Subject to change · V 2.02.20 · EN
Page 25
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11.3.1.2 Filter mode
For each measured ordinal number (OL) a separate limit value can be set. If one size class shall not be considered the smallest value
must be set. The alarm is activated as soon as a measured cleanliness class has reached or has fallen below the set limit value.
Standard Adjustment range Value for deactivation Alarm condition
ISO 4406:17 0, 1, 2... 28 0 OZ 4 µm ≥ limit value OR
OZ 6 µm ≥ limit value OR
OZ 14 µm ≥ limit value OR
OZ 21µm ≥ limit value
SAE AS 4059E 000, 00, 0, 1, 2...12 000
NAS 1638 00, 0, 1, 2...12 00
OZ ≥ limit value
GOST 17216 00, 0, 1, 2...17 00
11.3.1.3 Temperature alarm
Only available from software version 2.00.15.
Here, a limit value for the temperature can be set. The temperature alarm is active when the limit value has been reached or
exceeded. To deactivate the alarm, the limit value has to be set to “00”.
The measured temperature does not directly correspond to the temperature of the oil.
Adjustment range: 00...85 (00=deactivated)
11.3.2 Alarm memory
There are two possibilities to remove a signalized alarm. The setting can be made in the menu.
1. Automatic off
If the conditions for an alarm are not fulfilled anymore, the alarm is removed automatically.
2. Conrm
The alarm continues to be displayed, even if the conditions for an alarm are no longer met. It will continue to be displayed until it
is removed manually.
The alarm can be removed by pressing the UP [] and DOWN [] button simultaneously.
11.3.3 Low-pass filter
In a hydraulic system short-term increases in concentration (peaks) may arise, which are not representative for the overall system, e.g.
by operating a manual valve. The OPCom detects these changes and displays them correctly.
The low-pass filter ensures that when an alarm is set according to chapter 12.3.1.1 and 12.3.1.2, it is not triggered at each peak.
The relevant particle concentration for the alarm is smoothed internally and an alarm is only issued at a sustained change in measu-
rement. The output and display of the measured values are not affected by the filtering.
› At a volume flow of 0 ml/min or an ISO class of 0 at 4 µm, the filter function is automatically deactivated.
› Adjustment range: 1…255 (1=deactivated)
› Factory setting: 2
› Recommended value: ≤10
The following diagram shows a step response for various values of the low-pass filter. The table shows how many measurements
have to be carried out, so that the internal concentration for alarm evaluation reaches 90% of the actual measured concentration.
Table 12: Alarm configuration filter mode
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