Vaisala HMT370EX Serie Manual Del Usuario página 19

3. Prepare the cabling wires as required in your application (cabling either through 1 or 2
lead-throughs).
a. Strip the cable wires: it is recommended to attach ferrules to the contact ends of the
wires.
b. Open the cable gland and insert a suitable length of the cable inside the transmitter
through the cable gland.
c. Tighten the cable gland: refer to the instructions of the glands used in your
application for maximum tightness.
d. If your installation does not require using both lead-throughs, plug the unused lead-
through with an Ex compliant seal.
4. Connect the screw terminal wiring as required in your application. For protected
installation wiring diagrams, see
Zener barriers (page
a. Open the cable fastening clamps below the screw terminals and lead the cables to the
terminals through the clamps.
b. Connect the wires to the screw terminals.
Note that Channel 1 (CH1) must always be wired. The transmitter receives
power through the CH1 screw terminals, and does not power on if only
Channel 2 (CH2) is wired.
c. Adjust the length of the wires and close the cable fastening clamps so that they hold
the cables in place.
Optional: For instructions on testing the analog output level with a multimeter, see
5. Close the transmitter body cover and tighten the captive screws, and then attach the
probe body to the transmitter.
It is sufficient to tighten the probe body to finger tightness with the locking
wheel. To prevent detaching the probe body without tools, you can tighten
the locking wheel further with an Allen key (5 mm).
6. Mount the probe head to the area you want to measure in.
HMT370EX Series probes are designed for a variety of applications with
different installation requirements. For probe-specific installation
instructions, see HMT370EX User Guide.
7. Connect the grounding terminal on the bottom of the transmitter to the grounding
element of the installation site with a 4 mm
transmitter, switch on the power supply input.
Wiring with galvanic isolators (page 17)
18).
2
Chapter – Installation and wiring
grounding wire. After grounding the
and Wiring with
step 8.
15