4 Technical Description
43
4.13 Limit values
Measurement data can be monitored with the aid of the limit values. The LT 2/KS1-DK
is equipped as standard with four fixed limit values, which can be freely configured.
Limit values (factory setting)
• Limit value 1: > 400ppm exceeds COe limit
• Limit value 2: Disabled
• Limit value 3: Disabled
• Limit value 4: < -5 mV probe voltage below threshold,
3 seconds trigger delay
Reset mode “automatic”,
(for monitoring the probe; air value)
Monitoring is effected by comparing the reference value with a lower comparative
value (Min. comparative value) or with an upper comparative value (Max. comparative
value).
If the reference value that you wish to monitor is outside the range (window), this
indicates that the reference value is lower than the Min. comparative value or higher
than the Max. comparative value, and so the limit value output is enabled.
Parameters 910 to 914 indicate whether the limit value is enabled.
The relay outputs of the LT 2KS1-DK lambda transmitter can be switched with the aid
of limit values 1 - 4. The necessary settings are explained in section 4.13.7. “Digital
outputs”. Here, we go on to describe the configuration, display and resetting of limit
values. If the display is used, these points can be found in the limit value configuration
or limit values parameter groups.
Seven parameters are available for each of the four limit values (e.g. for limit value 1):
1. LV 1 affects:
2. Max. comparative value
3. Min. comparative value
4. Max. LV const.
5. Min. LV const.
6. Reset mode
7. Trigger delay
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