Key Benefits and Advantages
Unrivaled Digital Accuracy: The STT850 provides a digital accuracy of up to 0.1°C for RTD sensors. This precision is further enhanced by a sensor matching facility, which allows the transmitter to be calibrated to the specific constants of an individual RTD (Callendar-Van Dusen), eliminating the inherent error of the sensor itself.
Unmatched Long-Term Stability: One of the most significant advantages of the STT850 is its stability—up to 0.01% of the Upper Range Limit (URL) per year. Honeywell stands behind this reliability with an industry-leading 15-year lifetime warranty, significantly reducing the frequency of manual calibrations and lowering the total cost of ownership.
Rapid Process Response: With a 130 ms update time, the STT850 provides near-instantaneous feedback to the control system. This is critical for high-speed loops or safety-critical processes where a delay in temperature reporting could lead to equipment damage or unsafe conditions.
Advanced Diagnostics and Visualization: The optional advanced graphics display does more than just show the current temperature; it provides a sensor health trend. This allows operators to see how a sensor is performing over time and predict a failure before it occurs. The transmitter also features a built-in digital output option for direct control actions.
Modular and Field-Upgradable: Sharing the SmartLine platform’s DNA, the STT850 features a fully modular design. The communication module, display, and electronics can be swapped or upgraded in the field without removing the sensor, ensuring your plant stays up-to-date with the latest communication protocols like HART 7, FOUNDATION Fieldbus, or PROFIBUS PA.
Maximum Safety Compliance: The STT850 is fully compliant with SIL 2/3 requirements. Combined with its advanced diagnostics and self-monitoring capabilities, it is the premier choice for Safety Instrumented Systems (SIS) and critical interlock loops.
Technical Properties
-
Input Type: Single or Dual Universal Input (RTD, TC, Ohm, mV).
-
Digital Accuracy: Up to 0.1°C for RTD.
-
Stability: 0.01% of URL per year for 10 years.
-
Update Time: 135 ms.
-
Warranty: 15-year lifetime warranty.
-
Communication: HART 7, FOUNDATION Fieldbus, or PROFIBUS PA.
-
Safety: SIL 2/3 Certified.
-
Housing: Aluminum (epoxy coated) or 316 Stainless Steel.
Field of Application
The STT850 is designed for high-stakes environments where measurement errors are not an option.
Primary Industries and Uses:
-
Oil & Gas / Refining: Critical temperature monitoring in cracking units and high-pressure reactors.
-
Chemical Industry: High-precision control for exothermic reactions and batch processing.
-
Power Generation: Monitoring superheated steam and turbine bearing temperatures.
-
Pharmaceutical: Validated temperature measurement for aseptic processing and fermentation.
-
Custody Transfer: Accurate temperature compensation for high-value liquid and gas flow measurement.
