Limited Adjustment Alarm Set Point; Active Current Interface; Inputs; Ev (Electric Clean Water Valve) - Deckma Hamburg OMD-2008 Series Instruction Manual

3.5.1 Limited Adjustment Alarm Set Point

By request units with alarm set point of 5 ppm max. are available. (For more information,
read section 18.
3.6

Active Current Interface

The active current interface represents a combination of measurements and
interpretations. The active current interface is adjustable to 0 to 20 mA or to 4 to 20 mA.
This complies the oil content from 0 to 30 ppm. In case of malfunction e.g. "EE" means
20 mA.
The output voltage is about 5 V and it is strongly recommended not to burden 150 Ω
external load.
3.7

Inputs

The unit also has four active inputs, which can be used separately as well.
a) Separator Input is dedicated to be used according the MEPC.107 (49).
b) Reserve Input reserved for future use.
c) Optionally there is an active input for external flow switch (FLOW). The Unit will
be in alarm condition, whenever Terminals are open/ disconnected. Normally this
input is delivered with a link.
d) An Input for fresh water switchover for units with an Electric Valve is available.
3.8

EV (Electric clean water Valve)

The OMD-2008 EV is designed with an Electric Switchover Valve to switch the instrument
from the sample stream to supply of clean, oil free water. Whenever fresh water is
allowed to flow to the Measuring Cell, the OMD-2008 EV will switch over to alarm
condition as required by MEPC.107(49), and it will also continue to display the
measurement result. The OMD-2008 EV setup replaces the manual valve setup for the
standard OMD-2008, and also allows remote flushing. After two minutes the fresh water
flush will switch back to sample stream.
3.9

FC (Flow Control)

OMD-2008 EVFC instruments are equipped with a Vortex Flow Sensor (For technical
information see Section Fehler! Verweisquelle konnte nicht gefunden werden.). The Unit
displays the flow rate. A flow rate between 0.7 l/min to 4.5 l/min can be measured. If the
flow rate through the Measuring Cell is below 0.7 l/min for more than 4 seconds, or if the
sample is not flowing at all, the Instrument will go to Alarm condition and issue a "Status:
Flow!" message. If a flow rate more than 0.7 l/min is achieved, the unit will be out of
alarm.
OMD-2008 Series with 5 ppm Alarm Set Point).
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