YSI IQ SensorNet 2020 XT Terminal - Manual (Page 13)

System 2020 XT USB Overview
1 - 7 ba76019e01 12/2012
1.2.4 Components of the system 2020 XT USB
Minimum configuration
(basic components)
The following basic components are required for a 2020 XT USB
system:
 An MIQ/TC 2020 XT, configured as controller
 A power supply module (e.g. MIQ/PS)
 At least one IQ sensor.
IQ sensors, main and
secondary measured
values
Sensors provide main measured values (e.g. pH, D. O. concentration,
turbidity value...) and additionally, depending on the type, secondary
measured values (e.g. temperature). In the System 2020 XT USB,
digital YSI single sensors and double sensors can be used:
 Single sensors provide a main measured value and normally a
secondary measured value (example: TriOxmatic 700 IQ
→
D. O. +
temperature).
 All active 0/4-20 mA inputs of the MIQ/IC2 input module rank among
the single sensors. Via a 0/4-20 mA input, any external instruments
can be connected to the IQ S
ENSOR N ET via their current output.
Each input provides a main measured value.
 Double sensors provide up to two main measured values and
normally a secondary measured value (example: VARiON 700 IQ
→
ammonium + nitrate + temperature).
Extension components The system can be adapted to fulfill different specifications by adding
further components, e.g. by:
 Terminals. They are the operation and communication units for the
IQ S ENSOR N ET . Available are:
– MIQ/TC 2020 XT for operation of the system from various
locations, e.g. calibration of IQ sensors on site (compatible
terminals, see section 1.4)
– MIQ/T2020 PC software terminals. The connection to the PC can
be established with the MIQ/IF232 interface module and the
RS 232 interface of the PC or a remote connection with a modem
(set for radio transmission, see chapter 10).
 Output modules with relay, current and valve outputs. Valve outputs
enable the time controlled, compressed air operated cleaning of the
sensor.
Each main measured value occupies a sensor location in the
IQ S
ENSOR N ET . A double sensor with two active main measured
values thus occupies two sensor locations. The available sensor
locations can be occupied by any single or double sensors.