T
ECHNICAL
R
EFERENCE
M
ANUAL
Distance Laser Sensor
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1.4 Measurement range
The MRL3 (H) is an optical instrument, whose operation is influenced by environmental conditions. Therefore, the
measurement range achieved in the application can vary. The following conditions may influence the measurement
range:
Key
Factors increasing range
Factors reducing range
Target surface
Bright and reflecting surfaces such as the target
plates (See 9 Accessories on page 35)
Matt and dark surfaces
Green and blue surfaces
Airborne particles
Clean air
Dust, fog, heavy rainfall, heavy snowfall
Sunshine
Darkness
Bright sunshine at target
The MRL3 (H) does not compensate the influence of atmospheric environment, which may be relevant when measuring
long distances (e.g. > 150m). These effects are described in:
B.Edlen: “
The Refractive Index of Air, Metrologia 2
”, 71
-80 (1966
)
1.5 Prevention of erroneous measurements
1.5.1 Rough surfaces
On a rough surface (e.g. coarse plaster), measure against the center of the illuminated area. To avoid
measuring to the bottom of plaster joints use a target plate (see accessories) or board.
1.5.2 Transparent surfaces
To avoid measuring errors, do not measure towards transparent surfaces such as colorless liquids (such as water) or
(dust free) glass. For unfamiliar materials and liquids, always take a trial measurement.
Erroneous measurements can occur when aiming through panes of glass,
or if there are several objects in the line of sight.
1.5.3 Wet, smooth, or high-gloss surfaces
1
Aiming at an “acute“
angle deflects the laser beam. The MRL3 (H) may receive a signal that is
too weak (error message 255) or it may measure the distance targeted by the deflected laser beam.
2 If aiming at a right angle, the MRL3 (H) may receive a signal that is too strong (error message 256).
1.5.4 Inclined, round surfaces
Measurement is possible as long as there is enough target surface area for the laser spot.
1.5.5 Multiple reflections
Erroneous measurements can occur in the case that the laser beam is reflected from other objects than the
target. Avoid any reflecting object along the measurement path.
2 Device setup
We recommend performing the configuration steps in an office before mounting the device, especially if you
are not familiar with the MRL3 (H).
