In 1983, Honeywell were the first to market ‘smart’ pressure transmitters using microprocessor technology. Over the years the measuring principle, a 3-in-1 piezoresistive sensor with internal temperature compensation, has been developed to perfection and is unprecedented accurate and stable. The successful ST3000 range, with the series 100 and 900, is succeeded by the SmartLine pressure transmitters. The transmitters with process flanges for level measurement are available in three series:

Series

STF800 SmartLine: High-Performance pressure transmitter, advanced options
STF700 SmartLine: The standard pressure transmitter for the process industry
STF700 Basic SmartLine: Economic pressure transmitter, OEM and projects

Each series has models with an underlying membrane (pseudo flange model), a membrane plane with the flange (flush flange) and front diaphragm (extended flange), which meets the inside of the tank wall and may prevent obstructions of the nozzle.

Instrumentation

STF800 Flanged pressure transmitters

• STF828 – Flush or extended flange
• STF82F – Pseudo flange
  •  Measuring range 0-1000 mbar
• STF832 – Flush or extended flange
• STF83F – Pseudo flange
  • Measuring range 0-1000 mbar

Specifications for all STF800 models:
2-wire connection, 4-20mA + HART/DE/Foundation Fieldbus
Aluminium housing with polyester coating or 316 SS
Advanced Graphic Display
Standard accuracy 0.05%, optional up to 0.025%
Stability 0.01% per year, turndown ratio 100:1
Recommended calibration period: every 4 years
Certifications: SIL2/3/ATEX/IECEX/FM/CSA/Inmetro/CU-TR/Marine (DNV/ABS/BV/KR/LR)

Downloads
Spec sheet:
STF800-Specsheet

STF700 Flanged pressure transmitters

• STF724 – Flush or extended flange
• STF72F – Pseudo flange
  • Measuring range 0-1000 mbar
• STF732 – Flush or extended flange
• STF73F – Pseudo flange
  • Measuring range 0-1000 mbar

Specifications for all STF700 models:
2-wire connection, 4-20mA + HART/DE/Foundation Fieldbus
Aluminium housing with polyester coating or 316 SS
Display with 2 lines
Standard accuracy 0.05%
Stability 0.02% per year, turndown ratio 100:1
Recommended calibration Period: every 2 years
Certifications: SIL2/3/ATEX/IECEX/FM/CSA/Inmetro/CU-TR/Marine (DNV/ABS/BV/KR/LR)

Downloads
Spec sheet:
STF700-Specsheet

STF700 Basic Flanged pressure transmitters

• STF725-Flush or extended flange
• STF72P-Pseudo Flange
  • Measuring range 0-1000 mbar
• STF735-Flush or extended flange
• STF73P-Pseudo Flange
  • Measuring range 0-1000 mbar

Specifications for all STF700 Basic models:
2-wire connection, 4-20mA + HART 7
Aluminium housing with polyester coating or 316 SS
Display with 2 lines
Standard accuracy 0.065%
Stability 0.025% per year, turndown ratio 100:1
Recommended calibration period: every 2 years
Certifications: SIL2/3/ATEX/IECEX/FM/CSA/Inmetro/CU-TR

Downloads
Spec sheet:
STF725 LE-Specsheet