Why specify a duplex configuration on a 1200mm temperature sensor instead of a standard simplex probe?
Redundancy matters most on sensors installed at greater insertion depths, where pulling the probe for a simplex circuit failure means more downtime, and this PT100 Duplex Temperature Sensor at 1200mm is available from Buyinstrument.shop at a transparent, factory-direct fixed price with zero middleman markup and ready stock for fast nationwide dispatch.
This sensor houses two fully independent 3-wire PT100 circuits (3+3 wire) inside a single SS316 sheath packed with compacted MgO insulation, delivering a -50°C to 400°C operating range with Class A accuracy across both circuits. The duplex design means that if one measurement circuit degrades or fails, instrumentation teams can switch to the backup circuit without shutting down the process or physically removing a 1200mm-deep sensor — a meaningful maintenance advantage at this insertion length compared to shorter simplex sensors where removal is a quicker task. The IP65-rated die-cast aluminum head, complete with threaded cap, safety chain, and 3/4″ ET cable entry, provides robust protection against dust and splash exposure suited to general industrial plant conditions, while the 1/2″ BSP adjustable compression fitting allows engineers to fine-tune the exact mounting depth during commissioning. The nickel-plated ceramic terminal block ensures stable, corrosion-resistant duplex wiring termination for long-term reliability. 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
• 1200mm insertion length with full duplex redundancy
• Dual 3+3 wire independent PT100 circuits for backup sensing
• Class A accuracy across a -50°C to 400°C range
• IP65-rated die-cast aluminum head with 3/4″ ET cable entry
• Adjustable compression fitting for precise on-site depth setting
• SS316 sheath with compacted MgO insulation for durability
Application
• Critical reactor and tall vessel temperature monitoring
• Redundant sensing for safety instrumented systems
• Chemical process control loops requiring backup circuits
• Power plant critical temperature monitoring points
• Pharmaceutical process temperature verification
• DCS/PLC cross-checked temperature measurement
FAQs
1. How much more does duplex cost compared to the simplex version at the same length?Duplex RTD sensors generally carry a modest price premium over equivalent simplex models because they include an additional independent PT100 measurement circuit. The added circuit provides built-in redundancy, which can help reduce the need for a second sensor installation and minimize potential maintenance downtime associated with a single sensing circuit failure.
2. Can both circuits be monitored simultaneously?
Yes. Both independent PT100 circuits can be connected and monitored simultaneously for temperature cross-verification and redundant measurement. Alternatively, one circuit can remain available as a backup while the primary circuit is used for normal operation. The appropriate configuration depends on your PLC, DCS, controller, or safety system architecture.
3. Is this sensor suitable for safety instrumented systems (SIS)?
The duplex configuration can be considered for critical control loops and safety-related applications where independent sensing circuits are required to support measurement redundancy. However, using a sensor within a Safety Instrumented System (SIS) does not by itself establish SIS compliance. Final suitability depends on the complete safety system design, sensor specifications, installation, proof-test requirements, and applicable safety standards. Consult your qualified safety engineer for system-level requirements and certification.
