Vaisala LT31 - Double-Checking Transmitter Alignment; Figure 88 Measurement Unit Leds

Chapter 4 _______________________________________________________________ Installation
VAISALA ______________________________________________________________________ 131
The LEDs behind the right window of the measurement units of LT31
transmitter and receiver must flash. See Figure 88 below.
0401-123
Figure 88 Measurement Unit LEDs
At transmitter location, the white transmitter light must be observable
through the left window.
WARNING
LASER class 1 product; do not stare directly into the bright light beam.
Double-checking Transmitter Alignment
1. Place the ladder behind the receiver mast.
2. The main bright transmitter light beam must be observable in the
area of the receiver head.
3. Should the transmitter light not be visible, the transmitter has to be
realigned.
4. Check if the transmitter head has to be turned or tilted and in which
direction.
5. Go back to the transmitter location and correct the alignment
accordingly.
6. Do not forget to tighten all the fastening screws carefully.
If all parts seem to be operational, you can continue from section Startup
Procedure on page 132.