HONEYWELL SPS5785 51198651-100

Description

Product Description

HONEYWELL SPS5785 51198651-100 refers to a Smart Pressure Switch (SPS5785) and its associated Replacement Electronics Module or Complete Assembly (51198651-100). The HONEYWELL SPS5785 is a high-performance, programmable pressure switch designed for critical safety and process protection applications. It combines the functions of a precise pressure transmitter and multiple configurable solid-state switches into a single, intelligent device. The 51198651-100 is the specific spare part number for its internal electronic module or the complete unit. The primary function of the HONEYWELL SPS5785 is to monitor process pressure and provide both a continuous 4-20 mA analog output for monitoring/control and one or more programmable setpoint alarms or trip signals for safety interlocking or shutdown. This dual functionality makes it a key component in Safety Instrumented Systems (SIS) and high-integrity process protection.

Product Parameters / Technical Specifications

• Manufacturer: Honeywell (Sensing and Productivity Solutions / Process Solutions)
• Product Line: Smart Pressure Switch (SPS)
• Model: SPS5785 with module/assembly part number 51198651-100.
• Pressure Ranges: Available in various ranges from vacuum to high pressure (specific to order code).
• Process Connection: Typically 1/2″ NPT or other industrial fittings.
• Wetted Materials: 316L stainless steel standard; optional alloys for corrosive service.
• Outputs:
  • Analog Output: One 4-20 mA output linearly proportional to pressure.
  • Switch Outputs: Two or three independent, programmable solid-state (PNP) or relay outputs. Each can be set to different setpoints (high, low, high-high) with adjustable deadbands.
• Display & Interface: Integral graphic LCD display with push-button navigation for local configuration without external tools.
• Accuracy: High accuracy for both analog output (e.g., ±0.25% FS) and switch repeatability.
• Communications: HART protocol communication standard, allowing for digital configuration, diagnostics, and multivariable data access via a handheld communicator or asset management software.
• Power Supply: Typically 12-30 VDC loop powered (for the 4-20mA loop) or separately powered.
• Safety Certifications: Often suitable for use in SIL 2 rated safety applications per IEC 61508/61511.

Advantages and Key Features

• Integrated Safety & Control: The HONEYWELL SPS5785 eliminates the need for separate pressure transmitters and mechanical switches, reducing installation points, potential leaks, and calibration errors. It provides a single, validated source for both the control signal and the safety trip.
• High Reliability & Repeatability: Solid-state switching offers no moving contacts to wear out or arc, ensuring long-term setpoint stability and eliminating contact bounce that can cause nuisance trips in mechanical switches.
• Advanced Diagnostics & Visibility: The local display shows real-time pressure, switch status, and device health. HART communication enables remote monitoring of diagnostics, which is a significant advantage for the SPS5785 51198651-100 in predictive maintenance programs.
• Easy & Flexible Configuration: Setpoints, deadbands, switch logic (NO/NC), and analog scaling can be easily configured on-site via the display or remotely via HART, providing immense flexibility.
• Improved Safety Integrity: Using a single, highly accurate sensor for both monitoring and protection reduces common cause failure potential compared to separate devices.

Application Cases in Industry

• Compressor & Pump Protection: Monitors lube oil pressure, providing a 4-20mA signal to the DCS and using its switches to trigger low-pressure alarms and shutdown trips to prevent mechanical damage.
• Safety Instrumented Systems (SIS): Used as the primary sensor in SIL 2 loops for overpressure or underpressure protection (PSH/PSL) on vessels, columns, and pipelines in oil & gas and chemical plants.
• Hydraulic Power Unit Control: Provides system pressure feedback and activates alarms or stops the pump if pressure falls outside safe operating windows.
• Filter & Skid Monitoring: Measures differential pressure across filters; the analog signal shows trend, while switches provide instant clogging alarms.

Comparison with Competing Products

Selection Suggestions and Precautions

1. Verify Pressure Range and Materials: Select the HONEYWELL SPS5785 variant with the correct pressure range and wetted materials compatible with your process media. The 51198651-100 assembly must match the original specifications.
2. Define Safety Function Requirements: Clearly define the setpoints, deadbands, and required action (alarm, trip, latching) for each switch output. Configure the SPS5785 logic (NO/NC) to match the safety system’s fail-safe philosophy.
3. Proper Installation & Impulse Lines: Ensure proper mounting to minimize vibration. For gas/vapor service, impulse lines must slope upwards to the transmitter to prevent liquid condensation in the line, which can cause measurement errors.
4. HART Configuration & Calibration: Use a HART communicator or software for initial setup and calibration. Document the configuration parameters. Perform a functional test after installation by simulating pressure changes to verify both analog output and switch actions.
5. Bypass Procedures for Testing: For devices in safety loops, establish and follow proper management of change (MOC) and bypass procedures before performing any functional tests that might trip the process.
6. Sourcing from Instrumentation Specialists: Purchase the SPS5785 and its spare module 51198651-100 from authorized Honeywell process instrumentation distributors. They can provide technical support for selection, configuration, and ensure you receive a genuine, certified product for safety applications.

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