LANDTEC BG3K2, Operating Manual, Page: 24 / 181

24 Operating Manual
BIOGAS 3000 Overview
OMBG3000 – Iss.01 © Copyright 2016

The module has a minimum three-minute air purge every 24-hours. The
duration and time of day this occurs is user-definable.

The external sensor has user selectable sample intervals that are
exhausted back to the process. The external sensor cannot be subjected
to the gas stream continuously.

After each defined cycle, the external sensor is subjected to a user
definable air purge that is exhausted to the atmosphere.

The 4-20mA and Modbus outputs are updated continuously, with the
external sensor data being refreshed at the end of each sample

The following images are two simple block diagrams of the system with
one including the optional external gas sensor:
BG3KE with no external sensor
BG3KE with an external sensor