Back Pressure Transducer Check

Back Pressure Transducer Testing:

1. Plug one vacuum port.
2. Connect vacuum pump to the other vacuum port.
3. Connect 24" clear tubing to the exhaust gas port.
4. While holding clear tubing as shown in diagram, fill a portion of the tubing with water so that the level of water in the open end is approximately 3" higher than the level in the side connected to the valve (distance "A" in diagram.) Be sure there is an air space in the closed end to prevent water from getting into the BPT.
5. Apply approx. 50 mmHg (2 in.Hg) vacuum with the vacuum pump. Vacuum should hold without leaking down.
6. Lower open end of tubing slowly. When distance "A" is less than approximately 2", air should be allowed into the transducer BPT (vacuum as shown on vacuum pump gauge should go to zero.)
7. Replace if defective.