YSI IQ SensorNet 2020 XT Terminal - Manual (Page 33)

System 2020 XT USB Installation
3 - 3 ba76019e01 12/2012
3.4 Basic requirements for optimum installation
3.4.1 General information
The IQ S ENSOR N ET supplies all components with low voltage as well
as digital communication via a shielded 2-wire line.
Due to this characteristic, the following factors must be taken into
account in the planning of an IQ S
ENSOR N ET system:
 Power consumption of all components (power rating). Primarily, this
determines the number of power supply modules required (section
3.4.2).
 Distance of the components from one another. Large distances may
require a further MIQ/PS power supply module and/or an MIQ/JBR
signal amplifier module (section 3.4.3).
 Placement of the MIQ/PS power supply modules in the
IQ S ENSOR N ET (effect on the power supply - section 3.4.3).
Caution
Only IQ S ENSOR N ET products may be used in the IQ S ENSOR N ET .
3.4.2 Drawing up the power rating
Power rating - why? All components in the system require a specific level of electrical power
for operation. Thus, it is necessary to draw up a power rating after
selecting all the components. At the same time, this can determine
whether the entire power requirement of all components (consumers)
is covered by the existing MIQ power supply modules. If this is not the
case, the power available in the system must be increased by further
MIQ power supply modules.
Note
The power rating provides an initial guide value. In specific limiting
cases, the power supply may be insufficient despite the positive power
rating. Long cable lines, for example, result in additional power losses
that may have to be compensated by further MIQ power supply
modules. This can be checked for the planned installation by following
section 3.4.3.
The total power requirement P of all consumers can be determined
from the following table: