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ST 3000 Smart Transmitter 
 
Series 900 Remote Diaphragm Seals Models
 
 
 
STR93D 
0 to 100 psid 
0 to 7 bar 
 
STR94G 
   0 to 500 psig 
0 to 35 bar
 
 34-ST-03-57
  
3/07
 
Specification and 
Model Selection 
Guide
 
 
 
In 1983, Honeywell introduced the first 
Smart Pressure Transmitter― the ST 
3000
®
. In 1989, Honeywell launched 
the first all digital, bi-directional protocol 
for smart field devices. Today, its 
ST 3000 Series 900 Remote Seal 
Transmitters continue to bring proven 
“smart” technology to a wide spectrum 
of pressure measurement applications.  
For applications in which the 
transmitter must be mounted remotely 
from the process, Honeywell offers the 
remote seal line of gauge, absolute and 
differential pressure transmitters.
 
Typical applications include level 
measurement in pressurized vessels in 
the chemical and hydrocarbon 
processing industries.  A second 
application is flow measurement for 
slurries and high viscosity fluids in the 
chemical industry. Honeywell remote 
seal transmitters are available with 
secondary fill fluids for corrosive or high 
temperature process fluids 
 
All ST 3000 transmitters can provide a 
4-20 mA output, Honeywell Digitally 
Enhanced (DE) output, HART
*
 
output, 
or F
OUNDATION
 Fieldbus output. 
When digitally integrated with 
Honeywell’s Process Knowledge 
System™, EXPERION PKS™, 
ST 3000 instruments provide a more 
accurate process variable as well as 
advanced diagnostics. 
 
Honeywell’s cost-effective ST 3000 
S900 transmitters lead the industry in 
reliability and stability: 
 
•  Stability = ±0.01% per year 
•  Reliability = 470 years MTBF 
 
 
 
 
 
 
 
Figure 1
—Series 900 Remote Seal Pressure Transmitters feature proven 
piezoresistive sensors and advanced seal technology with standard weld 
connections. 
 
The devices provide comprehensive self-diagnostics to help users 
maintain high uptime, meet regulatory requirements, and attain high 
quality standards. S900 transmitters allow smart performance at 
analog prices.  Accurate, reliable and stable, Series 900 transmitters 
offer greater turndown ratio than conventional transmitters. 
 
"Honeywell transmitters operating in the digital mode using 
Honeywell's Digitally Enhanced (DE) protocol make diagnostics 
available right at the control system's human interface. Equally 
important, transmitter status information is continuously displayed to 
alert the operator immediately of a fault condition.  Because the 
process variable (PV) status transmission precedes the PV value, we 
are guaranteed that a bad PV is not used in a control algorithm.  In 
addition, bi-directional communication provides for remote transmitter 
configuration directly from the human interface, enabling management 
of the complete loop.”   
                                       Maureen Atchison, DuPont 
                                       Site Electrical & Instrumentation Leader 
 
Introduction