Trotec PD200 Operating Manual page 8

Schematic cross-section cold roof
N Roof trim
F Roof seal
P Roof beam
G Thermal insulation
R Ceiling boarding
T Roof trim
Installation of loop wiring
Schematic cross-section warm roof
B Loop wiring
Schematic cross-section greened roof
B Loop wiring
8
N
E
F
O
P
Q
G
H
R
S
T
E Gravel fill
O Roof boarding
Q Timber rafter
H Vapour barrier
S Wall
B
U
U Fill
B
U
U Fill
pulse current measuring system PD200
Before measuring, the bare loop wiring (4) is to be laid as closed
circuit around the roof area to be examined observing a
minimum distance of 0.5 m to the roof edge. Current can only
flow when the wire is placed directly on the roof seal. If the fill
consists of gravel or other granulated material, we recommend
using the gravel claw as optional accessory. In case of thicker
coatings, e.g. soil or greening, the roof seal has to be exposed
to enable direct contact of loop wiring and roof seal.
At any rate, the roof seal to be checked must be sufficiently
damp to conduct the current pulses. The roof seal may have to
be watered additionally.
EN