HMD70U/Y Operating Manual
M210277EN-C
1
HUMIDITY TRANSMITTER HMD70U
HUMIDITY AND TEMPERATURE TRANSMITTER HMD70Y
MOUNTING
Ø 12 (0.47)
250 (9.84)
62 (2.44)
<<< Mounting hole
82 (3.23)
100 (3.94)
>
>
>
1
0
0
(
3
.9
4
)
8
2
(
3
.2
3
)
M
o
u
n
ti
n
g
h
o
le
Figure 1: Dimensions of the HMD70U/Y
The HMD70U/Y duct mounted humidity
and temperature transmitters are three-
wire transmitters. Mount the transmitter
with two screws. Place the drilling
template on the duct surface and drill the
holes as indicated. Remember to drill an
additional hole for calibration purposes.
The calibration can be conveniently
performed on site with the HMI41 or
HM70 indicator equipped with an
appropriate probe and optional
calibration cable.
GROUNDING
Open the lid and mount the cable bushing
set 18941HM. Ground the cable by
connecting the contact tongues inside the
bushing to an exposed length of cable
braid as shown in Figure 2.
To minimize
short-circuit risk, do not expose more
cable braid than is necessary for
connecting the braid to the contact
tongues.
Figure 2: Signal cable grounding
*M210277EN*
