Vaisala RS92-D Guide de l'utilisateur télécharger pdf (Page 20)

User's Guide ______________________________________________________________________

18 __________________________________________________________________ M210987EN-C

Optional Sounding Accessories

The RS92 unwinder RSU911 is designed to be attached directly to the

folded balloon neck. However, you can use the same unwinder if you

use optional sounding accessories, such as a parachute or a radar

reflector.

Always attach the unwinder to a relatively firm support, such as the

balloon or the parachute spreader. The support must not let the

unwinder twist freely, or otherwise the suspension string might unwind

at too high a speed and the radiosonde hit the ground during the launch.

The unwinder must also be able to swing slightly during the sounding.

Attach all optional sounding accessories next to the balloon, or

otherwise they disturb the measuring environment of the radiosonde

and no proper temperature and humidity measurements can be made.

Totex Parachute 5710-5

The recommended parachute is the Totex type 5710-5 (Vaisala code

15046). In the Totex parachute, an elastic ribbon loop hangs the

unwinder securely under the spreader.

Attach the parachute directly to the balloon with the parachute string.

NOTE

When using a balloon with an integrated parachute, make sure that a

sufficiently long piece of the parachute string is poking out of the

balloon neck in order to fasten the string to the radiosonde unwinder.

CAUTION

The strength of all the strings used during soundings must exceed 25

kp (250 N). Knots in the strings weaken the strength to the minimum

of 40 % of the original string strength. This results in a string strength

of 10 kp (100 N), which is sufficient for RS92 soundings.

Table 3 Ordering Codes for Optional Sounding Accessories

Item Code Note

Totex parachute 15046

Rubber plate RS46158 Used with a radar reflector

Hanger board RS46157 Used with a non-Totex parachute

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 45 46

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Vaisala RS92-D Guide de l'utilisateur Page 20