Vaisala LT31 - Obstruction Light LT31 OBS; Termbox-1200;Termbox-9000

User's Guide ______________________________________________________________________
62 __________________________________________________________________ M210667EN-C
The background luminance sensor is used for measuring the background
against which the pilot views the runway lights or runway markings. For
details on Background Luminance Sensor LM21, refer to LM21 User's
Guide (see section Related Manuals on page 16).
TERMBOX-1200/TERMBOX-9000
The termination box (TERMBOX) acts as the connection point and surge
protector device for AC power and signal line cables. An AC power
cable with a maximum diameter of 25 mm can be taken inside the
termination box. The connector contacts are proper for cable leads up to
10 mm
2
.
The Termbox-1200 (LT31 receiver unit) offers connection points and
surge protectors for two signal lines.
Surge protectors are available for the following signal line types:
- Leased-line modem
- RS-485
The TERMBOX -9000 (LT31 transmitter unit) offers surge protection for
the AC power only.
Obstruction Light LT31OBS
The obstruction light is equipped with a mounting clamp (see Figure 29
on page 63). The mounting clamp is mounted to the support arm of the
LT31 transmitter and receiver support unit.