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12. Operator Maintenance
(See Section 2. Important Notes).
WEEKLY INTERVALS: 12.1 to 12.6 Data Logger Checking
MONTHLY INTERVALS: 12.7 MCU and Automatic Cell Cleaning Device
The Operator Maintenance should be scheduled at least once a week. If needed, prepare
the Quick Check List to keep track on maintenance. For more information, see section
23.1 Operator Maintenance Quick Checklist.
12.1 General Test
a) Visually inspect instrument for obvious leakages or damage.
b) Visually check condition of cables and connections.
c) Check the desiccator:
- Press “SYS” button, select Measuring Cell, confirm.
- Internal data is displayed. Identify Dew Point Temperature [°C] and relative
humidity [%rH] data.
The relative humidity [%rH] should be below 10%rH. Dew Point Temperature should
be below 0°C. If not, desiccator exchange is recommended. The desiccator also has to
be exchanged, if the humidity is higher 40%rH. For more information, see section
21.2.4 Functional Button “SYS”.
12.2 Normal Operation
d) Switch the EV Valve or manual valve to fresh water, so that the cell is flushed with oil
free water. Check 21.2.2 Functional Button “ON”.
i
When operated via the front panel the EV-Valve will automatically switch back to
normal operation (sample stream measurement) after approximately 120 seconds of
clean water flushing.
For operating the Electric FW Valve press the “ON” button, select “FW FLUSH” change
the Status to “ON”. The EV-Valve will switch over to fresh water immediately, and
remain in fresh water setting for 2 minutes before switching back to normal operation.
If a prolonged flushing is desired, it can be retriggered within the 2 minutes, or
repeated afterwards.
Anytime the EV-Valve is switched to fresh water, the OMD-24 will be in alarm
condition, as required by IMO MEPC.107(49). If the instrument is switched on to FW
remotely, it will remain so until the remote signal is changing.
e) Let the oil free water flow for few minutes.
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