Vaisala LT31 - Dowel Mounting

Chapter 4 _______________________________________________________________ Installation
VAISALA _______________________________________________________________________ 87
When casting a new foundation, use the optional foundation kit
LTMK211 that contains the necessary hardware.
It is recommended to construct an extension for the surface around the
foundation. A safe positioning of a ladder for maintenance purposes can
be assured hereby. See Figure 42 on page 86.
Dowel mounting
The optional foundation kit (LTMK111) for LT31 dowel mounting
contains the required equipment for mounting to an existing surface. The
triangle-shaped drilling template should be used to set the drilling holes
as precisely as possible. One drilling hole at each position must point
towards the opposite foundation.
NOTE
Set the foundation screws to ensure secure fixing of the equipment.
For the foundation screws, the following tools are required:
- (Torque) wrench, size 24
- Hammer, 1.5 kg
- Drilling machine/hammer drill, preferably with a stand for
perpendicular drills
- Mounting kit with LT31 drilling template
- Mandrel bar 14 mm  (HILTI tool HSD-G M16 x 65 recommended)
- Silicon rubber
- Tape measure, length min. 30 m
Proceed as follows:
1. Orientate the drilling template in such a manner, that one of the
drilling holes points exactly towards the opposite installation place.
On both foundations, the instrument should afterwards be mounted
in the center of the foundation surface. The distance between the
single holes which point towards the opposite place, must match
exactly the desired baseline length of typically 30 m. Refer to
Figure 43 on page 88. 50 m and 75 m baselines are optional. 25 m
baseline is available as a purchased option.