Temperature Transmitters –Temperature Measurement Solutions
Introduction to Temperature Transmitters
Temperature transmitters are integral components in modern industrial process measurement, converting temperature sensor signals from RTDs, thermocouples, and sanitary probes into standardized communication outputs such as 4–20 mA, HART, Modbus, Profibus, Foundation Fieldbus, and IO-Link.
A temperature transmitter provides stable, interference-free, and accurate measurement, suitable for demanding sectors such as pharmaceutical, dairy, oil & gas, beverage, chemical, steel, energy, HVAC, and refinery process automation.
By isolating and conditioning sensor signals, transmitters eliminate electrical noise, EMI/RFI interference, ground loop errors, and long-loop signal attenuation—making them critical for industrial PLC/DCS/SCADA monitoring.
At NPK Industries, we supply a high-performance range of transmitters from leading global brands:
- Baumer Flextop 2202, 2203, 2222
- WIKA T38, T16
- Radix TX1HM
- Honeywell STT700, STT750
- Schneider RTT15S
How Temperature Transmitters Work
A transmitter converts the raw temperature response of an RTD / thermocouple into a linear, calibrated signal that controllers and automation systems can read.
Core Functional Principles:
- Signal Conditioning: Eliminates electrical, vibration-induced, and thermal distortion.
- Linearization: Converts nonlinear sensor outputs into stable °C/°F values.
- Galvanic Isolation: Prevents grounding influenced errors in PLC networks.
- Loop Powering: Enables long-distance control room runs via 2-wire / 4-wire loops.
- Digital Communication: HART/Modbus enables diagnostics and predictive maintenance.
This makes transmitters essential for steam lines, furnace applications, sterile CIP/SIP zones, reactor feedback loops, and energy management systems.
1. Baumer Temperature Transmitters – Flextop Series
Models Covered: Flextop 2202, Flextop 2222, Flextop 2203
Baumer Flextop transmitters are engineered for high stability, sanitary compatibility, and advanced digital integration.
Model | Output | Sensor Inputs | Temp Range | Approvals |
Flextop 2202 | 4–20 mA, HART | RTD, TC | -200°C to +850°C | FDA, EHEDG |
Flextop 2222 | 4–20 mA / IO-Link | RTD | -50°C to +400°C | 3A, IP69K |
Flextop 2203 | Profibus / Modbus | RTD, TC | -200°C to +850°C | CE, SIL |
Key Strengths
- High-grade hygienic construction for food, dairy, pharma
- Remote setup via Flextop software + USB
- EMI/RFI immunity for VFD & high-power panels
- CIP/SIP sterile washdown and chemical resistance
- LED status indicator on head for onsite diagnostics
2. WIKA Smart Transmitters — T38, T16
WIKA transmitters are globally recognized for precise dynamic accuracy and smart configuration.
Model | Protocol | Sensor Support | Accuracy | Features |
T38 | HART / Fieldbus | RTD, TC | ±0.1% | Hazardous zone safe, SIL2/3 |
T16 | 4–20 mA | RTD, TC | ±0.2% | Universal input, compact head mount |
Engineering Benefits
- Suitable for steam boiler loops, nitrogen dosing, hydrogen cracking
- High vibration resistance for steel mills & compressor skids
- Predictive diagnostics & drift monitoring
- Optional Ex/ATEX flameproof protection
3. Radix TX1HM Temperature Transmitter
Radix TX1HM is India’s robust automation-grade transmitter built for refinery, HVAC, and power plant environments.
Parameter | Specification |
Output | 4–20 mA |
Input | RTD Pt100, J/K thermocouples |
Housing | Flameproof / Weatherproof |
Rating | SIL, CE |
Key Features
- 2-wire loop powered
- Surge-proof design for power plants
- Compatible with fire pump rooms, boiler feed lines, and high-pressure dryers
4. Honeywell Smart Series – STT700, STT750
Honeywell STT transmitters are globally benchmarked for oil & gas, offshore drilling, petrochemical refining, and pipeline automation.
Model | Protocol | Range | Stability | Safety |
STT700 | HART, Modbus | -200°C to 1000°C | ±0.03% | SIL2 |
STT750 | HART, FF, Modbus | Up to 1600°C | ±0.02% | SIL3, ATEX |
Next-Generation Capabilities
- Smart diagnostics with Honeywell Experion DCS
- Cybersecure firmware for data integrity
- Flameproof certified for fuel farms & solvent distillation zones
- Digital asset health monitoring
5. Schneider Temperature Transmitter – RTT15S
Designed for utility automation and HVAC networks, Schneider RTT15S offers reliable performance and ease of integration.
Specification | Detail |
Protocol | 4–20 mA, analog |
Input | RTD Pt100 |
Accuracy | ±0.15% |
Typical Use | HVAC AHU, chilled water, energy tracking |
Use Case Highlights
- Process chillers, AHUs, compressor rooms
- Plug & play support for Machine PLCs, Modicon DCS
- Compact + IP65 enclosure
Advantages of Using Temperature Transmitters
Advantage | Description |
Noise-Free Signals | Eliminates long cable loss, EMI/VFD interference |
Digital Predictive Alerts | Sensor burnout, drift, short/open circuit |
Hazardous Zone Capability | ATEX, IECEx, SIL-certified |
CIP/SIP Compatibility | Hygienic transmitters for pharma & dairy plants |
Universal Inputs | RTD / TC / mV / Ω |
PLC/DCS/SCADA Friendly | Supports Modbus, HART, Profibus |
Industrial Applications
- Pharmaceutical & Biotech Manufacturing
Sterilization chambers, fermentation tanks, vaccine reactor
Oil & Gas / Petrochemical
Refining, cracking, hydrocarbon storage, burner management
Steel & Power Plants
Furnace zones, steam lines, boiler headers
Food & Beverage
Pasteurization, dairy CIP/SIP, brewing automation
HVAC & Utility Automation
Chilled water balancing, AHU, compressor load shedding
Why Choose NPK Industries
- Direct supply of global OEM-certified transmitters
- Onsite integration with PLC/DCS/SCADA networks
- Calibration & commissioning support
- Hygienic, hazardous, and automation-grade models
- Stock availability across all ranges