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HE-69xx0NP Duct Probe Humidity Element with Temperature Sensor Installation Guide

Product name
HE-69xx0NP Series
Document type
Installation Guide
Document revision
Revision date

Before you begin

To mount the Duct Probe Humidity Element, see Figure 1 and follow Steps 1 to 7.
Figure 1. Duct Probe Humidity Element
Table 1. Duct Probe Humidity Element assembly and mounting
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


  1. Remove any excess insulation from the duct that prevents the probe from extending a minimum of 3 in. (76 mm) into the air stream.
  2. Use the hole saw to make a 1 in. (25.4 mm) hole in the duct to insert the probe.
  3. Remove the plastic cover from the housing.
  4. 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.
  1. Remove the unit, and drill a 1/8 in. (3 mm) hole for each mounting screw.
  2. 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.
  3. 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.