Operating Of The Instrument; Power Supply - SARAD RTM 1688-2 Manual

RTM 1688-2

Operating of the Instrument

Fig. 1: operation elements and connections
A Display
B USB interface
C Operation button (Toggle)
D Light
E Connection water inlet protection

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 be recharged as long as the AC/DC adapter is connected, the red
LED on the "LIGHT" button turns on, after a while the LED " TOGGLE" is lighting, but it takes
about 8 hours for full charging in case of a totally discharged battery.
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 in the stand by status.
6
F External power supply
G RS 232 interface
H Air inlet
I Air outlet
J Dust filter
Manual_RTM1688-2_EN_24-02-2023.docx
 SARAD GmbH 2023