85
SAW sensor - Parameter
Type 8098
13.5.5
Activating the monitoring of the liquid temperature
If the temperature sensor is defective, the monitoring of the liquid temperature has no effect. In that
case:
The message
No temperature sensor detected
is displayed.
Because of a malfunction in the process, the measured liquid temperature value can be too high or too low.
A monitored value can be:
•
in the normal operating range
•
in the warning range
•
in the error range
You can set 4 limit values: 2 error limits and 2 warning limits.
→
To set the limit values, see chpt.
13.5.7 Changing the error limits, the warning limits and the hysteresis of
Figure 19 in chpt.
13.4.5 explains how the device reacts when the monitored value enters in another range
(for example, from the normal range into the warning range). The reaction time depends on the hysteresis
value and if the monitored value increases or decreases.
By default, the monitoring of the liquid temperature and the diagnostics are all disabled.
To activate the monitoring of the liquid temperature, do the following:
→
Select the device in the navigation area.
→
SAW sensor
→
Parameter
→
Stand. meas. values
→
Temperature
→
Limits
→
Active
→
Select
Yes
.
The monitoring of the liquid temperature is active and the device status will change depending on the
limits that have been set.
→
You can configure the behaviour of an analogue output depending on the status of the device. See chpt.
16.3.3 Configuring the behaviour of an analogue output depending on the status of the device.*
)
→
You can configure a digital output to switch every time a specific event is generated. See chpt.
Configuring a digital output as an on/off output.*
)
→
To enable the monitoring, i.e. to be informed when the value of the liquid temperature is outside the
normal range, enable the diagnostics. See chpt.
10.9 Activating the diagnostics functions.
*
)
Only variant with outputs.
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