Vaisala HMD70U Operating Manual

HUMIDITY TRANSMITTER HMD70U
HUMIDITY AND TEMPERATURE TRANSMITTER HMD70Y
MOUNTING
62 (2.44) 250 (9.84)
Ø 12 (0.47)
Figure 1: Dimensions of the HMD70U/Y
GROUNDING
Figure 2: Signal cable grounding
HMD70U/Y Operating Manual
100 (3.94)
<<< Mounting hole
82 (3.23)
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.
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.
short-circuit risk, do not expose more
cable braid than
connecting the braid to the contact
tongues.
*M210277EN*
M210277EN-C
To minimize
is necessary for
1