 NPT
- High-Side Process Connection: ¼–18 NPT
- Mounting: Flange-mounted (isolation diaphragm)
- Protocol Support: HART (4-20 mA)
- Diaphragm Material: 316 SST (typical)
- Fill Fluid: Silicone oil (standard)
Typical Applications
The Rosemount 1151DP4S12 is commonly deployed in:
- HVAC systems and air handling unit (AHU) filter monitoring
- Differential pressure measurement across heat exchangers and process equipment
- Low-pressure process control loops requiring accurate feedback
- Liquid level measurement via wet-leg DP cell configuration
- Flow measurement applications using restriction orifices or Venturi tubes
Compatibility & Replacements
Compatible With
- PLC and DCS systems supporting 4-20 mA input cards (Allen-Bradley, Siemens, Honeywell, Emerson, etc.)
- HART communicators and asset management systems
- Standard process control loops and instrumentation networks
- Building automation systems (BACnet, Modbus integrations)
- Flow and level instrumentation suites
Replaces / Drop-In Replacement For
- Rosemount 1151DP series differential pressure transmitters with equivalent range codes
- Legacy Fisher and Foxboro differential pressure cells in low-pressure applications
- Verify specific model compatibility with your system integrator before ordering to ensure flange type and port configuration match your process connections
Works With
- 4-20 mA analog input modules on all major PLC brands
- HART protocol host devices and diagnostics software
- Standard pressure transmitter calibration and test equipment
- Process control and asset management software platforms (e.g., AMS, PlantPAx, TIA Portal)
- Industrial pressure measurement instrumentation (gauges, data loggers, recorders)
