2
T
RUE
RH Series HT-670x Humidity Transmitters Installation Instructions
Mounting
Location Considerations
IMPORTANT:
To avoid damage to the circuit
board and components, do not mount the unit in a
location where high concentrations of corrosive
vapors are present.
The HT-670x element comes with one mounting base
for both surface and wallbox mounting. To mount the
HT-670x, release the cover from the mounting base as
described in Figure 1.
Base
Cover
1. Loosen (do not
remove) the cover
screw with a 1/16 in.
(1.5 mm) Allen
wrench.
2. Swing the cover
down from the
base.
Figure 1: Removing the Cover from the Base
Wallbox Mounting: Special Tools Needed
Use a 1/16 in. (1.5 mm) Allen wrench or T-4000-119
Allen-head adjustment tool for mounting.
Wallbox Mounting: Location Considerations
Locate the humidity transmitter on an inside wall, free
from drafts, and out of direct sunlight. The HT-670x is
shock and vibration resistant; however, be careful not
to drop or mount the unit where it could be exposed to
excessive vibration. The following ambient operating
conditions apply:
•
Temperature: 32 to 122°F (0 to 50°C)
•
Humidity: 0 to 100% Relative Humidity (RH),
noncondensing; 85°F (29°C) maximum dew point
To mount the HT-670x to a wallbox:
1. Pull the cable or wiring through the wallbox and
base.
2. Rotate the mounting base, so one of the arrows on
the base points up.
3. Fasten the base to the wallbox with the
No. 6 screws provided. (See Figure 2.)
Note:
These instructions assume a standard
2 x 4 in. (52 x 104 mm) U.S. wallbox is used.
No. 6
Screws
Cover
Screw
Figure 2: Wallbox Mounting
Place the bottom edge of
the cover against the bottom lip of the base, and
rotate it up onto the base. (See Figure 3.)
5.
Tighten the cover screw.
Base
Cover
Screw
Cover
Figure 3: Attaching the Cover to the Base
Once installed, the HT-670x cannot be removed from
the wall unless the cover screw is loosened as
described in Figure 1.
IMPORTANT:
Seal the drilled hole or use an
ACC-INSL-0 Foam Pad Kit to help reduce drafts
entering the unit. (See Table 1.) Drafts could result
in false humidity or temperature readings.