Direction Of The Sensor Antenna - ABB Excount II User Manual

4. Using the transceiver

4.8 Direction of the sensor antenna

It may seem logical to be as close as possible to the sensor to obtain the
highest signal strength. However, this is not the case since the sensor
antenna has a signal direction which is nearly horizontal, see figure
4.8.1 depicting the contact zone.
To achieve the highest signal strength, you should stand a distance
away which is equivalent to twice the height of the sensor above the
ground plane. As noted in section 4.7, facing almost 90° degrees to
the sensor will also assist in optimizing the signal strength.
Sensor
Height
2 x Height
Figure 4.8.1
Optimal direction of the sensor antenna
Since EXCOUNT-II relies on radio communication to make contact
between the transceiver and sensor, so called "dead zones" can exist,
whereby the location you are standing at does not permit adequate
signal strength. If a measurement is attempted in one of these zones,
an Error code 80 or 82 may appear on the transceiver. Taking a few
paces to move out of the "dead zone" before retransmitting again is
often all that is needed to permit contact to be established between
the transceiver and sensor.
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1HSA 801 080-15en EXCOUNT-II Users Manual