All outside applications and areas where contamination is common. They should also be used in areas where blower motors or fans are in use in the area where the oiler is to be mounted.
Because the uni-directional vent only vents air as a result of the pressure build up within the bearing housing, it is creating an atmospheric condition that is different from that in and about the constant level oiler. The same concept holds true for the expansion chamber. The diaphragm in the expansion chamber is taking up the expanding air in the bearing housing, however, this air is contained and is creating a different atmospheric condition in the bearing housing from that at the constant level oiler. In these situations, a good easy conversion for the customer is to use either the closed system Opto-Matic or Watchdog oilers. These can be used with the uni-directional vents and/or expansion chambers because they are vented to the bearing housing.
The closed system Opto-Mtic oilers have an adjustment range from 9/32" to 1-1/32" inches above the centerline of the mounting hole. Because it is a combination viewport and constant level oiler, the Watchdog oiler must be mounted on the centerline of the oil level to be maintained. For this reason, it is not adjustable.