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In this mode also the individual adjustment of the time delays for the alarms can
be done.
Both alarm circuits are also related to an alarm LED on the front panel.
In case of malfunction the "System" LED will indicate any type of internal fault of
the unit. This LED is flashing green in normal conditions and is red in alarm
conditions.
Additional to the alarm LEDs each alarm circuit is equipped with a relay with
potential free alarm contacts. These contacts can be used for external processing
of the signal or for control of further functions.
If a malfunction or failure of the power supply occurs, all three relays (both alarm
relays and the SYSTEMFAULT relay) will switch to alarm condition.
3.5
FC (Flow Control)
OMD-2008 EV-FC instruments are equipped with a Flow Sensor. The Flow
Sensor is connected in the Drain line of the Measuring Cell. If the flow rate
through the Measuring Cell is too low, or if the sample is not flowing at all, the
Instrument will go to Alarm condition and issue a "Status: Flow?" message.
3.6
EV (Electric clean water Valve)
OMD-2008 EV instruments are equipped with an electric switchover valve for the
clean water stream. The valve can be controlled via the menues, or remotely
using the control input.
3.7
MCU (Manual Cleaning Unit)
Optionally the instruments can be fitted with a Manual Cleaning Unit. The Manual
Cleaning Unit allows to clean the sample glass tube without opening the
Measuring Cell Head Screw, and without interrupting the normal sample flow.
Maintenance is made easier with the MCU. Please note that operating the MCU
may set the instrument to alarm condition for a few seconds.
Issue: 08.07.2015
DECKMA HAMBURG GmbH
Instruction Manual OMD-2008 (EV, FC, MCU Versions)
Page 5 of 28
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