Method of testing
The test procedure is performed within a
test area, created with stainless steel wire,
which must be in good contact with the
wet surface. If necessary, weights or
adhesive tape should be used to hold the
wire in position and the ends of the wire
must be clipped together to form a
closed circuit (ring). Any areas which
protrude from the roof must be screened
off by using an additional loop of wire,
which in turn must be connected to
the main border.
Test electrodes are supplied in three parts
which can be put together easily on site
to form two probes (poles). These are
connected to the small detector unit
with the red and black leads supplied.
A suitable mechanically-fixed earthing
point should be located on the building.
Using the crocodile clip, the 10-metre
lead (with red plug) should be securely
attached to the earth point whilst the
other end is connected into the positive
(red) socket on the right- h a n d side of
the generator unit. The black plug on the
other connecting lead should be fitted
into the negative (black) socket on the
generator unit with the crocodile clip
attached to the trace wire. The clip must be positioned to clamp together the free end of the trace wire
to the section of wire emerging from the reel to complete the loop around the test area. The
generator unit should now be switched on.
When the detector unit is switched on the unit will self-calibrate ― it is important that the probes are not in
contact with the test area at this point. The red probe should be held in the right hand and the black in
the left, making sure that the leads do not cross over. Inside the test area, the probes should be positioned a
distance apart either side of the body in contact with the wet roof. When the generator pulses the bar
graph on the detector unit will show the direction of the fault. Starting at the edge of the screened
area, re-positioning the probes and watching the detector will locate the direction of the fault (right or left).
The search is continued in the direction of the pulse until the reading swings the opposite way. At this point, if
the operator turns 90 degrees and repeats the procedure a crossover point can be reached to locate
the source of the leak.
Wet Roof Pro’ (Ref: WRP01)
comprises:
• Generator unit • Detector unit
• 10m earth lead • 10m boundary connection lead
• 2 x multi-section test probes • 200m stainless steel boundary wire on a reel
• Red and black test probe connecting leads • Batteries and battery charger included
• Black carrying bag for generator unit • Adjustable neck strap for detector unit
• Comprehensive instruction manual • Complete in robust carry case
