The HMT370EX transmitter body has two
M20x1.5 lead-throughs that can be fitted with cable glands, conduit fittings, and plugs, as
required by your application. By default, the transmitter comes delivered with 2 different
plug types on the transmitter lead-throughs as shown in Figure 1.
The plastic transport cover (1) must always be replaced with an Ex compliant cable
gland, conduit, or seal when wiring HTM370EX. The metal sealing plug (2) can be left
in place and used in the final installation, if the right-hand lead-through is not used.
Cable glands, conduits, and plugs are
available from Vaisala as accessories (listed in Table 1).
Table 1. Cable lead-through
Vaisala item code
Cable gland M20 x 1.5 for Ø 5 … 11 mm cable
Cable gland M20 x 1.5 for Ø 10 … 14 mm cable
Conduit fitting M16
Conduit fitting NPT1/2"
Dummy plug (Ex, 2 pcs)
CAUTION If you use
lead-through accessories not ordered from Vaisala, note the following requirements:
The cable glands and cables used for
wiring the device must not impair the Ex protection.
Unused lead-throughs must be sealed
using Ex compliant plugs.
The glands and plugs must be water
and dust tight (minimum IP rating: IP54).