2.2
Silometer installation
There are three possibilities for installing Silometer transmitters:
•
Standard 19" rack with space for 12 7HP cards,
•
Field housing with space for up to 6 7HP cards,
•
Monorack housings for single transmitters.
Rack installation
A Racksyst system can be ordered fully wired, in which case the sensors and the external
power supply only need to be wired. Planning hints can be found in Publication
SD 041/00/e, »Racksyst Assembly Racks« .
For non-Racksyst installations and for installations including non-Racksyst cards, fill the
rack as follows (see also Fig. 2.1):
Rack arrangement
Step
Procedure
1
Allocate the power supply (NT 470) at the rightmost position.
-
If two NT 470s are used, install a 2 HP dummy panel between them.
2
Install non-intrinsically safe transmitters next to the power supply.
-
Install a 2 HP dummy panel between all foreign transmitters and between
Racksyst cards and foreign transmitters
3
Install intrinsically safe transmitters to the left of the rack.
-
Install foreign cards first.
-
Install dummy panels between all foreign transmitters and between Racksyst
cards and foreign transmitters in accordance with the instructions on the
Ex-Certificate.
-
No spacer is required between Racksyst cards.
Racksyst field housing
Instructions for installing Commutec transmitters in the Racksyst field housing with half
19" rack are to be found in Publication PI 003.
•
Check that the field housing is not installed in direct sunlight.
-
If appropriate fit a protective sun cover.
•
The maximum permissible ambient temperature for the field housing varies
b50
…
+60 °C according to the power consumption of the cards
(0
…
20 W)
BA119E09
Non-E+H
(Ex)i devices
E+H (Ex)i
devices
E+H devices
Non-E+H
devices
NT power
supply
Spacing between
non-E+H (Ex)i devices
as per certificate
2 HP dummy panel between
E+H and non-E+H devices
Fig. 2.1:
Recommended arrangement for
Racksyst rack assemblies
Chapter 2: Installation
Silometer FMX 570
9
