The Honeywell STT25H-0-EN0-TTE-000-0D is the STT250 modular intelligent temperature transmitter in the STT3000 series. It uses the HART communication protocol and is specifically designed for industrial process temperature monitoring and control.

I. Model Code Analysis (STT25H-0-EN0-TTE-000-0D)

STT25H: Basic model, HART protocol (blue terminal)

0: Standard type (non-SIL)

EN0: Standard configuration, no display

TTE: Input type configuration (supports RTD/TC/millivolts/ohms)

000: Standard range and calibration

0D: Output and certification configuration (4-20mA, intrinsically safe/explosion-proof certified)

II. Core Technical Parameters

Power Supply: 11 ~ 35 VDC

Output: 4-20 mA (with HART digital communication)

Input Signals:

RTD: 2/3/4 wire Pt100, Pt200

TC: J, K, T, E, R, S, B, N, etc.

millivolts (mV): 0 ~ 45 mV

Ohms (Ohm): 0 ~ 1000 Ω

Accuracy: ±0.05% ~ ±0.1% Range (varies depending on sensor type)

Ambient Temperature: -40°C ~ +85°C

Weight: Approx. 90g (module body)

Installation: Can be directly installed in the sensor head, DIN rail, or standard protective tube

Explosion-proof Certification: ATEX, CSA, FM (Intrinsically Safe Ex ia / Explosion-proof Ex d)

III. Main Functional Characteristics

HART Communication: Supports HART 5/6 protocol, enabling remote configuration, diagnostics, and calibration

Sensor Compatibility: Supports all sensor inputs, including lead resistance compensation (RTD) and cold junction compensation (TC)

Fail-safe: Hardware fail-safe setting (output upper/lower limit)

Online Diagnostics: Real-time monitoring and alarm for sensor open circuit, short circuit, and over-limit faults

Structure: Compact modular design, adaptable to harsh industrial environments

IV. Typical Applications

Temperature monitoring in industrial processes such as petrochemicals, power plants, metallurgy, and pharmaceuticals

Works with various temperature sensors (RTDs, thermocouples) to convert signals into standard 4-20mA+HART signals

Suitable for automated control systems requiring remote monitoring and intelligent diagnostics

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