INM MTL 130-0202 Rev 4
5
3
INSTALLATION
WARNING
The weight of this equipment is in excess of 18kg, and the use of mechanical
handling equipment or assistance from additional personnel is recommended
when handling and mounting.
3.1 Unpacking and visual checking
Take all standard precautions when opening packages. In particular avoid the use of long bladed
cutters. Search packing before discarding it and make sure that all of the components are
removed. Check that all pipe connections have captive seal nuts.
3.2 Mounting
The analyser is supplied as two separate parts – the panel mounting katharometer/reactor
assembly and the control electronics in its own environmental enclosure. The enclosure is un-
drilled but is supplied with suitable cable glands. The user may therefore choose the cabling
arrangement and drill holes in the enclosure to suit the application.
3.3 Electrical connections
Terminal blocks are provided in the lower part of the enclosure. See diagrams and labels for
details.
WARNING
This instrument must be installed with a disconnecting switch close to it,
within easy reach of the operator and compliant with the relevant parts of IEC
60947-1 and IEC 60947-3. It must be marked to indicate this function and
show ON and OFF positions. Wiring should conform to local codes.
Only the live conductor has an internal equipment fuse. European regulations
recommend that fuses be fitted in both the live and neutral of the mains
supply to the instrument.
NOTE
The Relay operation and labelling ‘Normal’ relate to “process normal” and not the electrical
rest position of the relays, In process normal the relays are energised.
3.4 Installation requirements for EMC
To ensure compliance with the European EMC directive certain installation precautions are
necessary as follows:
3.4.1 Routing of wires
To minimise the pick-up of electrical noise all signal wiring should be shielded and routed away
from power cables and sources of strong magnetic fields.
3.5 Sample conditioning
It is essential that the sample is dried to a water dew point of –10°C (14°F) or lower because
water will react to some extent with the chlorine as the sample passes through the reactor.
The reaction produces oxygen and hydrogen chloride and the effect of the oxygen appearing
in second measurement sensor causes the hydrogen value to be reported lower than its true
value. This is a slow reaction and its extent is dependent upon the sample flow rate and the
reactor temperature.
