RTD Temperature Sensing
Uses compatible resistance-temperature sensing technology for accurate and stable process-temperature measurement.
Temperature Instruments
RTD Temperature Transmitter
Accurate RTD-Based Temperature Measurement for Industrial Processes
Accurate Temperature Measurement for Industrial Process Monitoring
The FlowDo RTD Temperature Transmitter combines RTD-based temperature sensing with transmitter electronics to provide reliable process-temperature measurement for compatible industrial applications. The measured RTD resistance is processed and converted into a standardized process signal for local indication, remote monitoring and automation.
RTD SENSING
Technology
PROCESS SIGNAL
4–20 mA Output
INDUSTRIAL
Application
CONFIGURABLE
Probe & Mounting
Product Overview
Reliable RTD-Based Process Temperature Measurement
Precision temperature sensing and signal conversion engineered for industrial pipelines, tanks, and process equipment.
The FlowDo RTD Temperature Transmitter is designed for industrial applications where accurate and dependable temperature measurement is required. An RTD — Resistance Temperature Detector — uses the predictable relationship between temperature and the electrical resistance of its sensing element.
As process temperature changes, the RTD resistance changes accordingly. The transmitter electronics interpret this resistance and convert the measured temperature into a standardized process output supported by the selected configuration. This allows temperature information to be used by compatible indicators, controllers, PLC systems, SCADA platforms and other industrial automation equipment.
Note: Sensor type, measurement range, probe construction, process connection, output and housing should be selected according to the actual application.
Key Engineering Highlights
- High stability RTD resistance sensing element for repeatable process measurement
- Converts raw resistance into a linear industrial 4–20 mA process current loop
- Configurable probe lengths and sheath diameters for pipes, tanks, and ducts
- Compatible with industrial thermowells for high pressure and process isolation
- Weatherproof cast terminal head with robust industrial cable entry
Product design
Key Features
Engineered for dependable temperature monitoring across industrial processes.
Continuous Monitoring
Provides continuously updated temperature information for real-time process monitoring and control loops.
Signal Conditioning
Internal transmitter electronics process the raw RTD resistance into a linearized, usable temperature signal.
Standard Process Output
Compatible configurations provide standard 4–20 mA current loop output for straightforward industrial interfacing.
Industrial Construction
Rugged stainless steel probe and weatherproof IP65 terminal enclosure built for demanding industrial environments.
Automation Integration
Easily interfaces with digital process indicators, PID temperature controllers, PLC systems, and plant SCADA.
Verified catalogue data
Technical Specifications
Technical parameters for FlowDo RTD Temperature Transmitters.
Brand / Manufacturer
FlowDo Process Instruments
Product Name
FlowDo RTD Temperature Transmitter
Measured Parameter
Temperature
Sensor Technology
Resistance Temperature Detector (RTD)
RTD Type
According to selected model (e.g. PT100 / Model Dependent)
Element Configuration
According to selected configuration (Simplex / Duplex as supported)
Wiring Configuration
According to selected configuration (2-Wire / 3-Wire / 4-Wire)
Temperature Range
Model and application dependent
Accuracy
According to selected model and sensor class
Output Signal
Standard 4–20 mA DC / Process Signal as supported
Power Supply
According to selected transmitter configuration (Nominal 24 V DC loop powered)
Probe / Sheath Material
SS316 / SS304 Stainless Steel (According to process requirements)
Probe Diameter
According to selected model (e.g. 6 mm, 8 mm, 10 mm / Application dependent)
Insertion Length
Custom fabricated as per pipe / vessel application
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
Industries and processes
Applications
Accurate temperature measurement across key industrial processing and manufacturing sectors.
Process Industries
Continuous temperature monitoring in production reactors, mixing vessels, and fluid processing pipelines.
Water & Wastewater Treatment
Process water temperature tracking, biological aeration monitoring, and effluent treatment temperature control.
Chemical & Petrochemical
Chemical storage tanks, acid reactors, and solvent handling where wetted materials match process compatibility.
OEM Machinery & Skids
Hydraulic power units, pump skids, lubrication reservoirs, and industrial chiller packages.
HVAC & Utility Systems
Chilled water loops, boiler feedwater lines, cooling tower return manifolds, and utility air handling.
Tanks, Vessels & Heat Exchangers
Temperature measurement in thermal fluid loops, shell-and-tube exchangers, and industrial storage tanks.
System Integration
From Process Temperature to Control-System Data
Seamless signal transmission from field RTD measurement into plant automation architecture.
RTD Temperature Transmitter
Field Sensing & Conditioning Head
↓
Continuous Temperature Value
Calibrated Process Variable
↓
4–20 mA Current Loop
Standard Industrial Process Signal
↓
Local Indicator / Controller
FlowDo Digital Process Indicator / PID
PLC / Control System
Automation Logic & Alarm Interlocks
↓
SCADA & Plant Monitoring
Real-time telemetry, thermal management & historical trending
Technology Overview
Choose the Right Temperature Measurement Technology
Comparison of primary FlowDo temperature measurement instruments.
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.
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.
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 an RTD Transmitter?
Key technical parameters to define for configuring a suitable temperature measurement assembly.
Operating Range
Define normal operating temperature, minimum/maximum extremes, and required measurement span for the process.
RTD Type & Wiring
Confirm RTD sensor type (PT100/PT1000), element configuration (simplex/duplex), and 2/3/4-wire arrangement.
Fluid & Pressure
Verify process medium compatibility, fluid velocity, operating pressure, and need for a protective thermowell.
Probe & Connection
Select probe diameter, insertion length (immersion depth into pipe/vessel), and threaded or flanged process connection.
Output & Power
Determine required signal output (4–20 mA current loop), loop power supply voltage, and cable entry requirements.
Receiver Interface
Identify connecting equipment including FlowDo digital process indicators, PID controllers, PLC cards, or SCADA RTUs.
Related Instrumentation
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View details & specs →Frequently Asked Questions
RTD Temperature Transmitter FAQs
Common technical questions regarding RTD temperature sensing, transmitter conversion, and industrial installation.
What is an RTD temperature transmitter?
An RTD temperature transmitter processes the resistance signal from an RTD sensing element and converts the measurement into a standardized process signal (such as 4–20 mA) suitable for industrial monitoring and control.
How does an RTD measure temperature?
An RTD uses the predictable change in electrical resistance of its sensing element (such as platinum) as temperature changes.
What is the difference between an RTD sensor and an RTD transmitter?
The RTD sensor performs the temperature sensing by changing resistance, while the transmitter processes the RTD measurement and provides an amplified, standardized output suitable for remote indication or automation.
What is a PT100 sensor?
A PT100 is a platinum RTD with a nominal resistance of 100 ohms at 0°C. Specific sensor element availability should be confirmed for the selected FlowDo model.
What is the difference between 2-wire, 3-wire and 4-wire RTD connections?
They use different conductor arrangements for connecting the RTD to the measurement electronics. Additional conductors allow better compensation for lead-wire resistance when supported by the measurement circuitry.
Can the transmitter provide a 4–20 mA signal?
Yes, compatible FlowDo configurations provide a standard 2-wire 4–20 mA analog current loop output for direct connection to PLCs, controllers, and SCADA RTUs.
Can it connect to a PLC or SCADA system?
Compatible transmitter outputs can be connected to suitable PLC analog inputs (4–20 mA) or digital communication buses according to the selected transmitter and control-system architecture.
What is the difference between an RTD and a thermocouple?
An RTD measures temperature through resistance change and provides high stability over moderate temperature spans, while a thermocouple produces a thermoelectric voltage suitable for very high temperature ranges.
How do I select the probe length?
Probe insertion length should be selected according to pipe or vessel geometry, process connection, sensing location and any thermowell arrangement to ensure adequate immersion in the fluid stream.
Can the RTD transmitter be used with a thermowell?
Yes. A compatible thermowell isolates the sensor from direct process pressure and chemical exposure, allowing sensor inspection or replacement without draining the process line.
Need Help Selecting an RTD Temperature Transmitter?
Configure the Right Temperature Measurement Solution for Your Process
Share your temperature range, process medium, probe dimensions, process connection, mounting arrangement and required output with FlowDo to identify a suitable RTD temperature transmitter configuration.
For faster selection, provide: Temperature Range • Process Medium • RTD Type • Probe Diameter • Insertion Length • Process Connection • Thermowell Requirement • Required Output