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SARAD GmbH
Operating the Instrument
Power supply
Please insert the fuse at the backside of the instrument before using the instrument. The
instrument has no power switch because the power consumption of the electronic circuits is
less than the self-discharge of the battery. After inserting the fuse the instrument enters the
stand by status, the display will show "RTM 1688 SN:XXXXX". It is necessary to set the real
time clock of the instrument in that case (see manual "Radon Vision")
To maximise the capacitance and battery life time, the battery should be charged from time
to time (each 3 month) even if the instrument is not in use. Otherwise the battery may
become discharged deeply which can cause malfunction of the internal microprocessor.
Remove the fuse if battery maintenance is not guaranteed over long periods.
The instrument is powered either by the internal 12V/3.2Ah lead gel battery or by the AC/DC
wall adapter included in delivery. The battery allows an autonomous operation for more
than 24 hours. The battery will recharged as long as the AC/DC adapter is connected, the red
LED on the "TOGGLE" button turns on. It takes about 8 hours for full charging in case of a
totally discharged battery. The end of the charging process will be indicated by a lighting LED
on the "LIGHT" button.
If the battery voltage drops below 11.8V, the display will show the phrase "LOW BATTERY!"
after finishing each integration interval. The measurement is still continued for several
hours. The pressing of the "TOGGLE" button leads back to the standard display output. If the
battery voltage decreases down to 11.2V the running sample will be stopped and the
instrument enters the stand by status.
Input Filter
The instrument is equipped with a high efficient multi-stage filter to prevent penetration of
daughter products into the measurement chamber. This filter will be protected against
contamination by an additional syringe filter fitted to the air inlet. Do not use the instrument
without that filter and replace it if required (becomes dark if loaded with dust). Take care for
the correct flow direction. Some filters can block the air flow completely when used in wrong
flow direction.
Carrying out a measurement
Press the push button to start a new measurement series. The pump starts and the display
will show the remaining time to complete the first integration interval.
The actual status and set-up information (see below) may be displayed by pressing the
button again.
User Manual RTM1688-2 06-02-2019.docx
RTM1688 SN:00001
Wait 120 Minutes
for first data!
5
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