Honeywell SmartLine STF700

Honeywell SmartLine STF700 Specification

Frequency
Output digital signal: 4-20 mA + HART communication

Voltage
24 VDC (typical, powered by control system)

Control System
Integrates with DCS/PLC, HART, DE (Honeywell Digitally Enhanced Protocol)

Mounting Type
2-inch pipe or wall mounting (bracket optional)

Max Suction
Not applicable (electronic transmitter)

Caliber
Span limits: 0-7 mbar to 0-210 bar (varies by model)

Inlet/Outlet
1/4-18 NPT (process connection)

Speed
Response time: 100 ms (configurable)

Features
Modular design, diagnostics, local display, field configurable, SIL-certified

Flow Rate
Not applicable (pressure measurement device)

Head Size
Not applicable (pressure transmitter)

Noise Level
Digital device, no noise emission

Working Temperature
-40C to +85C (ambient limits)

Theory
Capacitance-based differential pressure measurement

Material
316L Stainless Steel, Hastelloy C-276 (optional)

Structure
Robust aluminum or stainless steel electronics housing

Power
11.4 to 42.4 VDC

Standard
IEC 61508, SIL 2/3, CE, FM, ATEX, CSA, EAC, KC

Pressure
Differential Pressure up to 210 bar (max depending on model)

Usage
Process pressure measurement in industries such as oil & gas, chemical, refining, power, and water treatment

Application
Level, flow, and pressure measurement in process industries

Seals Type
Viton, EPDM, or optional per wetted material compatibility

Priming
Not applicable (self-purging design in transmitter)

Capacity
Ranges from 0-7 mbar up to 0-210 bar (dependent on model)

Ambient Humidity
0-100% RH (non-condensing)

Display
LCD, configurable for process data, diagnostics, and settings

Process Connection Types
Flange or threaded (various sizes available)

Ingress Protection
IP66/IP67, NEMA 4X

Process Wetted Parts
316L Stainless Steel, Hastelloy C, Gold-plated diaphragms (optional)

Operating Altitude
Up to 2000 meters without performance impact

Stability
0.02% per year for 10 years

Configuration
Field configuration using local interface or remotely using HART

Safety Function
Certified for use as a safety device (SIL applications)

Electronics Housing
Aluminum or stainless steel (option)

Zero and Span Adjustment
Local and remote (via HART communicator)

Output Signal
4-20 mA with HART 7.0 digital communication

Turn Down Ratio
100:1 (calibrated span)

Weight
Approximately 3.2 kg (depending on options)

Honeywell SmartLine STF700 Trade Information

Minimum Order Quantity
1 Unit

Delivery Time
2 Week

About Honeywell SmartLine STF700

The ST700 Flange Mount Pressure Transmitters are ideal for critical applications such as natural gas custody transfer and energy and material balances, where accuracy and stability are of utmost importance. Four ranges are available:

STF724/ STF725	-400 to 400 in H2O	-1000 to 1000 mbar
STF732/ STF735	-100 to 100 psi	-7.0 to 7.0 bar
STF72F	-400 to 400 in H2O	-1000 to 1000 mbar
STF73F	-100 to 100 psi	-7.0 to 7.0 bar

Processing & Performance Metrics

Accuracy

Up to 0.05% of span (standard), 0.04% (optional)

Minimum Span

STF724/STF72F: 4 inH2O (10 mbar)
STF732/STF73F: 1 psi (0.07 bar)

Maximum Turndown Ratio

Up to 100:1 (model dependent)

Wiring / Mechanical & Physical Properties

Wiring

Up to 16 AWG (1.5 mm diameter)

Mechanical & Physical Properties

Wetted Materials

316L Stainless Steel, Hastelloy C-276, Monel 400 (model dependent)

Electrical Specifications

Supply Voltage

10.8 to 42.4 VDC (HART), 15 to 49.3 VDC (DE), 9 to 32 VDC (FF)

Pressure Range

LRL: -400 inH2O/-100 psi
Min Span: 4 inH2O/1 psi
STF724/STF72F: 400 inH2O (1000 mbar)
STF732/STF73F: 100 psi (7.0 bar)

Environmental Conditions

Stability

Up to 0.02% of URL per year for 10 years

Relative Humidity

0 to 100% RH

Rangeability

Up to 100:1 (model dependent)

Measurement Type

Flange Mounted Liquid Level

Maximum Allowable Working Pressure (MAWP)

ANSI Class 150: up to 285 psi (19.6 bar)
ANSI Class 300: up to 740 psi (51 bar)
DN PN40: up to 580 psi (40 bar) (varies by material and temp)

Ambient Temperature Limits

-40 to +85 deg C (Ambient); -55 to +120 deg C (Storage)

Functional & Control Features

Sensor Technology

Piezoresistive sensor with static pressure & temperature compensation

Diagnostics

Comprehensive On-board Diagnostics, Critical/Non-critical, SIL 2/3 Certified

Standards & Certifications

Safety Approvals

SIL 2/3 certified, Dual Seal design, NAMUR NE-43 compliance, World class overpressure protection

Approvals

FM, CSA, ATEX, IECEx, NEPSI, KOSHA, EAC, CCoE, UATR, SAEx, INMETRO, Marine (ABS, BV, DNV, KR, LR), IEC 61508 SIL 2/3

I/O Capabilities

Response Time

As fast as 100 ms millisecond

Process Connection Type

1/4 in NPT, 1/2 in NPT (with Adapter), DIN, ANSI/DIN flanges (2, 3, 4 in Class 150/300, DN50/80/100 PN40)

Marine Certification

ABS, BV, DNV, KR, LR

Configuration

External Zero, Span, & Configuration Capability; Two or Three-Button Local Configuration

Communication & Protocols

Output/Communications

4 to 20 mA, Honeywell DE, HART (v7.0)

Overview

Models

STF724/STF725/STF732/STF735/STF72F/STF73F

Software & Interface

Fill Fluids

Silicone Oil 200, CTFE, NEOBEE M-20, Silicone Oil 704

Technical Specifications

Display Options

Modular LCD (Alphanumeric or Advanced Graphics), Multiple Screens, Configurable Units

High Precision and Long-Term Stability

With a turndown ratio of 100:1 and a remarkable long-term stability of 0.02% per year for ten years, the SmartLine STF700 ensures accurate pressure measurement over the transmitter's lifespan. This precision is crucial for maintaining process efficiency and meeting stringent industrial standards.

Enhanced Safety and Ruggedness

The STF700 is certified for use in safety instrumented systems (SIL 2/3) and is built to operate in harsh conditions, featuring IP66/IP67, NEMA 4X ingress protection, and robust materials like 316L stainless steel and Hastelloy C. These features guarantee reliable operation even in challenging environments.

Versatile Communication and Easy Configuration

Offering both local and remote configuration via HART or the local LCD interface, the STF700 adapts seamlessly to various control systems, including DCS and PLC. Its modular electronics, advanced diagnostics, and digital communications support easy integration and maintenance, reducing downtime and operational costs.

FAQ's of Honeywell SmartLine STF700:

Q: How can the Honeywell SmartLine STF700 be configured both locally and remotely?

A: The STF700 can be set up using its local LCD display interface for on-site changes or remotely via a HART communicator connected to your control system. This provides flexibility for both field technicians and central control teams.

Q: What types of process applications is the SmartLine STF700 best suited for?

A: The STF700 is engineered for pressure, level, and flow measurement in process industries like oil & gas, chemical, refining, power, and water treatment. Its accuracy and flexibility make it ideal for critical process monitoring and safety applications.

Q: When should I choose optional wetted materials like Hastelloy C or gold-plated diaphragms?

A: Optional wetted materials such as Hastelloy C or gold-plated diaphragms should be selected when your process media are highly corrosive, or require additional protection against harsh chemicals, ensuring long-term reliability and compatibility.

Q: Where can this transmitter be installed in terms of mounting and environmental conditions?

A: The STF700 is designed for installation on a 2-inch pipe or wall (with optional mounting bracket). It operates reliably in ambient temperatures from -40C to +85C, at altitudes up to 2000 meters, and in environments with 0-100% non-condensing humidity.

Q: What is the process for adjusting zero and span on the STF700?

A: Zero and span can be adjusted locally through the keypad and LCD display or remotely using a HART communicator. This enables precise calibration after installation and during routine maintenance.

Q: How does the STF700 benefit users in terms of diagnostics and system integration?

A: Advanced diagnostics help detect sensor and process issues early, minimizing downtime. The transmitter integrates with common control systems (DCS/PLC) via 4-20 mA and HART or Honeywell DE protocols, simplifying system design and operation.

Q: What are the main benefits of using the STF700 for safety-critical applications?

A: Certified for SIL 2/3 applications, the STF700 provides reliable and accurate process measurement in safety instrumented functions. Its long-term stability, robust construction, and advanced diagnostics support compliance and operational safety standards in critical environments.