1. INTRODUCTION
IMPORTANT
Before operating the Instrument for the first time, ensure all the relevant installation
checks have been carried out [refer to Section 2.9].
1.1 About the Instrument
The MGA3000 Series Instrument is designed for bench or rack mounting and provides a
measurement of gas concentration according to specific user requirements.
Single, dual or triple gas versions are available utilising one or more IRGA optical benches
and/or chemical cells.
Most instruments incorporate IRGA benches that generate a signal proportional to the infrared
absorption of the measured gas. Providing the gas concentration lies within the designed range
of the instrument, the signal is periodically compared with reference gas (usually at zero and a
convenient mid-span condition). Calibration is achieved manually via simple front panel
controls.
Some instruments may include a chemical cell which reacts with the specific gas and which
provides an electrical output in proportion to the reaction.
Gas concentrations are indicated on a front display panel together with both analogue and
digital signal outputs.
Gas connections to and from the instrument are via suitable fittings on the rear panel. The gas
flow is maintained via an internal sample pump.
The MGA3000's electrical supply can be set at the rear panel to operate from a 110V, 220V or
240VAC mains supply.
1.2 Instrument Identification
Each Instrument is uniquely identified with a Serial Number. This is located on a label on the
rear panel alongside the Model Number for the particular Instrument.
Always quote the serial number and model number in any communications requiring
after sales support.
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