User's Guide

Installation & User Guide
Bleeding the DGA-LT1 Monitor
Warning! To prevent atmospheric air from entering the transformer, there must be positive oil pressure to install
and bleed the DGA-LT1 monitor. Check the headspace pressure gauge to make sure that it is zero or positive.
1. Place an absorbent pad below the monitor to collect oil drips during bleeding.
2. Unscrew and remove bleed valve cap (blue box in Figure 20)
Figure 20: DGA-LT1 Bleed Cap
3. Install ¼" (6.5mm) inner diameter Tygon tubing over the bleed port threads (provided with the unit).
NOTE: The following is a suggested procedure that provides a visual reference indicating bleeding of the
system. Other methods can be employed but vacuum (e.g., pump or syringe) should not be used to pull oil
through the sensor as this may disrupt seals in the sensor)
4. Insert the other end of the Tygon tubing into an oil compatible container (all the way to the bottom) to
collect transformer oil. See Figure 21 below.
a. Note: Some (about 1 inch or 2 cm) compatible transformer oil in the container will help in two
ways.
i. If there is negative oil pressure, oil will be pulled up the tube, limiting amount of air
introduced into the transformer (in the event of a defective headspace pressure guage).
ii. Oil will siphon into the container when bleed tube is removed, making cleanup easier.