Style "A" Series
Most Ordinary Completely Submersible Installations
Option Available For:
- 3/4" MNPT Rear Threaded Immersion Sensors
- 6X11, 6X13, 6X12, 6X53, 6X54, 6X32 & 6X42 Series pH/ORP Sensors
- 3/4" MNPT Rear Threaded Sanitary/HOT-TAP Sensors
- 5X31, 5X41 & 5X51 pH/ORP Series Sensors
- 5XX0 Ion Selective (ISE) Series Sensors
- AST-DO-UNIVERSAL Dissolved Oxygen (DO) Series Sensors in the universal and sanitary/HOT-TAP configurations
- 1" MNPT Rear Threaded Immersion Sensors
- 6X52, 6X51, 6X31 & 6X41 Series pH/ORP Sensors
- 6XX0 Series Ion Selective (ISE) Series Sensors
- 1" MNPT Read Threaded Twist Lock Sensors with protective tines (guard) option added
- 8X52, 8X51, 8X31 & 8X41 Sensor pH/ORP Series
- 8XX0 Series Ion Selective (ISE) Series Sensors
- AST-DO-UNIVERSAL Dissolved Oxygen (DO) Series Sensors in the twist lock quick disconnect configuration
- 1-1/4" MNPT Read Threaded Immersion Sensors
- AB 6100 Fluoride Ion Selective
Features & Recommended Applications:
- Complete isolation of back end threaded fitting from liquid process and
good protection of cable from corrosion and chemical attack
- Rear threading is identical to that specified on original sensor
specifications prior to application of Waterproofing "A" Option
- Hex Head for wrench flats enable easy installations into fixtures
- Not recommended for extremely corrosive installations or installations
which do not utilizes any kind of guide rod or conduit
- Recommended primarily for elongating sensor life where attack of liquid
from back end causes death to sensor prior to chemical or physical attack through front of
- For Applications Requiring Waterproofing Assemblies to be constructed of only CPVC (for
strong oxidative or reducing solutions - i.e. chlorine, chlorine dioxide, strong hydrogen
peroxide or ozone solutions... etc.); Change Waterproofing part description from
Waterproofing "A" to "G"
BEST PRACTICE FOR INLINE USE
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.
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 transmitter where is 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. Another approach for sealing the back of the sensor if there will be significant water exposure is to add a waterproofing option. In general, for such cases just the least expensive WPIT option is which sufficient provided that tubing is properly installed. The WPIT waterproofing option has a slight surcharge for extended cable lengths. In some cases the more robust WPA option can also be used to fulfill this purpose. Unfortunately waterproofing options cannot be added once a sensor has been fabricated but rather 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 mean 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. The WPIT, WPA or WPC waterproofing options can be added if desired/required to make the sensor life better even 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 1 feet 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/waterproofing to be sealed with a mating NPT coupling and the cable run in conduit. For additional sealing option a WPA, WPC or WPB waterproofing option can be added if desired/required. There is a special surcharge if the sensor has a longer cable length that the standard 5 feet for the WPIT and WPB waterproofing options only. It is possible to use the standard immersion or twist lock sensor for submersible use without adding a waterproofing option is VERY, 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. The use of Waterproofing Option WPA, WPB or WPC is VERY STRONGLY recommended (although not strictly required) for submersible installations.
Angle view of AB 6410 Ammonium ISE sensor
with WPA submersible option installed
WPA on sensor without preamplifier
shown in 1"MNPT rear thread size
Close-up rear view of WPA submersible option
Download Line Drawing of Waterproofing "A"