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2 INTRODUCTION
2.1 Classification
According to EN61010-1, AW400 is classified an:
• electrical equipment for measurement and test
• electrical equipment for process control
• electrical equipment designed to be safe at least in the following conditions:
– altitude lower than 2000 m
– operation temperature limits -10 to + 50 °C
– storage temperature limits -40 to + 65 °C
– maximum relative humidity: 80 % with temperature up to 31 °C, with linear decrease down to 50%
with temperature 40 °C
– supply voltage allowed variations: 115 or 230 V ac ± 10 %
– over voltage class (installation class): II
– pollution degree: 2
2.2 Glossary
PARAMETER SYMBOL
pH pH
ORP (oxidation reduction potential) mV
Dissolved Oxygen* O2
Residual Chlorine Cl
Chlorine Dioxide CD
Ozone O3
Temperature T
These symbols are also used in displayed indications.
* Not supported at this time.
2.3 General Description
AW400 Monitor/Controller Family includes 2 Types of instrument:
• Transmitter (Instrument Type 1)
A group of transmitters, both single channel and dual channels and three channels.
• Controller (Instrument Type 2)
PID controller for the installed Sensor, with specific algorithms for each type of measured parameter. It can
accept an optional 4–20 mA signal from a flow-meter on channel 2. This second input can be used as Feed
Forward input in the PID algorithm.
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