Honeywell STT750 temperature transmitter

Honeywell STT750 temperature transmitter

Product Overview

The Honeywell STT750 is a high-performance and value temperature transmitter from the SmartLine family, offering high accuracy and stability over a wide range of process and ambient temperatures.-6 Designed for demanding industrial automation and process control environments, the STT750 delivers reliable temperature measurement while minimizing maintenance costs and simplifying field operations.

As a core component of Honeywell’s SmartLine platform, the STT750 is engineered to meet the most demanding requirements for temperature measurement applications.-6 The STT750 temperature transmitter features a modular design that allows users to replace temperature boards, add indicators, or change electronic modules in the field without affecting overall performance or agency certifications.-11 This unique modularity results in lower inventory needs and reduced total cost of ownership.

The STT750 is available with a basic alphanumeric LCD display that can be added or removed in the field, supports 0°, 90°, 180°, and 270° position adjustments, and displays measurement units in °C, °F, °R, and Kelvin.-11 The STT750 transmitter also supports three-button integral configuration for direct field programming without additional tools.

Key Technical Specifications

Performance Characteristics

Accuracy & Stability

The STT750 delivers digital accuracy up to ±0.14°C for RTD inputs, combined with output D/A accuracy of ±0.025% of span for Pt100 sensors.-15 The transmitter maintains long-term stability of ±0.01% of URL per year sustained over a ten-year period, reducing calibration frequency and associated maintenance costs.-15

Sensor Matching

The STT750 supports direct entry of Callendar-Van Dusen coefficients (R₀, α, δ, β) for calibrated RTD sensors, enabling the transmitter to compensate for individual sensor variations and achieve measurement precision beyond standard tolerance levels.-6

Response Time

With an update time of 125 ms for single-input configurations, the STT750 provides near real-time temperature data to control systems, supporting rapid process adjustments and minimizing control loop latency.-15

Environmental & Durability Specifications

Protection Ratings

The STT750 is available with IP66 and IP67 protection grades, along with NEMA 4X rating, ensuring reliable operation in harsh industrial environments exposed to moisture, dust, and corrosive agents.-15 The dual compartment housing design separates electronics from wiring terminals for enhanced reliability and easier maintenance.

Hazardous Area Certifications

The STT750 carries comprehensive global hazardous location approvals for explosion-proof and intrinsic safety applications, including FM, CSA, ATEX, IECEx, NEPSI, KOSHA, INMETRO, SAEx, EAC, and CCoE.-15

Diagnostics Capabilities

Comprehensive on-board transmitter and sensor diagnostics

Sensor break detection (supports Namur 89 wire break)

Digitally accessible diagnostics providing advanced warning of possible failure events

Minimizes unplanned shutdowns and lowers operational costs

Built-in galvanic isolation for enhanced signal integrity

Applications & Industries

The STT750 temperature transmitter is suitable for a wide range of control and safety applications across multiple industries.-15

Typical Applications:

Oil & Gas: Refinery process temperature monitoring, pipeline temperature control

Chemical Processing: Reactor temperature management, exothermic reaction monitoring

Power Generation: Boiler feedwater temperature, steam temperature control

Pharmaceuticals: Sterilization validation, bioreactor temperature measurement

Food & Beverage: Pasteurization, cooking process control

Pulp & Paper: Digester temperature control, drying cylinder monitoring

Compatible Systems: Honeywell Experion PKS, Honeywell TotalPlant Solutions (TPS), any 4-20 mA loop-powered input cards, DCS, PLC, SCADA systems

Configuration & Diagnostics

The STT750 transmitter supports multiple configuration methods:

Integral Three-Button Configuration: Externally accessible buttons allow field configuration without opening the housing; zero/span capabilities are optionally available-11

Handheld Configuration: Honeywell MC Toolkit supports field configuration of HART devices for intrinsically safe environments-11

PC Configuration: Field Device Manager (FDM) Software and FDM Express for managing HART device configurations-11

The STT750’s advanced diagnostics suite includes digitally accessible diagnostic data that provides advanced warning of potential failure events, helping to minimize unplanned shutdowns and reduce overall operational costs.-11

Ordering Information