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SARAD GmbH
RTM1688-2 GEO Version
The RTM188-2 GEO is a special version of the RTM1688-2. The control
panel of the unit, the battery and an optional modem have been
integrated into a sealed enclosure (IP68 protected). The Radon
measurement chamber, sensors for temperature and humidity as well
as the tilt detector are placed into a separate soil gas probe. The probe
is connected to the main unit by a single cable with a maximum length
of 10 Meters.
The operation of the instrument is equal to the standard version.
Power Supply
polarity of the battery terminals! A wrong polarity will definitely damage the instrument!
If the capacity of the original battery is too less, a larger 12 V lead acid battery can be
connected to the external power socket. In this case it is strictly required to remove the
internal battery firstly. Please check the right pin assignments of the connectors
The battery can be charged using the charge circuit of the control panel. Thus, the "CHARGE"
socket of the control panel and the external power socket are connected by a cable with a
plug on the panel side. It is recommended to use a separate powerful charger if using a
battery with a high capacity because the charge current of the internal charge circuit is
limited to approximately 500 mA. The external voltage of 15 to 18 VDC may be applied
permanently. Then, the internal battery works as a buffer in case of a power interruption.
Optional GSM Modem
The GSM modem is attached to the chassis below the battery. A special data cable enables
the communication between the instrument and the modem. The cable have to be
connected to the "SERIAL" socked of the control panel and to the 9-pin SUB-D socked of the
modem.
The antenna is connected to the coaxial (SMA) terminal at the opposite panel of the modem.
A short adapter cable is used to match the SMA standard to the standard antenna
connector. The screwed cable gland beside the power connector allows the user to draw the
User Manual RTM1688-2 06-02-2019.docx
The 12 V / 12 Ah Lead-Gel battery is placed below the control panel.
The battery life time is approximately 2000 hours under normal
environmental conditions. Low temperatures or ageing will reduce
considerably the battery capacity. Only a few handles are necessary
to replace a discharged battery by a new one on site. For that, open
the enclosure and remove the cable sockets from the battery.
Loosen the nuts of the mounting rail and remove the rail. Pull out
the battery onwards. To insert a new battery follow those
instructions in reversed order. ATTENTION: Take care for the right
12
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