2. INSTALLATION
2.1 Installation Arrangement
The basic arrangement of the Instrument is a ‘3U’ high, 483mm (19”) chassis for rack
mounting, or alternatively, it may be supplied with a case for bench mounting.
All power input, output and gas connections are via the rear panel.
Power connection is via a standard three-way IEC power plug. A suitable plug and cable is
supplied.
Gas connection details are indicated in Section 2.7.
RS232C, analogue and alarm contact outputs are detailed in sections 2.4, 2.5 and 2.6
respectively.
2.2 Location & Ambient Conditions
The location must provide firm support and access to the rear of the instrument when the
instrument is mounted in the normal attitude on its base. When installed in a rack, the use of
runners is recommended.
It is not necessary to force ventilate the enclosure to cool the unit, but free circulation of air is
necessary for accuracy and reliability.
Although it is not necessary to maintain a controlled environment during use, a reasonably
stable ambient temperature gives best results. Sudden changes in temperature will disturb the
IRGA bench(s), causing a shift in readings until the compensation recovers. If a drop in
temperature is expected, it is best to leave the instrument energised (switched 'ON'), to avoid
possible condensation of water in the optical bench. If not being used in this condition, it is also
better to switch off the sample pump as this not only prolongs the life of the pump, but helps to
reduce condensation.
In all cases the ambient conditions must comply with the specifications. High
ambient conditions will affect reliability.
IMPORTANT: The MGA series analysers are not certified for operation in hazardous
environments.
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