6x50mm Steel Sensor Head

Steel Sensor Head 6x50mm Sheath

Temperature Heat Sensor Case Metal Tube Pipe D818b20 Ntc Lm35 PT100 Protector

     The 6x50mm steel sensor head is a stainless steel tube, closed at one end and open at the other, used to protect temperature sensors from liquid, moisture, impacts and other external effects. TO-92 package sensors such as the DS18B20 and LM35, as well as NTC thermistors and PT100 / PT1000 elements, are placed inside the sheath; filling the gap with epoxy gives a robust and long-lasting temperature probe.

     The 6mm outer diameter and 50mm length are the body size used in many ready-made waterproof DS18B20 probes on the market. The approximately 5mm inner diameter is enough for a TO-92 package sensor to fit; since the TO-92 body is also about 5mm wide, the fit is tight. The thin metal wall transfers the ambient temperature to the sensor, and the polished stainless surface resists oxidation.

     It lets you build your own probe for thermostat projects measuring temperature in liquid or humid environments such as aquariums, incubators, greenhouses, fridges, pools and hot water tanks. If you need a different length or diameter, 4x50mm, 5x30mm, 6x30mm, 6x100mm, 6x120mm, 8x50mm and 8x100mm options are also available in our store.


Features:

• Product type: Stainless steel temperature sensor protective sheath closed at one end (thermowell)
• End design: One end closed with a flat cap, the other end open for the sensor and cable
• Compatible sensors: DS18B20, LM35, NTC thermistor, PT100 / PT1000 element and other TO-92 package temperature sensors
• Mounting: The sensor is placed inside the sheath and fixed by filling the gap with epoxy
• Protection: Protects the sensor against liquid, moisture, impacts and external effects
• Heat transfer: The thin metal wall conducts the ambient temperature to the sensor
• Surface: Polished surface resistant to oxidation and rust
• Durability: The strong metal body protects the sensor against impacts
• Ready-made probe compatibility: 6x50mm body size used in many waterproof DS18B20 probes on the market
• Options: 4x50mm, 5x30mm, 6x30mm, 6x100mm, 6x120mm, 8x50mm and 8x100mm steel sensor heads are sold separately
• Operating temperature: The sheath itself withstands high temperatures; the usable range is set by the sensor, cable and epoxy inside (-55°C - +125°C for DS18B20)
• Shape: Cylindrical tube
• Material: Stainless steel
• Color: Grey (metal)
• Inner diameter: approximately 5mm; TO-92 package sensors fit, but tightly
• Dimensions: 6mm x 50mm (outer diameter x length)
• Weight: approximately 2.5gr

Usage information:

• Solder the cable to the sensor legs and insulate each leg with separate sleeving or heat shrink tubing; the metal sheath is conductive, and a bare leg touching it causes a short circuit.
• Push the sensor all the way to the closed end of the sheath with its sensing tip first. Fill the gap with epoxy (with thermal paste if better heat transfer is needed) and seal the open end with epoxy and heat shrink tubing.
• Place the finished probe with its closed end in the liquid or environment to be measured; since the sensor sits at the bottom of the sheath, the temperature is read through the thin metal wall at the closed end, and the open end where the cable exits can stay outside.

Applications:

•  Aquarium water temperature measurement and heater control
•  Incubator temperature control
•  Greenhouse and soil temperature measurement
•  Fridge, freezer and cold room temperature monitoring
•  Pool water temperature measurement
•  Boiler, hot water tank and solar water heater
•  Radiator and combi boiler pipe temperature monitoring
•  Beer and yogurt fermentation temperature control
•  Thermostat and temperature controller board projects
•  Building waterproof temperature probes with Arduino and ESP32
   

Precautions:

•  The sheath alone is not waterproof. Before using it in liquid, seal the open end completely with epoxy and heat shrink tubing.
•  The metal sheath conducts electricity. Do not insert the sensor before insulating its legs and solder joints.
•  The usable temperature is set not by the sheath but by the sensor, cable insulation and epoxy inside. Do not exceed the temperature limits of these materials.
•  The inner diameter is approximately 5mm. Sensors with a body larger than TO-92 will not fit; check the sensor size in advance.
•  The sheath and filling material add thermal mass; the sensor responds to temperature changes somewhat more slowly than a bare sensor.
•  The steel grade (such as 304 or 316) is not specified. Salt water (marine aquarium) and chlorinated pool water can cause pitting corrosion of stainless steel over time; check the sheath regularly in these environments.
•  Suitability of the sheath and the epoxy filling for contact with food and drinking water is not documented. In food applications such as fermentation, do not immerse the probe directly in the food.

Package contents:

•  1 Piece Steel Sensor Head 6x50mm
•  Note: Temperature sensor, cable, epoxy and heat shrink tubing are not included in the package.