PFT levelling pin / Safety, overview, operation and service
Operation
4.3.4
Transferring the reference level
1
2
100 c
m
Figure 6: Marking square
When the PFT levelling pin is ready to measure, the liquid levels
are always the same in the base tank on the basic device and in the
measuring tube of the probe (principle of communicating tubes).
By raising or lowering the base tank, the liquid level is adjusted until
the level in the measuring tubes in the probe is at 0 = 100 on the
scale.
This height can be transferred anywhere - reference level.
If a reference level marker is specified, the scale line 0 = 100 probe is
held on the specified height marker. The location of the basic device
and the set height of the measuring liquid tank on it is always the
starting point of every measurement and must remain fixed during
every measurement cycle.
Reference levels can be transferred easily and reliably by means of a
marking square (2) that can be attached to the housing (1).
4.3.5
Levelling the unfinished floor
1. Bring the base tank to approx. the same height by moving the base
top part with the probe.
2. Open the shut-off valves of the base tank at the top and bottom.
3. Open self-closing valve.
4. Set the liquid column to a "round" number, preferably 0 = 100, by
moving the top part of the basic device and make a note of this.
5. Insert the marking square at the height of the reference level on the
measuring scale housing.
NOTE
Highest measured point of the unfinished floor is the
lowest reading on the scale. Lowest measured point of the
unfinished floor is the highest reading on the scale.
Unevenness:
The difference between the highest and lowest number
(e.g. lowest measured point is 4 cm to highest measured
point is 5 cm).
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