Microtronics myDatalogNANOamr, User Manual

Page: 37 / 125

Chapter 7 Installation
7.4.3.2 Possibilities for improving the signal quality
l
Drill a duct for the antenna into the concrete ring on the shaft to bypass the steel cover
l
Insert the antenna extension in an existing ventilation or supply pipe
l
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 myDatalogNANOamr as described in chapter "Installing the myDatalogNANOamr "
on page 27. During this process, also observe the notes regarding the influences on the signal
quality (see "Influences on the signal quality" on page 36).
Note: Have a Extension cable for Antenna 900 FME (206.805) at your disposal just in case.
2. Initiate ALOHA transmission mode (see "ALOHA transmission mode" on page 23).
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 internal "GSM level" measurement value in the incoming data in the ALOHA data
window of the myDataweb server, which can be accessed by clicking on the speech bubble
with the "Aloha" inscription (see "myDatanet Server Manual" 805002). 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 meter inputs
4 inputs are available to which a meter contact can be connected without an additional energy
supply. To save energy, the output voltage U
out
is applied to the internal resistor R
i
at a sample
Rev. 01 37