ABB TTH300 Head-Mount Temperature Transmitter

The ABB TTH300 Head-Mount Temperature Transmitter is an advanced, high-precision instrument designed to satisfy the rigorous demands of modern industrial process measurement and automation. Constructed with a compact DIN Form B head-mounting design, the TTH300 converts temperature-dependent sensor signals into stable, linear standardized communication output signals across diverse process applications.

Flexible Dual-Input Capability and Signal Conversion

Equipped with two universal sensor input channels, the ABB TTH300 supports a broad range of temperature sensing elements. It accommodates resistance thermometers (RTD Pt100, Pt500, Pt1000, Ni, Cu), thermocouples (Types B, E, J, K, N, R, S, T, C, D, U, L), linear resistance measurements up to 5000 Ω, and millivolt DC voltages. The transmitter allows single-sensor configuration as well as dual-sensor modes including mean measurement, differential temperature measurement, automatic sensor redundancy switching, and continuous sensor drift monitoring. High-resolution 24-bit analog-to-digital conversion ensures precise, reliable temperature tracking even under unstable thermal dynamics.

Multi-Protocol Digital Communication

Designed for seamless system integration, the TTH300 offers versatile protocol choices:

• 4 to 20 mA / HART Communication: Fully compliant with HART 5 and HART 7 protocol standards, providing configurable analog output with digital signal modulation.

• PROFIBUS PA: Compliant with PA Profile 3.01 and FISCO standards for process automation networks.

• FOUNDATION Fieldbus: Standardized fieldbus integration providing interoperability in automated plant architectures.

Functional Safety, Diagnostics, and Asset Integrity

Security and operational availability are core components of the TTH300 architecture. Engineered according to IEC 61508 standards, the device supports SIL 2 (and SIL 3 in redundant architectures) applications. Diagnostic monitoring adheres strictly to NAMUR recommendations, including NE 89 for sensor wire break and corrosion detection, NE 53 for software/hardware versioning, and NE 107 for standardized device status signaling and diagnostic history. Configurable error signals (high alarm / low alarm) ensure immediate loop feedback in fault conditions.

Applications

• Chemical & Petrochemical Processing: Continuous temperature control in reactors, distillation columns, and pipelines.

• Oil & Gas Industry: Upstream, midstream, and downstream thermal monitoring in hazardous environments requiring explosion protection.

• Power Generation: Thermal monitoring of boilers, turbines, cooling systems, and heat exchangers.

• Water & Wastewater Management: Temperature control across treatment processes and distribution loops.

• Pharmaceutical & Food Processing: Precise thermal sensing adhering to strict calibration accuracy requirements.

• General Machinery & OEM Equipment: Head-mount temperature signal conversion for process machinery and skid systems.

Technical Specifications

• Input Types (Dual Universal Inputs):

  • Resistance Thermometers (RTD): Pt100 (IEC 60751, JIS C1604, MIL-T-24388), Pt10, Pt50, Pt200, Pt500, Pt1000; Ni50, Ni100, Ni120, Ni1000; Cu10, Cu100.

  • Thermocouples: Types B, E, J, K, N, R, S, T (IEC 60584), U, L (DIN 43710), C, D (ASTM E988).

  • Resistance Measurement: 0 to 500 Ω / 0 to 5000 Ω.

  • Voltage Measurement: -125 to 125 mV / -125 to 1100 mV.

• Output Signals: 4 to 20 mA (HART), PROFIBUS PA (31.25 kBit/s), FOUNDATION Fieldbus.

• Measurement Accuracy:

  • RTD Pt100: ±0.08 °C (±0.14 °F).

  • D/A Converter Accuracy: ±0.05% of configured span.

  • Long-Term Drift: ±0.05 °C (±0.09 °F) or ±0.05% per year.

• Input Connection Types: 2-wire, 3-wire, or 4-wire circuits.

• Functional Safety: SIL 2 / SIL 3 certified according to IEC 61508 (HART version).

• Diagnostics: Sensor wire break & short circuit detection (NE 89), device status signaling (NE 107), loop current monitoring.

• Ambient Operating Temperature: -50 °C to 85 °C (-58 °F to 185 °F).

• Electrical Housing / Mounting: DIN Form B head mounting (diameter: 44.4 mm / 1.75 in), optional 35 mm DIN rail adapter.

• Explosion Protection: ATEX, IECEx, FM, CSA, NEPSI, INMETRO (Ex ia / Ex ec / Zone 0, 1, 2).

FAQ

Q1: What communication protocols are supported by the ABB TTH300 temperature transmitter? A: The ABB TTH300 supports 4 to 20 mA with HART protocol (HART 5 / HART 7), PROFIBUS PA (PA Profile 3.01), and FOUNDATION Fieldbus communication.

Q2: Can the TTH300 handle dual temperature sensor inputs? A: Yes, the TTH300 features two independent sensor inputs. It supports single-sensor measurements as well as dual-sensor functions such as differential measurement, average/mean calculation, automatic sensor redundancy, and sensor drift detection.

Q3: What type of temperature sensors can be connected to the TTH300? A: The TTH300 accepts universal inputs, including various RTD resistance thermometers (such as Pt100, Pt1000, Ni, Cu), standard thermocouples (Types B, E, J, K, N, R, S, T, C, D, U, L), direct resistance up to 5000 Ω, and DC voltages up to 1100 mV.

Q4: Is the ABB TTH300 suitable for installation in hazardous areas? A: Yes, the TTH300 comes with extensive global approvals for explosive atmospheres, including ATEX, IECEx, FM, CSA, NEPSI, and INMETRO certifications for Intrinsic Safety (Zone 0, 1, 2) and non-sparking/increased safety applications.

Q5: How can the ABB TTH300 temperature transmitter be configured? A: The TTH300 can be configured remotely using standard DTM, EDD, and FDI (FIM) software tools over HART or Fieldbus protocols. Local configuration and process variable display are also available via an optional attachable LCD display with push buttons.

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