Mechanical Installation - Vaisala MHT410 Guía Rápida

Mechanical Installation

Before you install the transmitter, make sure there is no negative
pressure in the transformer. If there is negative pressure when
you open the bleed screw during installation, air will flow into the
transformer oil tank.
The following steps refer to the numbered illustrations on the front foldout pages.
1. Remove the protective cap with sorbent packet from the mounting nut.
In case of rain, do not let any water fall on the filter.
2. Apply PTFE tape tightly on the mounting nut threads.
Before you start, clean the threads with a cloth.
o
Start wrapping from the third thread on the tip of the mounting nut, and
o
apply a few loops inwards.
Wrap the tape in the opposite direction to the tightening direction of the
o
nut. In other words, wrap the tape along the threads. See the image in
the front foldout page for the correct direction.
Wrap each loop about half way on top of the previous loop so that the
o
loops overlap.
3. Fasten the mounting nut on the ball valve with your hand. Then tighten the
mounting nut with a wrench. Leave the bleed screw directly on top of the
nut.
Always make sure the bleed screw is closed before you turn
the mounting nut with a wrench.
4. With a 3 mm Allen key, loosen the bleed screw. Place a bucket under the
mounting nut.
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