LANDTEC BG3K2, Operating Manual, Page: 22 / 181

22 Operating Manual
BIOGAS 3000 Overview
OMBG3000 – Iss.01 © Copyright 2016
Warning For this option, additional moisture filtration will be
required external to the equipment on ‘Sample Gas 1’.
BG3K4
3.5.4

The BG3K4 measures CH
4
, CO
2
, and O
2
as standard with a choice of up
to two additional gases (one internal to the module and one external)
from four sample points.

It has user selectable sample and air purge intervals that are exhausted
back to the process and atmosphere respectively.

The 4-20mA and Modbus outputs are updated at the end of each
sample.

The following image is a simple block diagram of the system including
the optional external gas sensor:

The BG3K4 also has the option of measuring from the hydrolysis tank on
sample point 1 and not passing this gas across the external sensor. This
prolongs the life of the sensor. The following image is a block diagram if
the system with this option selected: