mru SWG 100 biogas, Руководство пользователя

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MRU GmbH SWG 100 User Manual
Page 12 of 141
2.3. Possible applications and analyzer options
The biogas analyzer SWG100 is the industrial measuring solution to be used
with:
biogas (anaerobic digestion) plants
cogeneration heat and power engines (CHP)
municipal or industrial waste water treatment sites
coal seam gas sites (coal bed methane)
food and animal waste processing plants
biomethane (gas to grid) plants
landfill sites
This analyzer can be equipped with additional options and/or additional accessories to full fill
multiple other measuring tasks such as
CH
4
and CO
2
NDIR measurement
O
2
measurement with long-life EC cell
H
2
S
low
measurement with protected EC cell using cutoff solenoid valve and air
purge pump
H
2
S
high
measurement with EC cell
H
2
measurement with EC cell
CO measurement with EC cell
Electric gas cooler (Peltier) with automatic condensate draining pump
Multiple sampling point switchover from 2x up to a maximum of 10x sites
Module with 4 channel analog outputs/inputs 4-
relays
Converter module of RS485 into Profibus
Cabinet heater for freeze protection
Ask our sales representatives for available options and accessories or check out our MRU website.
2.4. Principle of operation
•
Sample gas from one or more sampling points is fed into the analyzer by dedicated ports.
Internally mounted electric valves select one point at a time to feed sample gas to the
analysis unit.
•
The instrument is equipped with a non-dispersive infrared (NDIR) bench for analysis of CO2
and
CH4
. Two separate infrared detectors for each
CO2
and
CH4
are included, each
operating with a different optical path length and stabilized by referring to a reference
detector. The IR source is a highly efficient and stable IR emitter, pulsed at a frequency of
several Hertz. By design NDIR technique offers good stability and selectivity together with
long life time of sensor (only limited by corrosion or dust, which can be prevented or
removed by regular servicing the instrument).
•
The instrument is optionally equipped with a number of electro-chemical sensors ECS in
order to detect gas components like oxygen
O2
or
H2S
. Those sensors offer a reliable and
effective way to detect the target gases. They are typically of limited life time (several years)
but may be easily replaced once the end-of-life is reached.
•
In regular time intervals the instrument automatically switches to purge the sensors with
fresh (ambient) air for re-adjust the zero point.