Thermocouple Input
Designed to receive the low-level millivolt voltage generated by compatible industrial thermocouple sensors.
Temperature Instruments
Thermocouple Temperature Transmitter
Reliable Thermocouple-Based Temperature Measurement for Industrial Processes
Reliable Thermocouple Signal Conversion for Industrial Temperature Monitoring
The FlowDo Thermocouple Temperature Transmitter processes the low-level millivolt signal generated by a compatible thermocouple sensor and converts it into a standardized process output for accurate temperature indication, remote monitoring and plant automation.
THERMOCOUPLE
Technology
THERMOELECTRIC mV
Input Signal
PROCESS OUTPUT
4–20 mA Signal
CONFIGURABLE
Probe & Mounting
Product Overview
Thermocouple Measurement with Industrial Signal Transmission
Precision thermoelectric signal conditioning engineered for industrial thermal processes, furnaces, pipelines, and equipment.
The FlowDo Thermocouple Temperature Transmitter is designed for industrial applications where process temperature must be measured using a compatible thermocouple and transmitted to remote monitoring or control equipment. A thermocouple consists of two dissimilar metallic conductors joined at a sensing junction, where a temperature difference produces a small thermoelectric voltage (Seebeck effect).
The transmitter measures this low-level millivolt signal, applies required cold-junction compensation and conditioning, and converts the resulting temperature measurement into a standardized process output supported by the selected FlowDo configuration. The output can then be directly interfaced with indicators, controllers, PLC systems, and SCADA platforms.
Note: Thermocouple type, temperature range, probe/sheath construction, process connection, output and housing should be selected for the actual process application.
Key Engineering Highlights
- Compatible with supported thermocouple sensor inputs (e.g. Type K / Model Dependent)
- Converts low-level millivolt thermoelectric signals into noise-immune 4–20 mA process loops
- Incorporates reference-junction / cold-junction compensation for accurate measurement
- Wide operational temperature range capability suited to high-temperature thermal processes
- Rugged industrial weatherproof terminal head with secure cable gland termination
Verified catalogue data
Technical Specifications
Technical parameters for FlowDo Thermocouple Temperature Transmitters.
Brand / Manufacturer
FlowDo Process Instruments
Product Name
FlowDo Thermocouple Temperature Transmitter
Measured Parameter
Temperature
Sensor Technology
Thermocouple (Thermoelectric Effect)
Supported Thermocouple Types
According to selected FlowDo model (e.g. Type K / Model Dependent)
Input Signal
Thermocouple millivolt (mV) signal
Temperature Range
According to thermocouple type and selected model span
Accuracy
According to selected model and sensor calibration
Cold-Junction Compensation
Internal / According to selected transmitter configuration
Output Signal
Standard 4–20 mA DC / Process Signal as supported
Power Supply
According to selected configuration (Nominal 24 V DC loop powered)
Probe / Sheath Material
SS316 / Inconel / Ceramic (According to process temperature and medium)
Probe Diameter
According to selected configuration (Application dependent)
Insertion Length
Custom fabricated as per pipe, vessel or equipment geometry
Process Connection
Threaded (1/2" BSP/NPT), Flanged, or Thermowell Mounted
Enclosure Protection
Die-cast Aluminum IP65 / Weatherproof Head
Primary Application
Industrial Process Temperature Measurement & Control
Product design
Key Features
Engineered for dependable temperature monitoring across demanding industrial environments.
Signal Conditioning
Processes raw thermocouple millivolts into a standardized, linearized, and noise-immune industrial signal.
Continuous Monitoring
Provides continuously updated process temperature information for automated control systems and telemetry.
Cold-Junction Compensation
Accounts for the reference-junction terminal temperature to ensure accurate real-world process readings.
Standard Process Output
Compatible FlowDo configurations provide 4–20 mA current loop output for straightforward control integration.
Automation Integration
Supported outputs interface smoothly with digital process indicators, PID controllers, PLCs, and SCADA.
Industries and processes
Applications
Thermocouple-based temperature monitoring across key thermal and process manufacturing sectors.
Furnaces, Ovens & Kilns
High-temperature monitoring in industrial heat treatment furnaces, drying ovens, and ceramic kilns.
Boilers & Thermal Systems
Flue gas monitoring, boiler exhaust ducts, steam headers, and thermal fluid distribution lines.
Chemical & Petrochemical
Process reactors, cracking units, distillation columns, and chemical piping with compatible wetted materials.
Power & Energy Utilities
Turbine exhaust ducts, generator cooling circuits, heat recovery steam generators (HRSG), and energy plants.
OEM Machinery & Skids
Hot melt skids, plastic extrusion lines, die casting equipment, and industrial thermal packaging machinery.
Tanks, Vessels & Pipelines
Process-fluid temperature measurement across industrial storage vessels and high-temperature transport piping.
System Integration
From Thermocouple Measurement to Process Automation
Seamless signal transmission from field thermocouple measurement into plant automation architecture.
Thermocouple Temperature Transmitter
Field Sensing & Millivolt Conversion Head
↓
Continuous Temperature Value
Compensated Process Variable
↓
4–20 mA Current Loop
Standard Industrial Process Signal
↓
Local Indicator / Controller
FlowDo Digital Process Indicator / PID
PLC / Control System
Thermal Management & Alarm Interlocks
↓
SCADA & Plant Monitoring
Real-time telemetry, thermal profiling & historical trending
Technology Overview
Choose the Right Temperature Measurement Technology
Comparison of primary FlowDo temperature measurement instruments.
Thermocouple Transmitter
- Principle
- Thermoelectric voltage (Seebeck effect)
- Signal Output
- Standard 4–20 mA current loop
- Measurement
- Continuous wide-range temperature
- Best Considered For
- High-temperature thermal systems, furnaces, boilers, kilns, and exhaust gas streams.
RTD Temperature Transmitter
- Principle
- RTD electrical resistance change
- Signal Output
- Standard 4–20 mA current loop
- Measurement
- Continuous high-precision temperature
- Best Considered For
- Industrial processes, tanks, and pipelines requiring high accuracy and repeatability up to 400°C.
Technology selection should consider medium characteristics, operating temperature range, required measurement accuracy, installation access, environmental conditions, and automation requirements.
Application Engineering
What Should Be Considered Before Selecting a Thermocouple Transmitter?
Key technical parameters to define for configuring a suitable temperature measurement assembly.
Operating Range
Define minimum, normal, and peak operating temperatures to select the appropriate thermocouple type and sheath rating.
Thermocouple Calibration
Confirm thermocouple type (e.g. Type K / J / T / etc.) and junction construction (grounded for fast response or ungrounded for isolation).
Atmosphere & Medium
Check oxidizing, reducing, or corrosive chemical characteristics to select suitable probe sheath materials (SS316, Inconel, Ceramic).
Probe & Connection
Determine probe diameter, insertion length (immersion depth), process mounting thread/flange, and thermowell compatibility.
Output & Polarity
Confirm 4–20 mA process output, power supply voltage, proper thermocouple conductor polarity (+/−), and cable routing.
Receiver Interface
Identify connecting automation equipment including FlowDo digital process indicators, PID controllers, PLCs, or SCADA RTUs.
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Thermocouple Temperature Transmitter FAQs
Common technical questions regarding thermocouple sensing, Seebeck effect, signal conversion, and industrial installation.
What is a thermocouple temperature transmitter?
A thermocouple temperature transmitter receives the low-level voltage generated by a thermocouple, processes the measurement and converts it into a standardized output (such as 4–20 mA) suitable for monitoring or control.
How does a thermocouple measure temperature?
A thermocouple uses two dissimilar conductor materials. A temperature difference between the measuring junction and reference connections produces a thermoelectric voltage related to temperature.
What is the Seebeck effect?
The Seebeck effect describes the thermoelectric voltage generated when a closed circuit formed by two dissimilar metals experiences a temperature gradient across its junctions.
What is cold-junction compensation (CJC)?
Cold-junction compensation accounts for the ambient temperature at the thermocouple reference connection terminal so the actual process temperature at the measuring tip can be calculated accurately.
Which thermocouple types does the FlowDo transmitter support?
Supported thermocouple types depend on the selected FlowDo model and configuration (such as Type K / Model Dependent). Available inputs should be verified for the specific requirement.
Can it provide a 4–20 mA output?
Yes, compatible FlowDo configurations provide a standard 2-wire 4–20 mA analog current loop output for direct interfacing with PLCs and control systems.
Can it connect to a PLC or SCADA system?
Yes, when the transmitter's process output is connected to compatible analog PLC input cards (4–20 mA) or digital telemetry RTUs.
What is the difference between a thermocouple and an RTD?
A thermocouple produces a thermoelectric voltage suitable for broad and high-temperature ranges, whereas an RTD changes electrical resistance with temperature and provides high stability over moderate ranges.
Why does thermocouple polarity matter?
Thermocouple signals are polarity-sensitive (+/−), so positive and negative conductors must be connected correctly to the transmitter terminals to prevent inverse readings.
Can I use normal copper cable to extend a thermocouple?
No, standard copper wire creates secondary thermocouple junctions that cause measurement errors. Proper thermocouple extension or compensating cable matching the thermocouple type must be used between the sensor and transmitter.
Can the sensor be installed inside a thermowell?
Yes. A compatible thermowell isolates the thermocouple probe from direct process pressure, corrosive chemicals, and high velocities, allowing sensor replacement without system depressurization.
How do I select the probe insertion length?
Insertion length should be chosen to position the measuring junction sufficiently into the fluid stream (typically 1/3 to 1/2 of pipe diameter) to prevent heat dissipation errors through the pipe wall.
Need Help Selecting a Thermocouple Transmitter?
Configure the Right Temperature Measurement Solution for Your Process
Share your temperature range, thermocouple type, process medium, probe dimensions, connection, mounting arrangement and required output with FlowDo to identify a suitable thermocouple temperature transmitter configuration.
For faster selection, provide: Temperature Range • Thermocouple Type • Process Medium • Probe Diameter • Insertion Length • Process Connection • Thermowell Requirement • Required Output