When does standard Class A RTD accuracy fall short, and what should you specify instead for precision process control?
For applications where standard 3-wire Class A tolerance introduces too much measurement uncertainty, this Precision Duplex RTD PT100 Sensor delivers ±0.15°C accuracy at 0°C through a 4+4 wire configuration, and it’s available from Buyinstrument.shop at a transparent, factory-direct fixed price with zero middleman markup and ready stock for fast nationwide dispatch.
Unlike the standard 3-wire sensors across the rest of this range, this model uses a 4-wire measurement method on each of its two independent circuits, which electronically cancels out lead wire resistance error — a source of measurement drift that becomes significant in precision applications like calibration equipment, laboratory process control, and tight-tolerance dosing systems. Rated for a -20°C to 100°C operating range, narrower than the -50°C to 400°C range of general-purpose sensors in this catalog, this sensor is specifically engineered for the moderate-temperature, high-precision use cases common in water treatment, food and beverage processing, pharmaceutical manufacturing, and HVAC precision control zones. The compact 150mm insertion length suits shallow taps and small vessels typical of these precision applications. Despite its precision focus, the sensor retains full industrial-grade construction: an SS316 sheath, compacted MgO insulation, an IP65-rated die-cast aluminum head with threaded cap and chain, and a 3/4″ ET cable entry. This sensor is manufactured by Aavad Instrument Pvt. Ltd. under ISO 9001:2015 certified manufacturing standards and is CE marked, confirming conformity with applicable EU safety, health, and environmental protection requirements.
Key Features
• 4+4 wire duplex configuration for lead-resistance-free precision measurement
• Tight ±0.15°C accuracy at 0°C, exceeding standard Class A tolerance
• Compact 150mm insertion length for shallow taps and small vessels
• Optimized -20°C to 100°C range for precision moderate-temperature applications
• IP65-rated die-cast aluminum head with 3/4″ ET cable entry
• Full redundancy with two independent precision measurement circuits
Applications
• Calibration bath and laboratory precision temperature control
• Water treatment dosing and chemical injection control
• Pharmaceutical process temperature verification
• Food and beverage precision temperature monitoring
• HVAC precision zone control
• Redundant precision sensing for quality-critical processes
FAQs
1. What’s the difference between 3-wire and 4-wire RTD measurement?4-wire RTD measurement uses separate leads for supplying measurement current and sensing the resulting voltage. This configuration allows the resistance of the connecting wires to be effectively compensated, minimizing a significant source of lead-resistance error. As a result, 4-wire RTDs can provide higher measurement accuracy than 3-wire configurations, making them particularly suitable for precision temperature measurement, laboratory applications, calibration systems, and other accuracy-critical processes.
2. Can this sensor be used outside its -20°C to 100°C rated range?
No. This specific model is designed and specified for a -20°C to +100°C operating range. Operating the sensor outside its rated range may affect measurement accuracy, stability, and service life. For applications requiring a wider temperature range, consider a -50°C to +400°C Class A RTD model from the same product range.
3. Is this sensor suitable for pharmaceutical or food-grade processes?
The sensor’s precision measurement capability and -20°C to +100°C temperature range can make it suitable for temperature monitoring in pharmaceutical, food, and beverage applications. However, hygienic installations may require specific materials, surface finishes, process connections, or certifications. If your application requires standards such as FDA, 3-A, or other hygienic compliance, confirm the applicable requirements with our team before ordering.
