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AMI Silica
Program List and Explanations
87
5.2.4.2
Current Loop:
Select the current range of the signal output.
Make sure the connected device works with the same current range.
Available ranges: 0–20 mA or 4–20 mA
5.2.4.3
Scaling:
Define the scaling of the signal output used to transmit a
process value. Available functions are:
Linear, bilinear or logarithmic for process values.
See
5.3 Relay Contacts
5.3.1
Alarm Relay:
The alarm relay is used as cumulative error indicator.
Under normal operating conditions the contact is active.
The contact is
inactive at:
Power loss
Detection of system faults like defective sensors or electronic
parts
High case temperature
Lack of reagents
Process values out of programmed ranges.
Program alarm levels, hysteresis values and delay times for the fol
-
lowing parameters:
Alarm Si 1
Sample Temp.
Sample Flow
Case Temp. high
Case Temp. low
5.3.1.1
Alarm Si 1
5.3.1.1.1
Alarm High:
If the measured value rises above the alarm high value,
the alarm relay is activated and E001 (E003), is displayed in the
message list.
Range: 0.00 ppb –5.00 ppm
5.3.1.1.25
Alarm Low:
If the measured value falls below the alarm low value,
the alarm relay is activated and E002 (E004) is displayed in the mes
-
sage list.
Range: 0.00 ppb –5.00 ppm
5.3.1.1.35
Hysteresis:
Within the hyst. range, the relay does not switch. This
prevents damage of relays contacts when the measured value fluctu
-
ates around the alarm value.
Range. 0.00 ppb –5.00 ppm