Honeywell STF72P Flange Mounted Transmitter

Honeywell STF72P Flange Mounted Transmitter

Overview

The Honeywell STF72P SmartLine® flange mounted transmitter delivers precision liquid level measurement for demanding industrial environments. This high-performance single-flange transmitter is engineered around advanced piezoresistive sensor technology, enabling accurate monitoring, control, and data acquisition across a wide range of process conditions-1. For applications requiring reliable liquid level measurement in atmospheric and pressurized vessels, the STF72P flange mounted transmitter provides exceptional accuracy and long-term stability.

Key Performance Specifications

The Honeywell STF72P offers a calibrated span accuracy of up to 0.065%, making it suitable for critical custody transfer and material balance applications where precision is essential-1. With long-term stability of 0.02% of URL per year, the STF72P ensures consistent measurement performance over extended operational periods without frequent recalibration requirements-2. The transmitter features automatic temperature compensation, which minimizes thermal effects on measurement accuracy across varying process temperatures-1.

Measurement Range & Turndown

The STF72P pressure range spans -400 to 400 inH₂O (-1000 to 1000 mbar), with a minimum span of 4 inH₂O (10 mbar)-2. The device supports turndown ratios up to 100:1, providing exceptional flexibility for applications with fluctuating process conditions-2. This rangeability enables the STF72P to adapt to varying tank levels without requiring transmitter replacement or reconfiguration.

Electrical & Communication Specifications

The Honeywell STF72P operates on a supply voltage of 10.8 to 42.4 VDC for HART communication, 15 to 49.3 VDC for DE protocol, or 9 to 32 VDC for Foundation Fieldbus-2. Response time reaches as fast as 100 milliseconds, enabling real-time process monitoring and control-2. The STF72P flange mounted transmitter incorporates polarity insensitive electrical connections and external zero, span, and configuration capability for convenient field adjustments-1.

Wetted Materials & Process Connections

The STF72P features wetted materials including 316L stainless steel, with optional Hastelloy C-276 and Monel 400 for aggressive media compatibility-2. Process connections include 2-inch, 3-inch, or 4-inch ANSI Class 150 or Class 300 flanges, as well as DIN DN50-PN40, DN80-PN40, or DN100-PN40 flanges-12. Insertion lengths are available in 2 inches (50 mm), 4 inches (100 mm), or 6 inches (150 mm)-12. The mounting flange is available in flat or raised configurations with zinc chromate plated carbon steel, 304 SS, or 316 SS options-12.

Environmental & Safety Approvals

The Honeywell STF72P withstands ambient temperatures from -40°C to +85°C and storage temperatures from -55°C to +120°C, with 0 to 100% relative humidity tolerance-2. Maximum allowable working pressure (MAWP) reaches 285 psi (19.6 bar) for ANSI Class 150 connections and 740 psi (51 bar) for ANSI Class 300-2. The STF72P flange mounted transmitter is fully compliant with SIL 2/3 requirements and features an integral Dual Seal design based on ANSI/NFPA 70-202 and ANSI/ISA 12.27.0 standards-2-1. Approvals include FM, CSA, ATEX, IECEx, NEPSI, KOSHA, EAC, INMETRO, and marine certifications (ABS, BV, DNV, KR, LR)-2.

Diagnostic & Integration Features

The STF72P incorporates comprehensive on-board diagnostic capabilities for proactive maintenance and fault detection-2. The transmitter is fully tested for compatibility with Experion® PKS, ensuring seamless integration into Honeywell control system architectures-12. The modular design simplifies maintenance and component replacement, reducing downtime and lifecycle costs-1.

Typical Applications

Industries requiring the STF72P flange mounted transmitter include oil and gas, chemical processing, hydrocarbon storage, water treatment, and pharmaceutical manufacturing. Typical installations involve pressurized and atmospheric vessels where high-accuracy liquid level measurement is critical for process efficiency and regulatory compliance. Natural gas custody transfer, energy and material balances, and inventory management represent common application scenarios where STF72P performance characteristics deliver operational advantages.