Bosch PTD 1 Original Instructions Manual page 14

14 | English
The central laser point marks the centre of the measuring
surface. For an optimum measurement reading, position the
measuring tool so that the laser beam meets the measuring
surface perpendicularly to this point.
Do not direct the laser beam at persons or animals and
u
do not stare into the laser beam yourself (even from a
distance).
Increasing the distance between the measuring tool and the
measuring object increases the size of the laser circle and
therefore the size of the measuring surface. The optimum
measuring distance is 0.5 to 1 m.
Do not hold the measuring tool directly against hot
u
surfaces. The heat can damage the measuring tool.
The displayed reading is the average value of all temperat-
ures measured within the measuring surface.
Information about the measuring conditions
Highly reflective, shiny or transparent surfaces (e.g. high-
gloss tiles, stainless steel cupboard fronts or saucepans)
may impair the surface temperature reading. If necessary,
mask the area to be measured with a dark, matt adhesive
tape that conducts heat well. Allow the tape to acclimatise
briefly on the surface.
It is not technically possible to perform measurements
through transparent materials.
Consequently, the more suitable and stable the measuring
conditions are, the more accurate and reliable the results of
the measurement will be.
The humidity and ambient temperature sensor (1) can be
damaged by chemical contaminants, such as paint or varnish
vapours. Infrared temperature measurement is impaired by
smoke, vapour or dusty air.
It is therefore important to ventilate the room prior to meas-
uring, especially when the air is contaminated or steamy. For
example, do not perform measurements in a bathroom im-
mediately after the shower has been used.
Once ventilated, allow the room to reacclimatise a while until
it returns to the usual temperature.
The ambient temperature and relative humidity are meas-
ured directly on the measuring tool at the humidity and am-
bient temperature sensor (1). To achieve meaningful res-
ults, do not hold the measuring tool directly over or next to
sources of interference such as radiators or open liquids. Do
not cover the sensor (1) under any circumstances.
Measuring functions
Individual measurements
Briefly pressing the measuring button (4) once switches the
laser on and actuates a single measurement in the selected
mode. The measuring procedure can take one to two
seconds and is indicated through rotating display segments
in line (l).
Upon completion of the measurement, the laser switches off
automatically.
The most recent measurement readings are shown on the
display. In addition, the HOLD indicator (m) flashes. The in-
dicator LED remains unchanged for the last display.
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Continuous measurement
Press and hold the measuring button (4) to perform continu-
ous measurements in the selected mode. The laser remains
switched on. Using slow movements, aim the laser circle at
each of the surfaces to be measured, one by one. Move the
measuring tool slowly in the room to perform humidity and
ambient temperature measurements.
The indication on the display and the indicator LED (8) are
continually updated. As soon as you let go of the measuring
button (4), the measurement is stopped and the laser is
switched off.
The most recent measurement readings are shown on the
display. In addition, the HOLD indicator (m) flashes. The in-
dicator LED remains unchanged for the last display.
Surface temperature mode (see figure A)
The surface temperature of a measuring object is measured
using the surface temperature mode.
Press the surface temperature
mode button (11) to select the
surface temperature mode. The
indicator (k) appears in the dis-
play for confirmation.
Press the measuring button (4) and aim the laser circle so
that it is perpendicular to the centre of the measuring object.
Once the measurement is complete, the measured surface
temperature is displayed in line (l).
The indicator LED (8) does not light up in surface temperat-
ure mode.
You can use this mode to measure the temperature of radiat-
ors, underfloor heating or fridge interiors, for example.
Thermal bridge mode (see figure B)
In thermal bridge mode, the surface and ambient temperat-
ures are measured and compared with each other. If there is
a significant difference between the two temperatures, the
tool issues a thermal bridge warning (see "Thermal bridge",
page 16).
Press the thermal bridge mode
button (10) to select the
thermal bridge mode. The
indicator (j) appears in the dis-
play for confirmation.
Press the measuring button (4) and aim the laser circle so
that it is perpendicular to the centre of the measuring object.
Once the measurement is complete, the measured surface
temperature is displayed in line (l) and the measured ambi-
ent temperature in line (a).
The measuring tool automatically compares the values and
interprets the result as follows:
– Green indicator LED (8): Low temperature difference, no
thermal bridges present.
– Yellow indicator LED (8): Temperature difference near
the limit value, a thermal bridge may be present in the
measuring area; if necessary, repeat the measurement at
a later point in time.
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