Remote Power Supply Box - mru SWG100 BIOEX User Manual

General menu: Menu-
point to set the LEL Level
Self test of the CH4/CO2 NDIR- bench
The CH4/CO2 NDIR-bench being a part of the SWG100BIO-EX protection system, is required
to be monitoring itself. In case the bench is supposed to be not working correctly, the alarm
output is activated as well, which will lead to a power down of the instrument.
This self test is performed regularly and intrinsically by the biogas sample gas measurement
itself. The analyser detects the CH4 concentration on all installed sample gas inlets. If the CH4
concentrations of all inlets are below 5 Vol.%, the alarm is triggered. The user has the
possibility to manually delay the power-down in 1 hour intervals (max. 24 hours), in case the
missing CH4 is known to be due to the sample gas composition. Do not delay the alarm if there
is any doubt on the NDIR bench's performance. The alarm is still active, the user will see a
flashing red 'OFF' on the menu indication bar.
In case the user needs to pause the self test supervision for a limited time interval, this can be
done for a couple of hours (min.2:00:00 max.24:00:00) in order to prevent a switch-off alarm. To
pause the function, select to the path:
appear. With F3 the supervision function can be switched off and on. In the screen a countdown
appears. This countdown shows when the paused CH4 sensor supervision will restart. With the
right/ left arrow keys the countdown can be set up until 24 hours.
After power-on the CH4 sensor supervision will start as soon as all sample gas inlets have been
measured once and not earlier than 1 hour operation.
15.4.
When the SWG100BIO-EX outputs an alarm (due to internal CH4 detected or due to failed self
test) it is required to switch off the instrument completely by means of an external power supply
box, which shall be located in safe area, in the power supply distribution cabinet.
24 / 108
•
Switch off alarm. The user has 2 minutes
before the SWG100BIO-Ex power down.

Remote Power Supply Box

SWG100 BIOGAS User Manual
E / CH4
XTRAS SENSOR SUPERVISION
Screen after a delay was added
. The following menu will
Right / left arrow keys
to set the
countdown up or down.
MRU GmbH, D-74172 Neckarsulm