COMET SN251E – Pt1000 Immersion Probe IP68, -50 to +200 °C, ELKA Connector

COMET SN251E – Pt1000 Immersion Probe IP68 (permanent up to 5 m depth), -50 to +200 °C, Class A, ELKA connector, silicone cable

The COMET SN251E is a highly robust Pt1000 immersion probe with IP68 protection (permanent up to 5 m water depth) and ELKA connector – the perfect solution for precise, long-term stable temperature measurement in liquids, tanks, basins, wastewater, cooling circuits, wells, aquaculture, or any other application where the sensor remains permanently under water or in humid media. With a measuring range from –50 to +200 °C and high Class A accuracy (±(0.15 + 0.002 × t) °C), it is ideally suited for industry, wastewater technology, swimming pools, solar systems, food processes, environmental monitoring, or cryogenic applications down to –50 °C.

The measuring tip made of acid-resistant stainless steel DIN 1.4404 (Ø 6 ± 0.1 mm, length 60 mm) is completely waterproof and designed for continuous immersion – even in aggressive media. The shielded 1-meter silicone cable is flexible, heat-, and chemical-resistant, and optimized for long-term immersion. The ELKA connector ensures a secure, fast, and vibration-resistant connection to COMET measuring devices, transmitters, controllers, or data loggers. IP68 (1 bar) reliably protects against dust and permanent submersion – no risk of leakage or corrosion.

The probe is maintenance-free, long-term stable, and available with a traceable calibration certificate (according to EN ISO/IEC 17025) – top quality for critical applications. Whether used as an immersion probe in tanks, as a temperature sensor in pipelines, or for continuous process control – the SN251E impresses with precision, robustness, and ease of use. Continuous immersion possible without limitation – ideal for pumps, wells, wastewater, or chemical containers.

Why the COMET SN251E is the best IP68 immersion Pt1000 probe:

• IP68 continuous immersion – up to 5 m depth, 1 bar overpressure
• Measuring range –50 to +200 °C – wide for cold & heat
• Class A accuracy – ±(0.15 + 0.002 × t) °C
• ELKA connector – safe, fast & vibration-resistant connection
• Shielded silicone cable 1 m – heat- & chemical-resistant
• Stainless steel DIN 1.4404 – acid- & corrosion-resistant
• Fast response time – t0.5 <12 s in flowing water
• Universal use – tanks, basins, wastewater, process liquids

Technical data SN251E:

• Measuring range: –50 to +200 °C
• Accuracy: ±(0.15 + 0.002 × t) °C
• Accuracy class: A
• Response time: t0.5 <12 s (in flowing water > 0.2 m/s)
• Measuring element: Pt1000 (3850 ppm/°C)
• Connection: 2-wire
• Measuring tip: Stainless steel DIN 1.4404, Ø 6 ± 0.1 mm, length 60 mm
• Cable: Shielded silicone, 1 meter
• Connector: ELKA
• Ingress protection: IP68 (1 bar)
• Warranty: 30 months

Perfectly suited for:

• Wastewater and sewage treatment plants
• Swimming pools and aquaculture
• Tanks, basins, and containers
• Cooling circuits and refrigeration systems
• Chemical and process liquids
• Wells and groundwater measurement
• COMET transmitters and loggers
• Continuous immersion measuring points up to 5 m

Installation & use – simple as can be

Immerse or fix the probe in liquid, plug the ELKA connector into a COMET device – done. The silicone cable is flexible and durable, and the IP68 rating allows permanent immersion up to 5 m depth. For optimal measurement, immerse the probe completely and protect it from condensation.

Available variants:

• Cable length 1 meter
• Cable length 2 meters
• Cable length 5 meters
• Cable length 10 meters

Summary:

• Multipurpose waterproof IP68 probe -50 to +200 °C. The probe is used for temperature measurement of gaseous and liquid substances.
• The maximum operating temperature range of the sensors is between -50 and +200 °C.
• The connection cable used is silicone-insulated and shielded.
• The probe meets protection class IP68 (1 bar) according to EN 60529 and is designed for underwater temperature measurement with continuous immersion up to a depth of 5 m.
• The application method must be selected taking into account the temperature and chemical resistance of the housing and connection cable.

Scope of delivery:

• Sensor according to order and selected cable length
• User manual