34-St-03-57 Str9 Spec

ST 3000 Smart Transmitter
Series 900 Remote Diaphragm Seals Models
STR93D STR94G 0 to 100 psid 0 to 500 psig 0 to 7 bar 0 to 35 bar

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Specification and Model Selection Guide

Introduction
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 pressurizedvessels 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 FOUNDATION™ 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 900Remote 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 transmittersoffer 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 processvariable (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

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Description of DiaphragmSeals
Diaphragm seals are traditionally used when a standard pressure transmitter should not be exposed to the process pressure directly. Diaphragm seals typically protect the pressure transmitter from one or more damaging aspects of the process media. Consideration for using a diaphragm seal should be made in the following circumstances. • • • • • • • • • High Process Temperature Process Mediais Viscous or Contains Suspended Solids Process Media is Subject to Solidifying Process Media is Corrosive Process Application Requires Sanitary Connections Process Application Subjects the Measuring Instrument to Hydrogen Permeation Tank Level Applications with Maintenance Intensive Wet Legs Tank Application with Density or Interface Measurements Measuring Instrument Requires Remote MountingThe following diaphragm seals are standard from Honeywell (please call your local salesperson if you do not see the product you need for your application): Figure 2 - Flush Flange Seals can be used with differential, gauge and absolute pressure transmitters and are available with 3” ANSI Class 150, ANSI Class 300 and DIN DN80-PN40 process connections. Flush flange seals can also be provided with...