Introduction; Description And Use Of The Device - PRONOVA SSM 6000 User Manual

SSM 6000
CONT

1 Introduction

1.1

Description and use of the device

The SSM 6000 was specifically developed for analyzing biogenous process gases, such as biogas, sewage purification gas or
landfill gas. It is designed for the requirements of regular process control directly at plants and equipment and to this effect combines
quality sensor equipment for continuous gas analysis with multi-stage gas processing technology.
The full version is capable of analyzing the main gas types, i.e. methane, hydrogen sulphide, oxygen and carbon dioxide
respectively. The analyzer features ease of operation and a clear-cut display structure.
In terms of time and frequency of use, the SSM 6000 family can draw on the largest experience of all biogas analyzers available on
the market. The first analyzer developed in Europe specifically for continuous operation in biogas plants belongs to the SSM family
and has been in use since 1998. Several hundred SSM gas analyzers have been delivered up to now.
The demanding, strongly varying measuring conditions in biogas plants mean exacting requirements for gas analyzers for
continuous operation. Like in so many applications in biogas process technology, optimum adaptation to the difficult medium is the
decisive test. In order to increase service life, measuring precision and, above all, operational safety, Pronova has integrated a host
of additional functions into its SSM 6000 Classic which, in their totality, are quite unusual on the market:
Limitation of the maximum hydrogen sulphide concentration at the H
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classic)
Multi-stage measuring-gas processing, including measuring-gas cooling to 5°C for dehumidification sample gas (option)
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Pressure and temperature compensation of measured values
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Detonation protection EN 12874, housing rinsing in conjunction with the option measuring cooler
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Hydrogen sulphide is measured by means of electrochemical sensors. Already at typical gas concentrations in biogas plants,
sensors of this kind can be subject to saturation with a reduction of signals and increased sensor wear or even sensor failure. The
SSM 6000 Classic prevents this by microprocessor-controlled, concentration-dependent dilution of measuring gases which keeps the
H S gas concentration at the sensor at a level of below 25 ppm – even at levels of several 1000 ppm in the biogas. The sensor
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hence always works in its optimum load range.
Advantages: Wide measuring range of 0 – 5000 ppm without exposing the sensor to excessive load or strain
Increased long running stability
Lower operating costs thanks to extended service life
Increased reliability of the measurement
Biogas contains components which are harmful for the sensors and system components, in particular, hydrogen sulphide which has
an aggressive action in conjunction with humidity. The SSM 6000 Classic hence comes with a measuring-gas cooler in order to
reduce high humidity levels and protect the sensors. The SSM6000 LT analyzer version is available with an optional measuring-gas
cooler.
Advantage: Reduced susceptibility to failure
Lower operating costs thanks to extended service life
Avoidance of volumetric errors thanks to constant measuring-gas dew point
Precision infrared sensors (IR sensors) are used to measure methane (CH
values supplied by these sensors are strongly dependent on temperature and air pressure due to the underlying measuring process.
Changes in air pressure due to changing climatic conditions, for example, can already cause relative changes in measured values in
the order of up to 10%. Changes of a similar magnitude also occur if a device is calibrated, for example, in Berlin (40 m above mean
sea level) and operated at an altitude of 600 m above mean sea level. With the SSM 6000, IR measurements are generally
subjected to temperature and pressure compensation.
Advantage: Increased measuring precision.
800C-07.07.EN
S sensor(equipment specification is SSM6000
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) and carbon dioxide (CO
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SSM 6000C User Manual
INTRODUCTION
). However, the measured
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