Product Description And Accessories; General Description - Grundfos Conex DIA-G Montage- Und Betriebsanleitung

7. Product description and
accessories
This universal device offers high-precision
measuring of chlorine, chlorine dioxide, ozone,
ammonia or hydrochloric acid.
• comprehensive limit value functions
• comprehensive alarm functions
• logbook function: chronological recording of key
events with date and time
• user coding function as a means of protection
against access by unauthorised persons and for
system administration
• error message function for indication of
non-functioning sensors
• automatic monitoring of the sensor service life
with warnings about sensors that require
renewal.

7.1 General description

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The Conex DIA-G is a gas warning controller for
monitoring gas concentrations, for example in
storage or dosing rooms. With a maximum of two
independently connected sensors, the gas
concentration of chlorine, ozone, chlorine dioxide,
hydrochloric acid or ammonia can be displayed and
monitored. Amperometric sensors (sensor discs) can
be connected directly to the Conex
potentiostatic sensors can be connected to a
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preceding Conex DIA-G sensor interface.
Each of the two sensors is provided with electrically
isolated current outputs (potential-free to power
supply) to output the measured concentration, two
electrically isolated limit value transmitters and an
alarm relay to control the warning and safety
equipment.
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The Conex DIA-G meets the high safety
requirements through permanent sensor monitoring,
alarm relays and optional backup mode (connection
of an external backup battery for supplying power to
®
the Conex DIA-G in case of short-term power
supply interruptions).
How the system operates
• The gas sensors generate a current which is
proportional to the gas concentration in the air.
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• The Conex DIA-G gas warning controller
– amplifies the sensor current
– triggers an initial warning, for example when
the first limit value is exceeded
– activates the relevant warning and safety
equipment when the second limit value is
exceeded
– outputs the measured concentration at both
sensors as a 0 (4) - 20 mA signal via the
current outputs (for example for recording).
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DIA-G, and
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