The Turtle Tough extreme waterproofing solution is suitable for the most aggressive agitated slurries and corrosive solutions. This waterproofing is also recommended for installations where the sensor is installed directly into the process without an immersion rod or conduit. This is ideal for our drop-tube applications as the cable is completely isolated with the option of Vinyl or Norprene tubing. WATERPROOFING REQUIREMENTS – BEST PRACTICE FOR INLINE USE INDOOR If a standard sensor such as the immersion or twist lock sensor series is used for inline installations and no immersion or submersible use is planned then no special precautions are required if it is for indoor use. This assumes that the back of the sensor will not be exposed to corrosive gas present and/or the plant will not cause any process media to get onto the back of the sensor, nor give it significant water exposure by washing down the area. OUTDOOR If a standard sensor such as an immersion or twist lock sensor series is used for inline installations and no immersion or submersible use is planned then there generally ARE special precautions required for outdoor inline use. The most common is to seal the back end of the sensor in conduit to isolate the back end of the sensor. The most common approach so to use sufficient TEFLON tape and a NPT coupling to create this back sensor seal, and then either a rigid or flexible conduit back to the analyser where the lead wires are terminated for cable isolation. This creates a barrier that makes the sensor suitable for conditions were rain and other outdoor elements could damage the seal on the back of the sensor. Specifically, this can prevent water from attacking along the sensor cable and causing internal shorting to solder joins inside the unit itself. Alternatively, Turtle Tough recommends adding one of our waterproofing options to seal the back of the sensor if there will be significant exposure to water. In general, for such cases just the standard waterproofing is sufficient. Please note that waterproofing options cannot be added once a sensor has been fabricated. It must be installed at the time of manufacture. BEST PRACTICE FOR IMMERSION USE Immersion use is defined as when the sensor is immersed into the process media, but the entire sensor is not submersed. This means that the back of the sensor is NOT completely below the process media level. Immersion installations always require the back of the sensor/waterproofing to be sealed with a mating FNPT coupling and the cable run in conduit. Waterproofing options can be added if required to extend sensor life for such immersion installations. It is possible to use the standard immersion or twist lock sensor for immersion use without adding a waterproofing option if VERY GOOD care is taken to seal the back of the sensor with a coupling and properly running the cable in conduit back to the transmitter. BEST PRACTICE FOR FULLY SUBMERSIBLE USE Submersible use is defined as when the sensor is COMPLETELY immersed into the process media (anywhere from 30cm below the fluid level to much much deeper). In this case the entire sensor is submersed. This mean that the back of the sensor is COMPLETELY below the process media level. Submersible installations always require the back of the sensor to be sealed with an appropriate waterproofing option. At a minimum the sensor must be sealed with a mating NPT coupling and the cable run in conduit. For additional sealing Standard or Extreme Waterproofing option can be added. It is possible to use the standard immersion or twist lock sensor for submersible use without adding a waterproofing option providing that extreme care is taken to seal the back of the sensor with a coupling and properly running the cable in conduit back to the analyser. Please Note: The use of Waterproofing Standard or Extreme Waterproofing Option is STRONGLY recommended for submersible installations.