Before you begin
Figure 1. Duct Probe Humidity Element
| Number | Description |
|---|---|
| 1 | Housing |
| 2 | Duct |
| 3 | Nut for conduit fitting |
| 4 | Conduit hole |
| 5 | Washer |
| 6 | Conduit fitting |
| 7 | Snap-on cover |
| 8 | Conduit knockout |
| 9 | Housing |
Procedure
- Remove any excess insulation from the duct that prevents the probe from extending a minimum of 3 in. (76 mm) into the air stream.
- Use the hole saw to make a 1 in. (25.4 mm) hole in the duct to insert the probe.
- Remove the plastic cover from the housing.
- Insert the probe into the duct, and use the housing as a template to mark the location of the holes for the mounting screws.
Important: Remove the unit before drilling to prevent any metal remnants from
falling onto the circuit board.
- Remove the unit, and drill a 1/8 in. (3 mm) hole for each mounting screw.
- Use a gasket, sealer, or other means to seal the area around the 1 in. (25.4 mm) hole between the unit and the duct.
- Reinsert the probe, and secure the housing to the duct using the two No. 8 screws provided.
What to do next
Important: Seal any holes created during installation to help reduce drafts
and for more accurate humidity readings.