Honeywell STF73P Flange Mounted Transmitter

Honeywell STF73P Flange Mounted Transmitter

Overview

The Honeywell STF73P is a high-performance flange mounted transmitter designed for demanding liquid level measurement and differential pressure monitoring applications. As part of the SmartLine® ST700 series, the Honeywell STF73P flange mounted transmitter is engineered around advanced piezoresistive sensor technology that combines pressure sensing with on-chip temperature compensation capabilities, providing exceptional accuracy, stability, and performance across a wide range of process conditions-4.

The Honeywell STF73P flange mounted transmitter may be installed directly onto a tank flange and is offered with a variety of tank connections, making it suitable for monitoring, control, and data acquisition in pressurized and unpressurized vessels-1. Typical applications include high-accuracy level measurement in the chemical, petrochemical, and hydrocarbon processing industries, as well as natural gas custody transfer, energy balance monitoring, and material balance tracking-4.

Detailed Technical Specifications

Pressure Range & Turndown: The Honeywell STF73P flange mounted transmitter offers a calibrated span accuracy of up to 0.065% of the calibrated span, with optional accuracy of 0.04% for applications requiring the highest precision-1. The measurement range for the Honeywell STF73P flange mounted transmitter spans from -100 psi to +100 psi, equivalent to -7.0 bar to +7.0 bar-4. The minimum span for the STF73P flange mounted transmitter is 1 psi (0.07 bar), while the maximum span reaches 100 psi (7.0 bar)-5.

Turndown Ratio & Rangeability: The Honeywell STF73P flange mounted transmitter supports turndown ratios up to 100:1, providing exceptional flexibility for applications with fluctuating process conditions-. This rangeability enables a single STF73P flange mounted transmitter to adapt to varying tank levels across a wide operational envelope without requiring transmitter replacement or reconfiguration-1.

Long-Term Stability: The Honeywell STF73P flange mounted transmitter delivers outstanding long-term stability of up to 0.02% of URL per year for up to ten years-15. This exceptional stability ensures consistent measurement performance over extended operational periods, significantly reducing maintenance intervals and recalibration requirements for the STF73P flange mounted transmitter.

Response Time: The Honeywell STF73P flange mounted transmitter achieves response times as fast as 100 milliseconds, enabling real-time process monitoring and control with minimal measurement delay-1-.

Wetted Materials & Process Connections

Wetted Materials: The STF73P flange mounted transmitter features wetted materials including 316L stainless steel as standard, with optional Hastelloy C-276 and Monel 400 available for aggressive or corrosive media compatibility-5-15. The wetted diaphragm is constructed from 316L stainless steel with Hastelloy C-276, Monel 400, or tantalum options available upon request.

Process Connections: The Honeywell STF73P flange mounted transmitter is offered with multiple flange configurations, including flat flange and raised flange options-5. Available flange sizes include 2-inch, 3-inch, and 4-inch ANSI Class 150 or Class 300 connections, as well as DIN DN50-PN40, DN80-PN40, and DN100-PN40 flanges.

Maximum Allowable Working Pressure (MAWP): The Honeywell STF73P flange mounted transmitter has a MAWP of up to 285 psi (19.6 bar) for ANSI Class 150 connections, and up to 740 psi (51 bar) for ANSI Class 300 connections-15. For DIN PN40 connections, the MAWP reaches up to 580 psi (40 bar), varying by material selection and operating temperature.

Electrical Specifications & Communication Protocols

Supply Voltage: The Honeywell STF73P flange mounted transmitter operates on a supply voltage range of 10.8 to 42.4 VDC for HART communication, 15 to 49.3 VDC for DE protocol, and 9 to 32 VDC for Foundation Fieldbus-15.

Communication Options: The STF73P flange mounted transmitter supports multiple communication protocols including 4-20 mA with HART (version 7.0), DE protocol, and Foundation Fieldbus-2. Polarity insensitive electrical connections eliminate wiring orientation concerns during installation-1.

External Configuration: The Honeywell STF73P flange mounted transmitter features external zero, span, and configuration capability, enabling convenient field adjustments without requiring disassembly or specialized tools-1.

Environmental Specifications & Operating Conditions

Temperature Limits: The STF73P flange mounted transmitter withstands ambient temperatures from -40°C to +85°C, with storage temperature range from -55°C to +120°C-15. Automatic temperature compensation ensures measurement accuracy across varying process temperatures without user intervention-1.

Humidity Tolerance: The Honeywell STF73P flange mounted transmitter operates reliably in 0 to 100% relative humidity environments, including condensing conditions-15.

Safety Certifications & Hazardous Area Approvals

The Honeywell STF73P flange mounted transmitter incorporates an integral Dual Seal design based on ANSI/NFPA 70-202 and ANSI/ISA 12.27.0 standards, ensuring safety in critical installations-1. The STF73P flange mounted transmitter is fully compliant with SIL 2/3 requirements as a standard feature, with IEC 61508 certification-15.

Hazardous Area Approvals: The Honeywell STF73P flange mounted transmitter carries comprehensive worldwide certifications including FM, CSA, ATEX, IECEx, NEPSI, KOSHA, EAC, CCoE, UATR, SAEx, INMETRO, and marine certifications (ABS, BV, DNV, KR, LR)-15.

Diagnostic & Integration Features

On-Board Diagnostics: The STF73P flange mounted transmitter incorporates comprehensive on-board diagnostic capabilities for proactive maintenance and fault detection, including both critical and non-critical diagnostic functions-15. The diagnostic system helps maintain uptime, meet regulatory requirements, and achieve high quality standards-2.

System Integration: The Honeywell STF73P flange mounted transmitter is fully tested for compatibility with Experion® PKS, ensuring seamless integration into Honeywell control system architectures-4. The modular design simplifies maintenance and component replacement, reducing downtime and lifecycle costs.

Sensor Technology & Measurement Principle

The Honeywell STF73P flange mounted transmitter features piezoresistive sensor technology that integrates multiple sensors into a single high-performance package, linking process pressure measurement with on-board static pressure and temperature compensation measurements-1-12. This integrated sensor approach allows the STF73P flange mounted transmitter to output fully compensated signals with exceptional accuracy and repeatability.

Display & User Interface

The Honeywell STF73P flange mounted transmitter offers alphanumeric display capabilities with intuitive user interface design-1. The local display provides real-time process variable indication, configuration menus, and diagnostic messages. External push buttons enable on-site configuration, zero adjustment, and span setting without opening the transmitter housing.

Overpressure Protection

The STF73P flange mounted transmitter features world-class overpressure protection, ensuring reliable operation even under abnormal process conditions-5. The overpressure protection system safeguards the sensor against damage from pressure spikes, reducing the risk of unplanned downtime and transmitter replacement.

Model Configurations within STF700 Series

The SmartLine ST700 flange mounted transmitter series includes four primary configurations: STF724/STF725 covering -400 to 400 inH₂O (-1000 to 1000 mbar), STF732/STF735 covering -100 to 100 psi (-7.0 to 7.0 bar), STF72F covering -400 to 400 inH₂O (-1000 to 1000 mbar), and STF73F/STF73P covering -100 to 100 psi (-7.0 to 7.0 bar)-4. Within this family, the STF73P flange mounted transmitter is specifically optimized for 100 psi maximum span applications.

Typical Application Industries

The Honeywell STF73P flange mounted transmitter is deployed across multiple industrial sectors including:

Oil & Gas: Hydrocarbon storage tank level monitoring, natural gas custody transfer-4

Chemical Processing: Pressurized reactor level measurement, solvent storage tanks

Water & Wastewater: Elevated tank level monitoring, pump station control

Pharmaceutical Manufacturing: Sterile vessel level measurement with sanitary flanges

Power Generation: Boiler drum level monitoring, condensate tank measurement

Compliance & Quality Standards

The STF73P flange mounted transmitter meets NAMUR NE-43 compliance requirements for signal levels and fault indication-15. The transmitter is manufactured under ISO 9001 quality management systems and undergoes rigorous factory calibration and testing prior to shipment.

Ordering & Configuration Information

The Honeywell STF73P flange mounted transmitter is available with multiple configuration options including wetted material selection, flange type and size, communication protocol, housing material (aluminum or stainless steel), and hazardous area approval type. Custom configurations and extended lead time requirements should be confirmed with authorized Honeywell distributors.

Extended warranty options are available beyond the standard product warranty, providing flexible procurement solutions for project planning and long-term asset management. Complete STF73P flange mounted transmitter specifications, application engineering support, and customized configurations are available through authorized Honeywell distribution channels.

Maintenance & Lifecycle Considerations

The modular design of the STF73P flange mounted transmitter enables field replacement of electronic modules without removing the transmitter from the process connection-2. This modularity allows users to redefine measurement ranges or replace electronic components without requiring complete transmitter replacement, significantly reducing total cost of ownership over the product lifecycle. The ten-year stability specification minimizes recalibration frequency, reducing maintenance labor costs and process downtime.