Valcom T7T Series

What is it?

The T7T Series is a line of smart electronic transmitters built for accurate temperature measurement. Each unit provides a standard 4–20 mA output along with HART® digital communication, making it compatible with modern automation and control systems. The design allows for both built-in configuration via display and push-buttons, or remote configuration through any HART®-compatible communicator.

Where is it used?

The T7T transmitter is used widely across many industrial sectors, from chemical and petrochemical plants, oil & gas facilities, to marine/offshore installations, food & beverage, water treatment and more. It is suitable for installations on pipes or tanks, and can be mounted with or without a thermowell, making it adaptable to diverse process environments.

How does it work?

T7T works by accepting a standard temperature sensor input (e.g. a Pt100 RTD). The onboard electronics convert the sensor’s signal into a 4–20 mA analog output, and simultaneously make temperature readings and diagnostics available via HART®. Configuration and calibration can be done locally on the device or remotely with a HART® communicator. The flexibility in mounting (direct to pipe/tank, with or without thermowell, or with remote sensor bracket) allows easy integration into many different setups.

What problems does it solve?

The T7T Series solves several common challenges in industrial temperature measurement: it ensures accurate and stable temperature readings, provides both analog and digital outputs for flexible monitoring and control, and supports remote configuration and diagnostics, making maintenance and calibration easier. Its versatile mounting options simplify installation on various types of equipment, and the combination of reliability and flexibility makes it a practical solution across different process industries.

Electrical / Output

Supply voltage: 12.5 ÷ 30 V DC
Output signal: 4–20 mA + HART® Rev 6
Alarm values: 3.85 mA / 21 mA
Maximum load for HART operation: 220 Ω < RL < 600 Ω (depending on supply voltage)

Measurement / Performance

Measurement principle: Thermoresistance (e.g. PT100) + smart electronic transmitter
Digital accuracy (electronics part): < ± 0.1% FS
Measured-value update frequency (4–20 mA + HART): ≈ 1 s
Polling time: ≈ 800 ms (for 4–20 mA + HART)
Response time (standard HART): < 256 ms
Adjustable damping (smoothing): 0 ÷ 60 s
Long-term stability: < 0.1% FS per year

Operating & Environmental Conditions

Ambient (operating) temperature: –40 °C to +85 °C
Process temperature (standard version): –40 °C to +85 °C; for higher-temperature versions: thermowell-based up to 150 °C (nipple-union-nipple), and remote sensor versions up to 350 °C (without thermowell) or 500 °C (with thermowell).
Display head working temperature: –10 °C to +65 °C
Storage temperature: –40 °C to +90 °C
Ingress protection / housing rating:
IP67 for AISI 316 housing
IP66 for aluminum housing version
Vibration tolerance: according to IEC 60068-2-6 standard
Relative humidity tolerance: < 98% RH, non-condensing

Process Connections & Mechanical / Housing Options

Multiple sensor and housing options (thermowells / sensor lengths / sensor materials), including PT100 sensors (DIN A, B, 1/3 DIN, etc.)
Process connections: e.g. 1/2" NPT-M or flanged / screwed thermowell options depending on configuration. Wetted parts and housing materials: AISI 316 stainless steel standard; other alloys available for aggressive media.
Options include various enclosure types (fixed head, rotating head, aluminium housing) depending on needs.

Certifications & Approvals

Certified for hazardous areas under ATEX / Ex ia (gas and dust zones), e.g. II 1G Ex ia IIC T6/T5 Ga and II 1D Ex ia IIIC T85°C/T100°C Da.
Compliant with PED directive (2014/68/EU) for pressure equipment (up to Category III for Group 1 fluids) when applicable.
Compliant with EMC directive (2014/30/EU).
Functional safety rating: SIL2 (with documented reliability data).
Marine type approval available for marine/offshore use (e.g. RINA type approval) when ordered.

T7T Series Datasheet

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