Vega NB-14 / User Manual
11
Revision 04 of 24 January 2022
mechanical pushbutton;
open-collector output.
The device monitors status changes on the security inputs and when the security input
triggers, the device is activated and sends an alarm message to the network. The trigger
mechanism is configured through the program "Vega NB-IoT Configurator".
For resistance monitoring the modem has two equivalent channels: A and B. Every
channel designed for measurement of two types of the resistance – pipeline insulation
resistance R
ins
and signal wire resistance R
w
. Consider the principle of device operation on the
example of channel A.
Device measures resistance according with scheme pictured above and determines
presence of defects of the pipeline insulation or the signal wire after that. Table of control
values:
Object state
Values of control
parameters
Text in the
program (see
part 4)
Color in the
program (see
part 4)
Signal wire is integrity
R
w
≤ 200 Ohm
OK
green
Breakage of the signal wire R
w
> 200 Ohm
breakage
red
Pipeline insulation is OK
R
ins
> 1 MOhm
normal 1
green
500 kOhm < R
ins
≤ 1 MOhm
normal 2
green
100 kOhm < R
ins
≤ 500 kOhm normal 3
green
50 kOhm < R
ins
≤ 100 kOhm
normal 4
green
5 kOhm < R
ins
≤ 50 kOhm
normal 5
green
Wet insulation (or signal
wire closed to metal pipe)
R
ins
≤ 5 kOhm
wet
yellow
When device finds out a defect from ‘red’ or ‘yellow’ zone, it forms an alarm packet and
if setting ‘Send data immediately’ is active then sends it in the NB-IoT network. If the setting