Microtronics myDatalogNANO Ex, User Manual

Page: 49 / 111

Chapter 7 Installation
7.4.3.2 Possibilities for improving the signal quality
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Drill a duct for the antenna into the concrete ring on the shaft to bypass the steel cover
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Insert the antenna extension in an existing ventilation or supply pipe
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Use special types of antennas (please note: The use of antennas that are not approved by the
manufacturer with devices that are Ex approved will render this approval invalid)
7.4.3.3 Procedure for determining the optimum position of the antenna
1. Install the myDatalogNANO Ex as described in chapter "Installing the myDatalogNANO Ex " on
page 39. During this process, also observe the notes regarding the influences on the signal
quality (see "Typical influences on the signal quality" on page 48).
2. Initiate ALOHA transmission mode (see "ALOHA transmission mode" on page 34).
3. Wait until it is indicated in the list of measurement instruments that the device is in ALOHA
transmission mode. This is indicated by a speech bubble with the "Aloha" inscription.
4. Check the incoming data in the ALOHA data window of the myDatanet server, which can be
accessed by clicking on the speech bubble with the "Aloha" inscription (see "myDatanet
Server Manual " 805002). Particular attention must be paid to the internal"GSM level"
measurement value. Change the position of the antenna to obtain the best possible signal
quality.
Note: A security stock of 15dBm is highly recommended.
Note: Additional explanation about evaluating the "GSM level":
"GSM level"
>-64dBm
-64 to -73dBm
-74 to -83dBm
-84 to -93dBm
-94 to -107dBm
<= -108dBm
7.4.4 Technical details about the universal inputs
Note: The universal inputs are not galvanically isolated.
Rev. 01 49