Ansi Engineers

The Honeywell SmartLine STT700 Temperature Transmitter is a high‑performance industrial temperature transmitter part of Honeywell’s SmartLine family, designed for accurate, reliable and stable temperature measurement in a broad range of industrial process applications. It serves as a modern replacement for legacy transmitters like the STT250, offering improved performance, advanced diagnostics, and enhanced communication capabilities for process control, safety and automation systems.

✔ Universal Sensor Support: Accepts inputs from RTD sensors (up to 4‑wire for single input or dual 3‑wire for dual input), thermocouples, and millivolt signals — giving flexibility for different temperature sensing needs.
✔ High Accuracy: Digital accuracy up to ±0.15 °C for Pt100 sensors — suitable for precise process control.
✔ Long‑Term Stability: Excellent stability with up to ±0.05 % of URL per year for up to 10 years, reducing drift and maintenance needs.
✔ Fast Response: Typical update times of 500 ms (single input) or 1 s (dual input) help ensure rapid process feedback.
✔ Advanced Diagnostics: Built‑in transmitter and sensor diagnostics including sensor break detection help improve reliability and maintenance planning.
✔ Communication: Supports HART® 7 and Honeywell Digitally Enhanced (DE) protocols for integration with DCS, PLC, and asset management systems.
✔ Mounting Flexibility: Can be mounted in the sensor head, on field housings, panel, DIN rail, or pipe, depending on installation needs and process requirements.
✔ Safety & Compliance: Certified for hazardous areas (ATEX, IECEx, FM, CSA) and compliant with SIL 2/3 requirements for use in safety instrumented systems.

• Universal Input: Supports various sensor types — allows standardization across temperature loops.
• Galvanic Isolation: Built‑in isolation enhances measurement stability and suppresses electrical noise.
• Direct RTD Calibration Support: Accepts Callendar‑Van Dusen coefficients for calibrated RTDs to improve measurement accuracy.
• Durable Construction: Designed for industrial environments with robust mechanical and electrical design.
• Direct Replacement: Designed to directly replace older SmartLine transmitters like the STT250, reducing retrofit cost and training time.

• Inputs: RTD (2/3/4‑wire), thermocouple, mV.

• Output: 4–20 mA with HART® 7 or DE communication.

• Accuracy: Up to ±0.15 °C for Pt100.

• Stability: ±0.05 % of URL per year.

• Update Time: 500 ms to 1 s.

• Certifications: ATEX, IECEx, FM, CSA, SIL 2/3

Yokogawa temperature transmitters are precision process instruments designed to convert electrical signals from temperature sensors (like RTDs, thermocouples, ohms or millivolt sources) into standardized analog and digital output signals (e.g., 4–20 mA with HART or Fieldbus) for transmission to PLC/DCS/SCADA systems in industrial automation environments. These transmitters improve accuracy, reduce noise and wiring errors, and provide advanced diagnostics and communication capabilities.
Major Yokogawa Temperature Transmitter Models �� ****
Type: Head‑mount / DIN mount temperature transmitter
Description: A compact analog temperature transmitter that accepts RTD, thermocouple, resistance or DC millivolt signals and converts them to a 4–20 mA output. It supports multiple input types, making it versatile for basic industrial temperature monitoring.
Key Features:
• 4–20 mA analog output
• Accepts 16 sensor input types (RTD, T/C, etc.)
• Head or DIN rail mountType: Panel‑mounted / DIN rail temperature transmitter
Description: Offers a 4–20 mA output with HART 7 digital communication for configuration and diagnostics. It’s ideal for systems with many measurement points mounted in junction boxes or control panels.
Key Features:
• 4–20 mA analog + HART 7 communication
• User‑selectable sensor inputs (RTD, T/C, resistance, DC)
• DIN rail mount for panel installations
Type: Field‑mount temperature transmitter
Description: A mid‑range versatile transmitter with dual compartment housing and support for HART or FOUNDATION Fieldbus communication. It can accept single or dual sensor inputs and perform advanced functions like sensor backup and averaging.
Key Features:
• Supports on‑site parameter setting via local switch
• Dual input for sensor backup or differential/average measurement
• HART 7 and FOUNDATION Fieldbus options
Type: Advanced field‑mount temperature transmitter
Description: Similar to YTA610 but with enhanced diagnostics and advanced local setting functions. It supports dual sensor input with functionality for failed sensor backup, averaging or differential temperature measurement.
Key Features:
• Dual input processing with backup, averaging, or differential functions
• Support for HART 7 and FOUNDATION Fieldbus digital protocols
• Ideal for harsh outdoor/field environments with robust dual‑compartment housing
�� Yokogawa YTA110/YTA310/YTA320 (Legacy Series)
The YTA110/310/320 series were traditional industrial temperature transmitters with support for BRAIN or HART protocols and rugged housing. These models have been largely replaced by the newer YTA610/YTA710 models but are still referenced in legacy documentation.
⚙️ Core Technology & Functions
Sensor Inputs:
• RTD sensors (Pt100)
• Thermocouples (Types J, K, T, etc.)
• DC millivolt signals
• Resistance inputs
Output & Communications:
• Standard 4–20 mA analog output for process controllers
• HART 7 digital communication for remote configuration, diagnostics and asset management
• FOUNDATION Fieldbus option on certain models for full digital integration
Mounting Types:
• Head‑mount — installed directly on sensor heads for compact installations
• Panel/DIN rail mount

Siemens temperature transmitters (marketed under the SITRANS TH/TF/TR series) are industrial‑grade signal conditioning devices that convert raw temperature sensor inputs — such as RTDs (e.g., Pt100), thermocouples, resistance sensors and millivolt signals — into a standardized, linear 4–20 mA analogue output (with optional digital communication like HART). They are designed for reliable, accurate temperature measurement and transmission in automation and process control systems across industries including power, chemical, oil & gas, utilities, manufacturing and HVAC.

✔ Universal Input Support: Accept inputs from RTD sensors, thermocouples, resistance‑based sensors, and millivolt signals.
✔ 4–20 mA Output: Standard loop‑powered current signal that is linear to temperature — ideal for PLC/DCS integration.
✔ HART Communication: Many models (e.g., SITRANS TH300, TF320/TF420) support the HART protocol for configuration, diagnostics and device management.
✔ Rugged & Reliable: Designed for harsh industrial conditions with options for IP67/IP68‑rated field housings and explosion‑proof versions for hazardous environments (ATEX/IECEx).
✔ Diagnostic Functions: Advanced diagnostics such as sensor break/short‑circuit monitoring and status indicators improve process reliability.
✔ Flexible Configuration: Configuration is possible via software tools like SIMATIC PDM or handheld communicators, enabling tailor‑made measurement ranges and calibration.
✔ Compact Mounting: Head‑mounted models are compact enough to fit in sensor connection heads (DIN 43729), while field transmitters come in robust housings for remote installation.

These are designed to be mounted directly onto the connection head of a temperature sensor (such as a thermowell or Pt100 probe). They are ideal when space is limited and when you want minimal wiring and improved signal integrity. Common models include SITRANS TH100 and TH200 — 2‑wire, loop‑powered devices typically with 4–20 mA outputs.

Benefits

• Compact design for direct sensor integration

• Simple installation in sensor head housings

• Suitable for standard industrial environments

• Often available in intrinsically safe versions for hazardous areas

These units are housed in rugged enclosures suited for remote or exposed locations — such as wall or pipe mounting near the process point. Examples include SITRANS TF320/TF420 series which support universal sensor inputs and enhanced communications.

Benefits

• Robust enclosures (often IP67/IP68) for outdoor/industrial use

• Supports HART and SIL diagnostic functions

• Enables flexible installation away from the sensor head

• Available with explosion‑proof and intrinsically safe certifications.

• Common Siemens Transmitter Series🔹 SITRANS TH100 / TH200

  🔹 SITRANS TH300

  🔹 SITRANS TF320 / TF420

  🔹 SITRANS TR300

   

   

Emerson Temperature Transmitter
Emerson temperature transmitters provide accurate and reliable temperature measurement for industrial process applications. Compatible with RTD (PT100/PT1000) and thermocouple inputs, these transmitters convert sensor signals into a standard 4–20 mA output with HART communication for easy integration with PLC, DCS, and SCADA systems. Designed for high accuracy, long-term stability, and rugged industrial environments, they are ideal for oil & gas, chemical, power, food & beverage, and water treatment industries.

Key Features:
• Supports RTD & Thermocouple inputs
• 4–20 mA output with HART
• High accuracy & stable performance
• Compact and rugged design
• Easy installation & configuration