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Table 10: Alarm thresholds after Auto Setup
Response mode
ALERT threshold
ALARM threshold
FAST
3× baseline level
10× baseline level
MEDIUM
5× baseline level
20× baseline level
SLOW
5× baseline level
20× baseline level
The baseline of the previous Auto Setup is always stored in the device memory. When you change the
response mode, the device applies the appropriate multipliers to the baseline, and adjusts the
parameters for ALARM and ALERT thresholds automatically.
The response mode can be changed using a mode selector key on the main board, or an optional
magnetic switch on the front panel. It is not possible to change the response mode in DustTool. Instead,
you can use DustTool to change individual parameters.
Changing the response mode overwrites any previously made parameter changes.
For more detailed information about device parameters, see section
8.1.3
Operation statuses
Table 11 shows the default signal levels for each operation status after Auto Setup:
Table 11: Default signal levels after Auto Setup
Status
Output signal
Description
Normal:
4 ... 20 mA
Normal operation range
No dust present:
4 mA
Minimum value during normal operation
Measurement baseline:
4.8 mA
5% of signal range
ALERT:
≥
8 mA
•
3× or 5× increase in dust
concentration*
•
25% of signal range
•
Relay 1 switches position
ALARM:
20 mA
•
10× or 20× increase in dust
concentration*
•
100% of signal range
•
Relay 2 switches position
* Multiplier is applied based on the selected response mode.
For further information on operation statuses and relay logic, see section
in chapter
Figure 27 further illustrates the relation between Auto Setup baseline and the alarm thresholds:
