DRAFT - 20 November 2014
DRAFT - 20 November 2014
5
INM 660 rev 14
4 INSTALLATION
4 .1 General directions
Take careful notice of the “Safety rules, instructions and
precautionary measures“ at the front of this manual.
4 .2 Installation / surrounding conditions
Take the relevant IP classification of the casing into account (see
manufacturer’s plate). Even an IP67 (NEMA 4X) casing should
NEVER be exposed to strongly varying (weather) conditions.
The panel-mounted models, MTL662 and MTL665 are rated IP65
and IP66/67 respectively. The field mounted models MTL661 and
MTL663 are rated IP67.
When used in very cold surroundings or varying climatic conditions,
take the necessary precautions against moisture by placing a dry
sachet of silica gel, for example, inside the instrument case.
Mount the MTL661/2/3/5 on a solid structure to avoid vibrations.
4 .3 Enclosure Dimensions
For dimensions of the enclosures and any panel mounting cutouts
see Section 8.
4 .4 Hardware and connections
4 .4 .1 Mounting the MTL661(B) & MTL663(B)
Two 8mm diameter holes (see Section 8) are provided through the
side flanges to assist with the mounting of the indicator. See also
Section 4.5 for details of wall and pipe mounting the MTL661(B).
4 .4 .2 Mounting the MTL662(B) & MTL665(B)
Cut an aperture in the panel to suit the model, as shown in the
Case Details in Section 8 of this manual, and use the hardware
provided with the display to secure it to the panel.
4 .4 .3 Mounting the MTL66x-NA
When used in type of protection ‘non sparking’, the enclosure shall
be installed in such a way that the risk of mechanical damage is
low.
WHEN INSTALLING, PAY SPECIFIC ATTENTION TO:
The use of separate cable glands, with effective IP67
(NEMA4X) seals, for all wires, to maintain the
enclosure rating.
The use of IP67 (NEMA4X) plugs for all unused cable
entries: to maintain the enclosure rating.
Cable shields may be connected together, using terminals
2 and 3, to maintain shield continuity.
4 .4 .4 Terminal connectors
The following screw-clamp terminal connectors are provided:
Minimum wire size 0.2mm
2
, maximum 2.5mm
2
Figure 8
- MTL661/2/3/5 terminal connectors showing standard
configuration and backlight options .
Figure 9
- Typical connections when using IS isolators (including backlight)
