West Control Solutions CI 45 - Manual (Page 23)

6.4 Filter
A 1st order mathematical filter with adjustable time constant and bandwidth is built in.
The filter bandwidth b.Fx is the adjustable tolerance around the measured value within which the filter is active.
Measurement value changes in excess of the adjusted bandwidth are not filtered.
6.5 Substitue value for inputs
If a substitute value for an input is activated, this value is used for further calculation with a sensor fault, independent
of the selected input function. The selected controller output reaction on sensor fault, configuration FAIL, is omitted.
With factory setting, the substitute value is switched off.
a
Before activation of a substitute value In.F, the effect on the control loop must be considered.
6.6 Input forcing
Setting f.AIx = 1 (only via BlueControl
®
) can be used for configuring the input for value entry via the interface
(=forcing).
a
Please, check the effect on the control loop in case of failure of input value / communication and
exceeded measuring range.
6.7 O
2
measurement (optional)
This function is available only on instrument versions with INP2 .
Lambda probes (
l probes) are used as input signals. The electromotive force (in volt) delivered by lambda probes is
dependent on the instantaneous oxygen content and on the temperature. Therefore, transmitter CI 45 can only display
accurate measurement results, if the probe temperature is known.
Distinction of heated and non-heated lambda probes is made.
Signals from both types can be handled by CI 45.
Heated lambda probes
Heated
l probes are fitted with a controlled heating, which ensures a continuous temperature. This temperature must
be specified in parameter Probe temperature in transmitter CI 45.
Parameters
® Functions ® Pro be temperature tEmP ® ...°C (/°F/K - dependent on configuration)
Non-heated lambda probes
When the probe is always operated at a fixed, known temperature, the procedure is as with a heated probe.
- preliminary - Functions
UNIFLEX CI 45 Filter 23
b.F
x
t
Output
Input