Critical Technical Advantages
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Optimized for Existing Infrastructure: The T55 is the ideal choice for plant turnarounds or sensor upgrades where the original heavy-duty thermowell is retained. This avoids the cost and mechanical complexity of replacing welded or flanged process connections.
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Maximum Safety for Hazardous Zones: FM/CSA XP Class I, Div. 1 approval ensures that the device can safely operate in environments where explosive gases or vapors are present. The robust connection head is designed to contain any internal electrical ignition.
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Superior Signal Integrity: By using an integrated iTEMP head transmitter, the T55 converts the sensitive millivolt thermocouple signal into a digital protocol (like HART or Fieldbus) directly at the source. This provides 2 kV galvanic isolation and eliminates the electromagnetic interference often associated with long thermocouple extension wires.
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Maintenance Efficiency: The “straight out of the box” design allows for immediate installation. Technicians can replace an entire measurement assembly (sensor and electronics) as a single part number, reducing time spent in the field.
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Exceptional Long-Term Stability: All integrated iTEMP transmitters offer a stability rating of $\le$0.05% per year, ensuring that the temperature measurement remains accurate and repeatable over extended periods between calibrations.
Technical Performance Matrix
| Feature | Details |
| Sensor Type | Thermocouple (Type J, K, T, E, N, etc.) |
| Approval | FM/CSA XP Class I, Div. 1 (Explosion Proof) |
| Installation Type | Designed for use in existing thermowells |
| Galvanic Isolation | 2 kV (on most transmitter models) |
| Annual Stability | $\le$0.05% (iTEMP Transmitters) |
| Communication | 4-20mA, HART, PROFIBUS PA, FOUNDATION Fieldbus |
| Industry Standard | US Style (North American specifications) |
Primary Applications
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Refinery Maintenance: Upgrading temperature sensors in high-heat areas like furnaces or crackers where the existing thermowells are still serviceable.
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Power Plant Overhauls: Replacing thermocouple points in steam lines or flue gas ducts while retaining heavy-duty primary protection tubes.
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Chemical Process Upgrades: Retrofitting older, directly-wired thermocouples with modern HART-enabled transmitters for better diagnostic capabilities.
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Offshore Platform Retrofits: Fast replacement of sensors in corrosive or high-vibration areas where FM/CSA safety ratings are required.
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Petrochemical Turnarounds: High-volume sensor replacement during scheduled maintenance to ensure maximum plant reliability.
