3
Basic Operation
There are three main modes for the RL101M LEL sensor head Unit. In addition, there is an OFF
mode and a Startup mode. When the unit is powered there is a 30 second
(Startup) countdown during which some system values are displayed before going into the
Normal Operating mode. The Rl101M offers reed switches which allow unobtrusive calibration, meaning
you do not need to remove the Lid to the Rl101M. The reeds switch acts as a button with the redline
magnet. When the magnet is placed close to the reed it engages like a button, when the magnet is taken
away it disengages. Move the magnet repeatedly toward and away from the reed to change digits.
To get to the second mode this is addressing, press TEST once. To enter the third Mode, press TEST
again while in the 2nd Mode. Pressing TEST while in the 3rd Mode will get back into the 2nd mode or
addressing. Pressing MENU multiple times will get back to Normal Operating mode.
If left in any mode (except OFF), the unit will return to Normal Mode after three minutes.
When the Head unit changes modes, it will send a message to the Monitor. The display shows the ppm
in percentage, therefore 50 ppm would be would be displayed as 2.5 % (5%=100ppm) *
Before use
allow 10 minutes for sensor warm up
.*
Up and down buttons
Menu Reed Switch
Test Reed Switch
4 socket connecter from
LEL sensor housing
9VDC IN
XBEE 2.4G
