The vision of precise temperature monitoring in complex industrial environments without cumbersome wiring is becoming reality through innovative wireless PT100 sensor technology, offering industries more efficient and convenient solutions.

PT100 sensors operate on the Resistance Temperature Detector (RTD) principle, featuring a fine platinum wire whose resistance changes linearly with temperature. At 0°C, the sensor shows 100Ω resistance, increasing with temperature rise and decreasing with temperature drop. This characteristic makes it ideal for high-precision temperature measurement.

• Wire-wound: Traditional design with platinum wire wound on glass/ceramic bases, covered with insulating materials like alumina. Offers highest accuracy and widest temperature range but is bulkier and more expensive.
• Thin-film: Platinum printed on ceramic substrates with glass coating. More cost-effective with better vibration resistance and faster thermal response, though with narrower linear response range, particularly below -50°C.

PT100 sensors are extensively used in industrial and commercial sectors due to their high accuracy, long-term stability, and temperature resistance up to 600°C, including:

• Process control systems
• Furnace temperature monitoring
• Refrigeration systems

Converting PT100 resistance values to temperature involves applying a precise constant current to measure voltage drop across the sensor. This voltage is digitized by an Analog-to-Digital Converter (ADC) and translated into temperature readings using the Callendar-Van Dusen equation, accounting for platinum's temperature coefficient (0.385Ω/°C).

Note: This simplified table serves for estimation; higher precision requires detailed tables or linear interpolation between values.

• 2-wire: Basic setup using two connecting wires, where lead resistance affects accuracy unless calibrated.
• 3-wire: Adds a compensation wire to counter lead resistance effects, improving accuracy.
• 4-wire: Highest precision configuration using separate measurement and compensation wires, unaffected by lead length or quality.

Wireless sensors typically employ 2-wire circuits while maintaining accuracy through digital signal transmission.

PT100 sensors come in different accuracy classes, primarily Class A (higher precision) and Class B. Selection depends on:

• Required temperature range
• Environmental conditions (vibration, corrosion, pressure)
• Response time requirements

• Surface-mount: For measuring object surface temperatures using adhesives or mechanical fasteners.
• Threaded: For internal temperature measurement in liquids/pipes via threaded connections.
• Probe-type: Housed in protective sleeves (stainless steel/ceramic) for stability in harsh conditions.

Modern wireless PT100 solutions offer:

• Simplified installation without complex wiring
• Flexible placement and easy relocation
• Long-range wireless communication
• Battery-powered operation
• Robust construction for extreme environments

• 25cm probe models for deep containers
• M6 bolt-mounted sensors for machinery
• Process connection units for system integration
• Surface-mounted variants with adhesive pads
• High-temperature models resistant to 600°C

Wireless PT100 systems deliver:

• Reduced installation and maintenance costs
• Improved production efficiency
• Enhanced equipment safety
• Battery life up to 10 years in normal operation

When implementing wireless PT100 solutions:

• Moisture protection requires proper sealing
• Wireless range depends on antenna type and environmental factors
• Sensor selection should match specific application requirements