Key Benefits and Advantages
Compact and Universal Design: The STT170 features a small, standardized circular form factor that fits into any DIN Form B connection head. Its universal input capability allows it to be configured for a variety of Resistance Temperature Detectors (RTD), Thermocouples (TC), resistance (Ohm), and millivolt (mV) inputs, reducing the need for multiple transmitter types in stock.
Superior Signal Integrity: By converting sensitive sensor signals to a robust 4 to 20 mA signal at the point of measurement, the STT170 eliminates errors caused by electromagnetic interference (EMI) and lead-wire resistance over long distances. This ensures that the data reaching the DCS or PLC is highly accurate and stable.
Advanced Configuration Options: Depending on the model, the STT170 can be configured via a standard PC using a serial interface or via HART communication. This flexibility allows technicians to easily set ranges, sensor types, and burnout levels (fail-safe directions) without needing specialized hardware for every unit.
Galvanic Isolation: The STT170 provides electrical isolation between the input and the output (up to 1.5 kV AC). This protects the control system from ground loops and high-voltage surges that may occur at the sensor tip, particularly in large-scale industrial heating or power generation environments.
High Reliability and Stability: With a long-term stability of 0.1% of span per year and a wide operating temperature range, the STT170 is built for continuous duty. It includes built-in sensor error tracking and self-diagnostics to ensure the integrity of the temperature measurement at all times.
Hazardous Area Approvals: The series is available with various explosion protection ratings, including Intrinsically Safe (Ex ia) and Non-Incendive (Ex nL) versions, allowing for safe installation in the most demanding process zones.
Technical Properties
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Input Types: Pt100, Ni100 RTDs; Types B, E, J, K, L, N, R, S, T, U, W3, W5 Thermocouples.
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Output: 4 to 20 mA (Analog) or HART digital.
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Isolation: 1.5 kV AC.
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Accuracy: ±0.1% of span or better (sensor dependent).
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Power Supply: 8.0 to 35 V DC (loop-powered).
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Mounting: DIN Form B Head or DIN Rail (via adapter).
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Configuration: PC-based (STT171/173) or HART 5/7 (STT17H).
Field of Application
The STT170 series is the standard choice for general-purpose temperature monitoring where space is limited.
Primary Industries and Uses:
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Chemical & Petrochemical: Monitoring reactor and pipe temperatures in non-corrosive environments.
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Power Generation: Measuring steam and cooling water temperatures across the plant.
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Food and Beverage: Temperature control for pasteurization and storage tanks.
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HVAC and Utilities: Reliable monitoring for boiler systems and large-scale climate control.
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Manufacturing: General heat-treating and furnace temperature feedback.
