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ABB TTH300-E1H Temperature Transmitter 

1. Key Parameters

• Product Model: TTH300-E1H
• Product Type: 2-wire loop-powered temperature transmitter (for RTD/thermocouple input)
• Core Function: Converts sensor temperature signals (RTD/thermocouple) into linear 4~20mA DC output; supports temperature range scaling and fault diagnostics
• Sensor Compatibility:
  • RTD Input: Pt100 (IEC 60751, Class A/B), Pt500, Pt1000; Cu50, Cu100
  • Thermocouple Input: Type J, K, T, E, R, S, B, N (compliant with IEC 60584)
  • Resistance Input Range: 0~4000Ω (for RTDs)
  • Voltage Input Range: -75mV~+75mV (for thermocouples)
• Measurement Performance:
  • Accuracy (RTD Input): ±0.1℃ (at 0~100℃, Pt100 Class A); ±0.2℃ (full range)
  • Accuracy (Thermocouple Input): ±0.3℃ (Type K, 0~400℃); ±0.5℃ (full range for all types)
  • Temperature Range (Configurable): -200℃~+1800℃ (dependent on sensor type)
  • Output Signal: 4~20mA DC (2-wire loop; proportional to measured temperature)
  • Loop Power Supply: 10.5V DC~30V DC (typical 24V DC industrial standard)
  • Loop Current Consumption: ≤20mA (max; includes output current and internal circuitry)
• Mechanical Specifications:
  • Housing Type: Explosion-proof (Ex d IIC T6 Ga) and weatherproof (IP66/IP68); suitable for hazardous areas
  • Material: Aluminum alloy (housing); stainless steel 316L (sensor connection thread)
  • Process Connection: ½"NPT or M20×1.5 (threaded; compatible with standard sensor fittings)
  • Electrical Connection: 2-wire terminal block (accepts 0.5mm²~2.5mm² copper conductors)
  • Dimensions (H×W×D): 120mm × 65mm × 45mm (compact design for tight installations)
  • Weight: Approximately 350g
• Environmental Ratings:
  • Operating Temperature Range: -40℃~+85℃ (-40℉~185℉)
  • Storage Temperature Range: -50℃~+100℃ (-58℉~212℉)
  • Humidity Tolerance: ≤95% RH (non-condensing, 40℃)
  • Vibration Resistance: 10~500Hz, 2g acceleration (IEC 60068-2-6; no performance drift)
  • Shock Resistance: 50g acceleration (11ms duration, IEC 60068-2-27; maintains accuracy)
• Compliance Standards: IEC 61298-1 (process transmitters), ATEX/IECEx (explosion protection), IP66/IP68 (ingress protection), UL 1203 (hazardous locations)

2. Key Features

• Dual Sensor Compatibility: Supports both RTDs and thermocouples, eliminating the need for separate transmitters for different sensor types—reducing inventory and installation costs.
• High Measurement Accuracy: ±0.1℃ precision for RTD inputs (at 0~100℃) ensures reliable temperature data for critical processes (e.g., pharmaceutical batch mixing, food sterilization) where small temperature deviations affect product quality.
• Explosion-Proof & Weatherproof Design: Ex d IIC T6 Ga certification and IP66/IP68 rating enable safe operation in hazardous areas (e.g., oil refineries, chemical plants) and outdoor environments (e.g., pipeline monitoring, solar farms).
• Loop-Powered Efficiency: 2-wire design uses the same loop for power supply and signal transmission—simplifies wiring (no separate power cable) and reduces installation complexity, especially in remote locations.
• Configurable Temperature Scaling: Allows users to program custom temperature ranges (e.g., 0~200℃ instead of full sensor range) via ABB’s PC-based configuration software (e.g., ABB FieldCare)—ensuring the 4~20mA output is optimized for specific process needs.
• Built-In Diagnostics: Monitors sensor faults (open circuit, short circuit), power supply anomalies, and internal component health. Transmits fault signals (e.g., <3.8mA or >20.5mA) to upper systems, enabling proactive maintenance and reducing downtime.
• Wide Environmental Adaptability: Withstands extreme temperatures (-40℃~+85℃), vibration, and humidity—reliable for harsh industrial conditions like mining sites, steel mills, and offshore platforms.

3. Application Fields

• Chemical & Petrochemical Industry: Measures temperature in reactors, distillation columns, and storage tanks—ensuring process stability and compliance with safety standards (e.g., preventing overheating of flammable materials).
• Pharmaceutical Manufacturing: Monitors temperature in sterilization autoclaves, freeze dryers, and batch mixers—maintaining precise conditions to meet FDA/GMP regulations and ensure product efficacy.
• Food & Beverage Production: Tracks temperature in pasteurizers, ovens, and cold storage units—preventing bacterial growth and ensuring food safety (e.g., dairy pasteurization at 72℃ for 15 seconds).
• Oil & Gas Upstream/Downstream: Used in offshore drilling rigs, crude oil pipelines, and refineries—withstanding explosive atmospheres and salt spray to monitor fluid temperatures during extraction and processing.
• Power Generation: Measures temperature in turbine bearings, boiler tubes, and cooling systems—preventing equipment overheating and optimizing energy efficiency in thermal, nuclear, and renewable energy plants.
• HVAC & Building Automation: Controls temperature in large commercial buildings (airports, shopping malls) and industrial facilities—optimizing heating/cooling systems to reduce energy consumption.

4. Precautions

• Sensor Compatibility Check: Ensure the connected RTD/thermocouple matches the transmitter’s configured input type (e.g., Pt100 for RTD mode, Type K for thermocouple mode). Mismatched sensors cause incorrect temperature readings or fault alarms.
• Explosion-Proof Installation: In hazardous areas, install the transmitter per ATEX/IECEx guidelines—use certified cable glands (Ex d-rated) and ensure the housing is tightly sealed (torque bolts to 2.5N·m) to maintain explosion protection.
• Wiring Best Practices:
  • Use shielded twisted-pair cables (0.5mm²~2.5mm²) to minimize EMI interference from nearby power cables.
  • Ground the cable shield at the DCS/PLC end (single-point grounding) to avoid ground loops.
  • Keep wiring distance ≤1000m (for 24V DC supply) to prevent voltage drops that affect output accuracy.
• Calibration Schedule: Calibrate the transmitter annually using a precision temperature calibrator (e.g., ABB CPC600). Drifted calibration leads to measurement errors—critical for processes requiring strict temperature control.
• Environmental Protection:
  • Avoid submerging the transmitter beyond IP68 limits (max 2m depth for 24 hours) unless specified for underwater use.
  • In corrosive environments (e.g., coastal areas, chemical plants), use anti-corrosion coatings on the aluminum housing or select stainless steel variants.
• Configuration Safety: Use only ABB’s official configuration software (FieldCare) to modify settings. Unauthorized tools may corrupt firmware or cause incorrect output signals. Back up configuration data before making changes.
• Fault Handling: If a fault signal is detected (e.g., <3.8mA), first check the sensor (open/short circuit) and power supply (10.5V~30V DC). Do not reset the transmitter without identifying the root cause—unaddressed faults may lead to process shutdowns

The structure and details of the product：

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